JPS6358699B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a forming drum, and in particular, to a compact mechanism for forming a green tire or a tire belt, etc. so that the diameter of the drum can be changed during expansion. It was made by sea urchin.

[Conventional technology]

Conventionally, in the molding of green tires and the like, a molding drum is used in which the drum diameter is changed by expanding and contracting a plurality of circularly arranged drum shells in the radial direction. This kind of forming drum is
For example, JP-A-53-57283, JP-A-56-
As disclosed in Publication No. 75850, etc., an air cylinder mechanism is provided on the drum shaft so that either the cylinder tube or the piston can slide in the axial direction, and the sliding member of this air cylinder mechanism and the drum shell are is connected to a drum segment that expands and contracts in the radial direction via a link mechanism, and the operation of the air cylinder mechanism is transmitted to the drum segment via the link mechanism to expand and contract the diameter of the drum segment. .

[Problem that the invention seeks to solve]

In the above-mentioned conventional forming drum, the drum diameter when the drum shell is expanded and contracted has a predetermined dimension depending on the stroke length of the air cylinder mechanism. There is no mechanism to change the stop position of the cylinder tube or piston, so
If it is not possible to change the drum diameter to a different dimension from the original setting, and therefore it becomes necessary to change the drum diameter, the drum segment must be replaced, or the drum shells with different drum diameters can be used. There is a problem in that the drum must be stored and the entire drum must be replaced, which requires a great deal of time and effort each time the drum is replaced.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a forming drum that allows the diameter of the drum to be changed during expansion and that has a compact overall structure.

[Means for solving problems]

The sliding member of either the cylinder tube or the piston of an air cylinder mechanism provided surrounding the drum shaft is connected to the drum segment via a link mechanism, and the sliding member is slidably fitted in the axial direction inside the drum shaft. The combined slide rod and the sliding member of the air cylinder mechanism are connected by a connecting member, and the drum shaft has a hole on the front end side into which the front end of the slide rod is slidably fitted, and one end of the hole is A mechanism for regulating the forward position of a slide rod is provided, which includes a closed stopper and a holder that detachably holds the stopper.

[Effect]

By regulating the forward position of the slide rod, the stroke length of the air cylinder mechanism connected to the slide rod can be changed arbitrarily, and the drum diameter when expanded by the air cylinder mechanism and the link mechanism can be adjusted. It can be modified to different dimensions for different stroke lengths.

In addition, the air cylinder mechanism is provided surrounding the drum shaft, and the slide rod that slides in connection with the air cylinder mechanism is also fitted inside the drum shaft, so a mechanism for regulating the forward position of the slide rod is added. Even if provided, the entire device will have a small and compact structure.

〔Example〕

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention, with the upper half from the center line showing the state when the diameter is reduced, and the lower half showing the state when the diameter is expanded. In FIG. 2, the upper half from the center line is a view taken along the line A in FIG. 1, and the lower half is a view taken along the line B in FIG.

In the above figure, reference numeral 10 is the main shaft of a headstock device of a molding machine (not shown), and this main shaft 1
The flange portion 13 of the drum shaft 12 is fitted in a cantilevered manner to the tip of the drum shaft 12. At the tip of the drum shaft 12,
A flange 15 fixed by a key 14 is fixed by a nut 16.
A plurality of slide guides 17 are radially attached to the back surface of 5. The slide guide 17 has
A drum segment 18 is fitted in each drum segment 18 so as to be slidable in the radial direction, and an arc-shaped drum shell 19 is attached to the outer circumferential surface of each drum segment 18 and arranged in a cylindrical shape.

An air cylinder mechanism 20 is provided on the main shaft side of the drum shaft 12 to surround the drum shaft 12. Flange portion 13 of drum shaft 12 and cylinder end 21
A cylinder tube 22 is fitted between the drum shaft 12 and the cylinder tube 22, and an annular piston 23 is fitted between the drum shaft 12 and the cylinder tube 22 so as to be slidable in the axial direction. The inner circumferential surface and outer circumferential surface of the piston 23 maintain airtightness between the drum shaft 12 and the cylinder tube 22 by O-rings 24 and 25, respectively. A drive sleeve 27 having an air passage 26 between it and the drum shaft 12 is fixed to the piston 23 . The end of the drive sleeve 27 on the cylinder end side is a stepped flange shaped drive rod 28.
The drive rod 28 is slidably fitted to the outer peripheral surface of the drum shaft 12. The outer peripheral surface of the drive sleeve 27 is the cylinder end 21
The inner peripheral surface of the drive sleeve 27 is connected to the O ring 29 provided on the drive sleeve 27.
Each cylinder end 21 by a ring 30
This maintains airtightness between the drum shaft 12 and the drum shaft 12.

