JPH0325342B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to an automatic bead insertion device, and more specifically, to an automatic bead insertion device that reduces labor and improves productivity, and at the same time improves worker safety. This invention relates to an automatic bead insertion device.

[Prior art]

Conventionally, when inserting a bead in this type of tire building machine, an operator manually inserted the bead into the bead setting ring of the tire building machine.

In addition, various other bead holder devices have been proposed, but some involve simple bare beads without a bead filler or bead cover.
Also, there were many items related to large hexagonal beads and round beads.

For example, as shown in FIGS. 12a and 12b, in the parallel bead press-fitting method, when the bead is inserted in the direction of arrow F, the bead cover lap portion of the bead body B and the bead cover b are exposed to the bead setting ring A. In areas where the bead cover is not attached tightly, as shown in the figure, the bead cover b will deform and get caught, making it impossible to insert it completely. There was also a risk of A falling off, which was a drawback that hindered automatic tire molding.

[Purpose of the invention]

This invention was devised by paying attention to such conventional problems, and its purpose is to reduce labor and improve productivity by automatically inserting bead rings, and in particular to reduce labor and improve productivity. As for the side, since the bead is set by passing through the forming drum, even if the automatic step is advanced by mistake, it is possible to prevent the worker from getting his or her fingers caught between the bead and the drum. Furthermore, the present invention provides an automatic bead insertion device that can easily insert the bead even when the bead is deformed or the bead cover has a lapped portion and the inner diameter is uneven.

[Structure of the invention]

In order to achieve the above-mentioned object, the present invention installs a forward/backward movement mechanism movable in parallel with the main shaft of a tire forming device on the tail stock stand side, connects a base ring to the tip of this forward/backward movement mechanism, and connects the base ring to the tip of this movement mechanism. The base ring is configured to be able to advance and retreat toward the bead setting ring while remaining parallel to a plane orthogonal to the main axis, and a bead insertion unit and a bead insertion unit are disposed on both sides of the base ring in the circumferential direction on the surface side of the base ring. A plurality of bead insertion unit mechanisms each consisting of a pair of bead holder units are arranged at predetermined intervals, and the pair of bead holder units are swingably supported by a base ring and It is composed of an L-shaped bead holder arm that supports the inner surface of the bead, and a cylinder that swings and drives the bead holder arm that is attached to the base ring, and the bead insertion unit is swingably attached to the base ring. an L-shaped insertion arm that is supported and whose tip can come into contact with the side surface of the bead supplied to the bead holder arm; and a cylinder that is attached to the base ring and that drives the tip of the arm to swing. The gist of the present invention is that the arm is configured to automatically insert the bead into the bead setting ring while pushing the bead outward from the inner center.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 shows a side view of a tire forming apparatus 10 embodying the present invention. In this tire forming apparatus 10, reference numeral 11 indicates a tail stock stand disposed slidably in the axial direction, and reference numeral 12 indicates a tail stock stand. The outer case 12 is attached to the main shaft 13 on the 11 side, and a bead setting ring 14 is attached to the side surface of the outer case 12. Further, 15 is a headstock arranged in the same axial direction as the main shaft 13, 16 is an outer case attached to the main shaft 17 on the headstock side, and a bead setting ring is attached to the side surface of the outer case 16 on the tail stock stand 11 side. 18 is installed. 19 is the main shaft 20 on the headstock side.
shows an expandable molding drum installed in the

An automatic bead insertion unit 30 according to the present invention is installed on the tail stock stand 11.

This automatic bead insertion unit 30 includes a turning mechanism 60 that rotates the base ring 31, and a forward/backward movement mechanism 7 that moves the automatic bead insertion unit 30 forward and backward.
0, and the forward/backward movement mechanism 70 is installed on a base plate 71 on the tail stock stand 11.

The back surface of the base ring 31 has two arms 32a, 32b and two frames 33a, 33.
b, and four pins 34a, 34b, 34c, and 34d that rotatably connect these parts.

In the rotating mechanism 60, a support arm 61 is attached to the frame 32b, and an output rod 64 of a cylinder 63 is connected to the support arm 61 via a pin 62. Further, this cylinder 63 is supported via an arm 65 by an arm 33b that constitutes the four-section parallel link mechanism.