Cylinder front chamber 3 of the above air cylinder mechanism 20
1, an air passage 33 provided inside the main shaft 10 communicates via air passages 34 and 35 inside the drum shaft 12, and an air passage coaxial with the air passage 33 of the main shaft 10 is provided in the cylinder rear chamber 32. 36 is drum shaft 1
2, an air passage 26 between the drum shaft 12 and the drive sleeve 27, and an air passage 38 of the drive sleeve 27.

Drive rod 2 of the air cylinder mechanism 20
8 and the drum segment 18 are connected by a link mechanism 40. This link mechanism 4
0 connects one end of the pair of links 41 and 42 to pin 4.
The links 41 and 42 form a parallelogram, with the other end connected to the drive rod 28 through pins 3 and 44 and the drum segment 18 through pins 45 and 46, respectively, with the intermediate position of the link 42 and the flange connected to each other. 15, the link 47 is connected to the pins 48, 4.
connected by 9.

Furthermore, a slit 51 is provided at the tip of the drive rod 28 by cutting out the drum shaft 12 in the axial direction.
A pin 50 fitted inside is connected. This pin 50 is connected to the rear end of a slide rod 52 that is fitted into the drum shaft 12 so as to be slidable in the axial direction, so that the slide rod 52 can reciprocate in the axial direction by the drive rod 28. ing.

At the leading end of the drum shaft 12, a ring-shaped fixing member 53 fixed to the end face of the flange 15 is provided with a mechanism 60 for regulating the forward position of the slide rod 52. The forward position regulating mechanism 60 includes a stopper 72 that slidably supports the tip of the slide rod 52, a holder 61 that removably holds the stopper 72, and a spring that aligns and locks the stopper 72 with the holder 61. It is composed of a connecting pin 70 of the formula. Holder 61 and stopper 7
2 and 2 are shown in FIGS. 3 to 7.

As shown in FIGS. 3 to 5, the holder 61 has a cylindrical hole 62 opened at one end.
The ring-shaped body has a rectangular opening 64 with one side smaller than the diameter of the hole 62 on the bottom wall 63 at the other end of the hole 62, and has a plurality of bolt holes drilled around the outer periphery of the hole 62. It is attached to the fixing member 53 on the end face of the flange 15 by tightening a bolt (not shown) to the flange 65 . A bracket 67 is fixed to the bottom wall 63 of the holder 61, and the large diameter part of the tip of the connecting pin 70 passed through the pin hole 68 on the end face of the bracket 67 is fixed to the bottom wall 63 of the holder 61.
3 through the pin hole 66 provided in the bracket 6.
The connecting pin 70 is connected by a spring 69 housed inside the
is constantly pressed and biased in the insertion direction. (See Figure 1).

As shown in FIGS. 6 and 7, the stopper 72 closes one end of a hollow body provided with a hole 73 for inserting a slide rod with a grip 74, and has a circular plate with opposing surfaces parallel to each other at the open end. Notched irregular shaped flange 7
5 is installed. The outer shape and thickness of the irregularly shaped flange 75 are approximately equal to the diameter and thickness of the hole 62 of the holder 61, respectively, and the length dimensions between the opposing notched surfaces and between the opposing circumferential surfaces are the same as those of the holder 61.
The vertical and horizontal dimensions of the opening 64 are slightly smaller than those of the opening 64. This irregularly shaped flange 75 is provided with two opposing pin holes 76 in a circumferential shape having the same radius as the pin holes 66 in the bottom wall 63 of the holder 61 .

When attaching the stopper 72 to the holder 61, align the irregularly shaped flange 75 with the opening 64 of the holder 61, insert the slide rod 52 into the hole 73, and then while pulling the handle 71 of the connecting pin 70 toward you, After placing your hand on the grip part 74 of the stopper 72 and rotating it 90 degrees in either direction, aligning the pin hole 76 of the stopper 72 with the pin hole 66 of the holder 61, remove the connecting pin 7.
When you release your hand from the handle 71 of
6, and in this state, the irregularly shaped flange 75 of the stopper 72 is inserted into the hole 62 of the holder 61 and the bottom wall 6.
3 will be locked. To remove the stopper 72 from the holder 61, the operation described above may be reversed.

A collar 80 is removably housed at the bottom of the hole 73 of the stopper 72, and the collar 80 can be replaced with one of a different length, or the stopper 72 itself can be replaced with one of a different length. By doing so, the forward position of the slide rod 52 sliding within the stopper 72 is regulated.

In the forming drum having the above configuration, the diameter reduction and diameter expansion of the drum shell 19 is performed as follows.