On the other hand, in the advancing/retracting mechanism 70, a cylinder 72 is installed on the base plate 71, and a rod of the cylinder 72 is connected to a slide shaft 73 connected to the arm 33b. Slide shaft 73
are installed parallel to the cylinder 72 and are slidably supported by bearings 74a and 74b installed on the base plate 71.

Next, as shown in FIGS. 2 and 3, the base ring 31 of the automatic bead insertion unit 30 has a bead insertion unit 32 and a pair of bead holder units 33a, 33 sandwiching it therebetween.
Bead holder unit mechanism 3 consisting of b.
A plurality of (8 in this embodiment) 4 are arranged.

Note that in this embodiment, the bead insertion unit 32
bead holder units 33 adjacent to both sides of the
a and 33b, but this is not particularly limited.

Further, in this embodiment, the base ring 31 includes a divided base ring 31a and a divided base ring 31b.
A metal fitting 35a is attached to the divided base ring 31a, and a metal fitting 35b is attached to the divided base ring 31b.
The metal fitting 35a and the metal fitting 35b are swingably connected via a shaft 36, and a pin 37 is attached to the metal fitting 35a.
A cylinder 38 is swingably attached to the output rod 38a, and a bracket 39 is attached to the tip of the output rod 38a, and a metal fitting 35 is attached via a pin 40.
connected to b.

As a result, the base ring 31 can be opened and closed by the divided base ring 31a and the divided base ring 31b by the cylinder 38 around the shaft 36, and the tip part 13 of the divided base ring 31a
1a and the distal end portion 131b of the split base ring 31 are properly aligned with each other by a suitable guide (for example, a spigot).

Note that, depending on the order of operation described later, it is not necessarily necessary to divide the parts.

FIG. 3 shows an enlarged view of the main parts of the automatic bead insertion device unit 30, 18 is a bead setting ring on the tire molding machine side, B is a bead (ring) to be held, and B ₁ is a profile called a bead filler. Rubber strip with B ₂
is a corded rubber sheet called a bead cover, and B ₃ is a bead wire section made of piano wire or the like.

41 is the pair of bead insertion units 33
a, 33b, this bead (ring) holder arm 42 is fixed to the base ring 31,
It is swingably attached to the base ring 31 by a bracket 44 via a pin 43. Further, 45 indicates a push bolt for positioning the bead (ring) holder arm 41, and 46 indicates a compression spring for "closing" the bead (ring) holder arm 41.

47 indicates a cylinder for "opening" the bead (ring) holder arm 41, and this output rod 47
a is in contact with the arm base 42. With these, the bead (ring) holder arm 41
does not become larger than a preset dimension with respect to the inner diameter dimension of bead B, but by selecting the output of the cylinder 47, if a force exceeding a certain force toward the center is applied, it will oscillate toward the center. It is designed to be able to move, or in other words, become ``closed''.

Also, when the output of the cylinder 47 is removed, the compression spring 4
Due to the elastic force of 6, the tip of the bead (ring) holder arm 41 swings toward the center, and is affected by deformation of the bead B when receiving the bead B from an appropriate supply device (shown in the figure). Not only can the bead B be reliably received, but also the deformation of the bead B can be corrected by the output of the cylinder 47 after being received.

Next, FIGS. 4 and 5 show a side view and a front view of the bead insertion unit 32, and the cylinder 4.
8 is fixed to a base ring 31, a base plate 49 is attached to this cylinder 48, and arms 50a and 50b are symmetrically projecting from the upper part of the base plate 49.

A pin 51 is swingably attached to the arms 50a, 50b via a bearing or the like, and an L-shaped insertion arm 52 is attached to the pin 51.

A space is provided in the L-shaped arm 52 at an appropriate position closer to the center than the pin 51, and a bearing 54 is rotatably attached to the L-shaped arm 52 via a pin 53. The output rod 48a of the cylinder 48 passes through this bearing 54 and the base plate 49.
The tips of the two are in contact.

The insertion arm 52 is L-shaped in this embodiment, and its tip 52a is a bead (ring).
It is designed to come into contact with the side surface of the bead B supplied to the holder arm 41, and has a suitable profile on the lower surface on the center side to prevent scratches etc. when inserting the bead B with the arm 52. are doing.