Compressed air is introduced from the air passage 36 inside the main shaft 10 to the air passage 37 of the drum shaft 12, and then to the drum shaft 1.
2 and the drive sleeve 27
6. When compressed air is sent to the cylinder rear chamber 32 of the air cylinder mechanism 20 through the air passage 38 of the drive sleeve 27, the piston 23, the drive sleeve 27, and the drive rod 28 move back, and the piston 23 moves toward the flange 13 of the drum shaft 12. It comes into contact with and stops. As a result, the drum segment 18 is guided by the slide guide 17 via the link mechanism 40 and slides radially inward to form the drum shell 1.
9 is reduced in diameter, resulting in the state shown in the upper half of FIGS. 1 and 2.

Contrary to the above, the air passage 33 outside the main shaft 10
When compressed air is supplied to the cylinder front chamber 31 of the air cylinder mechanism 20 through the air passages 34 and 35 of the drum shaft 12, the piston 23, the drive sleeve 27, and the drive rod 28
moves forward, and the tip of the slide rod 52 connected to the drive rod 28 comes into contact with the collar 80 in the stopper 72 and stops. As a result, the drum segment 18 is guided by the slide guide 17 via the link mechanism 40 and slides radially outward, causing the drum shell 19 to expand in diameter.
The state is shown in the lower half of the figure.

During the forward movement of the piston 23 of the air cylinder mechanism 20, the stroke length of the piston 23 can be arbitrarily changed by regulating the forward position of the slide rod 52. When changing the length, remove the stopper 72 attached to the tip of the slide rod 52 from the holder 61 as described above and replace the stored collar 80 with a separately prepared collar of a different length, or
Alternatively, the stopper 72 itself may be replaced with a separate one of a different length.
This allows the drum to be expanded to any desired diameter.

In the above embodiment, a case has been described in which the piston 23 of the air cylinder mechanism 20 is slid back and forth, but conversely, it is also possible to fix the piston 23 to the drum shaft 12 and use the cylinder tube 22 as a sliding member. . In this case, the link mechanism 40 is connected to the cylinder tube 22, and the slide rod 52 is also fixed to the cylinder tube 22, so that the same operation as in the previous embodiment can be performed.

〔Effect of the invention〕

As explained above, the present invention provides an air cylinder mechanism surrounding the drum shaft of a forming drum, connects the sliding member of the air cylinder mechanism to the drum segment via a link mechanism, and connects the sliding member of the air cylinder mechanism to the drum segment inside the drum shaft. The slide rod is slidably fitted in the axial direction to connect the sliding member of the air cylinder mechanism and the slide rod, and a mechanism for regulating the forward position of the slide rod is provided on the distal end side of the drum shaft.
Therefore, according to the present invention, the stroke length of the air cylinder mechanism can be changed arbitrarily by regulating the forward position of the slide rod, so there is no need to change the drum diameter when expanding the diameter. Even in such a case, there is no need to replace parts such as drum segments and drum shells, and there is no need to store a large number of these parts.

Further, according to the present invention, the air cylinder mechanism and the slide rod connected to the sliding member of the air cylinder mechanism are respectively disposed on the outer peripheral side and inside the drum shaft within the range of the axial length thereof, Since the forward position regulating mechanism of the slide rod is provided on the front end side of the drum shaft, the entire device can be made short and compact, and the installation space is reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, in which the upper half shows the state when the diameter is reduced, and the lower half shows the state when the diameter is expanded.
In Fig. 2, the upper half is a view taken along the line A in Fig. 1, the lower half is a view taken in the direction B shown in Fig. 1, Fig. 3 is a sectional view of the holder, and Figs. 4 and 5 respectively show the holder. 6 is a sectional view of the stopper, and FIG. 7 is a sectional view taken along the line CC in FIG. 6. In the figure, 12 is a drum shaft, 18 is a drum segment, 19 is a drum shell, 20 is an air cylinder mechanism, 22 is a cylinder tube, 23 is a piston,
40 is a link mechanism, 50 is a connecting pin, 52 is a slide rod, and 60 is a mechanism for regulating the forward position of the slide rod.

Claims (1)

[Claims] 1 A plurality of drum segments to which arc-shaped drum shells are fixed are arranged radially around the drum shaft and supported so as to be slidable in the radial direction, surrounding the drum shaft to form either a cylinder tube or a piston. An air cylinder mechanism is provided, one of which slides back and forth in the axial direction of the drum shaft, and the sliding member of either the cylinder tube or the piston of the air cylinder mechanism is connected to the drum segment via a link mechanism, A slide rod capable of sliding in the axial direction of the drum shaft is fitted inside the shaft, the slide rod and the sliding member of the air cylinder mechanism are connected by a connecting member, and the tip of the slide rod is slidably fitted. A mechanism for regulating the forward position of the slide rod is provided on the front end side of the drum shaft, and includes a stopper with a hole that closes one end of the hole, and a holder that removably holds the stopper. molded drum.