Further, a tension spring 57 is attached to the rear lower end of the arm 52 via a pin 55 and a bolt 56.

With the above combination, when air pressure etc. are supplied to the cylinder 48, the output rod 48a pushes the bearing 54, but since the position of the pin 51 is fixed, the arm 52 swings around the pin 51. ,
The tip 52a moves to push in while pulling up the side surface of the bead B obliquely above the center side, as shown in FIG.

Next, the operation and operation when inserting the bead will be explained.

FIG. 7a shows that the bead insertion unit 32 is activated and the insertion arm 52 is used to insert the bead B on the upper side.
When the bead holder arm 41 on the opposite side (lower side) is inserted into the bead setting ring 18,
The figure shows the case where the curve escapes toward the center.

In FIG. 7b, assuming that each of the bead insertion units 32 is P, X ₁ , X ₂ , _{Y 1} , Y 2 , Z ₁ , Z ₂ , Q, the insertion operation is (P)→(X ₁ X ₂ ) →
(Y ₁ , Y ₂ ) → (Z ₁ , Z ₂ ) → (Q)), the upper part of the bead (ring) B first becomes the bead setting ring due to the operation shown in Fig. 7a. 18, and then the beads B are inserted one after another according to the order of operation. However, once the bead part is inserted into the bead setting ring 18, it cannot come off or escape, so the operation of the bead holder unit 32 is finished. It is completely inserted into the bead setting ring 18.

In this way, due to the combination of the operation of inserting the bead B diagonally upward from the center and the escape of the bead holder arm 41, the bead (ring) B may be deformed or some of the lap portions of the bead cover _B2 may be deformed. etc., it is possible to easily insert the bead B even when the inner diameter changes, unlike the conventional case where the beads are pushed in parallel.

FIG. 8a shows that the part of the bead (ring) B having the lap part of the bead cover _B2 is first inserted into the bead setting ring 14, and then the part of the bead (ring) B having the lap part of the bead cover B2 is inserted into the bead setting ring 14,
However, as shown later in FIGS. 9a and 9b, the bead section on the opposite side inserted by the bead holder arm 41 has a bead section facing diagonally downward. Since the force F is applied, a downward force F1 is applied to the lap part of the bead cover B ₂ that was inserted first, so the rubber sheet at the lap part is compressed, which allows the bead part on the opposite side to be inserted. It becomes.

10a to 10c show the sequence of operations when only the bead (ring) B on the headstock side according to the present invention is automatically inserted.

First, in FIG. 1, the bead insertion unit 3
2 and the tail stock stand 11 are in a standby state.

In this state, when the bead B is supplied to the automatic bead insertion unit 32 by a suitable bead supply device (not shown), the bead B is held by the cylinder 63 between the tail stock side main shaft 13 and the expandable/contractable forming drum 19. The holder unit 32 is pivoted down to a predetermined position (see Figure 10a).

Then, the outer case 1 is placed on the headstock 15 side beyond the forming drum 19 whose diameter has been reduced.
Bead setting ring 1 attached to 6
8 is moved by the cylinder 72, and at the same time the tailstock stand 11 is also moved towards the forming drum 19 (see FIG. 10b).

Thereafter, the distance between the bead setting ring 18 and the tips of the bead holder arms 41 of the bead holder units 33a and 33b becomes a predetermined minute gap α (see FIG. 3), and the center of the bead setting ring 18 and the bead holder unit 32 is When the bead is aligned with the appropriate guide means, the bead press-fitting operation described above is performed. After that, base ring 3
1 is a cylinder 38 as shown in FIG. 10b.
Then, the cylinder 7 rotates upward without hitting the forming drum 19, which is already in the open position, as shown in Fig. 10c, and then the cylinder 7
2, the bead holder unit 32 returns to the standby position.

In the embodiment of the present invention, the base ring 31 of the automatic bead insertion unit 34 is divided into two parts, and operates very rationally as described above. However, if the base ring 31 is not divided, as shown in FIG. In state b, the diameter of the forming drum 19 is not expanded, but is left contracted, and after the bead is inserted, it is returned to the position shown in FIG. , and then the tail stock stand 11 should be ``out'', but it is clear that this order of operation takes more time than when the base ring 31 is divided.

〔Effect of the invention〕

As described above, this invention includes a forward/backward movement mechanism that is movable in parallel with the main shaft of the tire forming device on the tail stock stand side, and a base ring connected to the tip of this forward/backward movement mechanism. A bead insertion unit and a pair of beads disposed on both sides of the bead insertion unit are arranged in a circumferential direction on the surface side of the base ring, and are configured to be movable toward the bead setting ring while remaining parallel to a plane perpendicular to the main axis. A plurality of bead insertion unit mechanisms consisting of a holder unit and a bead insertion unit mechanism are arranged at predetermined intervals, and the pair of bead holder units are swingably supported by the base ring and support the inner surface of the bead at the tip. The bead insertion unit is comprised of an L-shaped bead holder arm attached to a base ring and a cylinder for swingingly driving the bead holder arm attached to the base ring, and the bead insertion unit is swingably supported by the base ring, and It is composed of an L-shaped insertion arm whose tip can come into contact with the side surface of the bead supplied to the bead holder arm, and a cylinder that is attached to the base ring and swings the tip of the arm, Since the arm is configured to automatically insert the bead into the bead setting ring while pushing the bead outward from the inner center, the following excellent effects can be achieved.

(1) By automatically inserting the bead ring, it is possible to reduce labor and improve productivity.

(2) Especially on the main body side, the bead is set by passing through the forming drum, so if the automatic step is advanced by mistake, an accident may occur where the operator's finger gets caught between the bead and the drum. This device ensures worker safety.

(3) Easy insertion even if the bead is deformed or the bead cover has a lapped portion and the inner diameter is uneven.

[Brief explanation of the drawing]

Figure 1 is a side view of the tire forming device, Figure 2 is a front view of the bead holder unit, Figure 3 is a partially enlarged sectional view of the bead holder unit and bead insertion unit, and Figure 4 is a side view of the bead holder unit. Figure 5 is a front view of Figure 4, Figure 6 is an explanatory diagram of the operation of the holder arm, Figure 7a is an operational diagram of the bead holder, Figure 7b is an explanatory diagram of the operation of the bead holder unit, and Figure 8 Figures a, 8b, 9a and 9b are explanatory diagrams of the operation during bead insertion, Figures 10a to 10c are explanatory diagrams of bead insertion by the tire forming device, and Figure 11 The figure is a side view showing another embodiment of the base ring, and FIGS. 12a and 12b are illustrations of a conventional parallel press-fitting method for beads. DESCRIPTION OF SYMBOLS 11... Tail stock stand, 18... Bead setting ring, 30... Bead insertion unit mechanism, 31... Base ring, 32... Bead insertion unit, 33a, 33b... Bead holder unit, 41... Bead Holder arm, 42... Arm base, 43... Pin, 47
...Cylinder, 48...Cylinder, 49...
Base plate, 52...Arm for insertion, 63
...Cylinder, 64...Output rod, 70...
Forward/backward movement mechanism, B...bead.

Claims (1)

[Claims] 1. A forward/backward movement mechanism 70 that can move parallel to the main shaft 13 of the tire forming device 10 is installed on the tail stock stand 11 side, and a base ring 31 is connected to the tip of this forward/backward movement mechanism 70. , bead setting ring 18
The base ring 3 is configured to move forward and backward while remaining parallel to a plane orthogonal to the main axis 13.
A bead insertion unit 32 is installed in the circumferential direction on the surface side of the
and a pair of bead holder units 33a and 33b disposed on both sides thereof. A plurality of bead insertion unit mechanisms 34 are disposed at predetermined intervals.
a and 33b are swingably supported by the base ring 31 and have an L-shaped bead holder arm 41 that supports the inner surface of the bead at its tip, and a bead holder arm 41 attached to the base ring 31 that drives the bead holder arm 41 to swing. The bead insertion unit 32 is swingably supported by the base ring 31 and has a tip that can come into contact with the side surface of the bead B supplied to the bead holder arm 41. L-shaped insertion arm 5
2 and the arm 5 attached to the base ring 31.
The arm 52 is configured to automatically insert the bead B into the bead setting ring 18 while pushing the bead B outward from the inner center and spreading it outward. An automatic bead insertion device characterized by: