JPH0533139B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to applying an unvulcanized material to the cylindrical outer circumferential surface of a rotating forming drum or the outer circumferential surface of an unvulcanized tire member already wrapped around the cylindrical outer circumferential surface. The present invention relates to a method for wrapping and molding an unvulcanized tire member by wrapping a sulfurized tire member and molding the unvulcanized tire member.

(Prior Art) Conventionally, unvulcanized material is applied to a rotatable forming drum and the outer circumferential surface of the cylindrical outer circumferential surface of the rotating forming drum or the outer circumferential surface of an unvulcanized tire member already wrapped around the outer circumferential surface of the cylindrical cylinder. It is equipped with an unvulcanized tire component supply device (usually called a servicer) that supplies vulcanized tire components, and once the unvulcanized tire component is wrapped around the outer circumferential surface for one turn, the forming drum is temporarily stopped. Then, the worker uses a hand tool to visually cut off the excess uncured tire material (if it has already been cut into one circumference, do not do this). Grasp the end of the sulfur tire member near the end (hereinafter referred to as the rear end) with your fingers and join it to the front end with a predetermined lap margin, and if necessary, apply hand rolls or stitch rolls to the joint. 2. Description of the Related Art An unvulcanized tire member wrapping/forming apparatus that performs a forming operation to complete the unvulcanized tire member wrapping/forming operation is well known.

(Problems to be Solved by the Invention) When an unvulcanized tire member is cut, it shrinks due to its internal stress and becomes shorter in length. The amount of shrinkage at this time differs in the width direction of the unvulcanized tire member due to the composition, temperature, etc. of the unvulcanized tire member. In addition, since there are unvulcanized tire components that cannot be cut, such as ply with steel cord, the worker grasps the rear end of the unvulcanized tire component with his fingers and holds it against the front end with a predetermined lap distance, as described above. Then, if necessary, perform forming operations such as hand rolls or stitch rolls on the joints to wrap and wrap unvulcanized tire parts.
Although the molding work is completed, this work requires skill, which limits the number of workers who can engage in the work, and requires heavy labor. There were also problems with inconsistent quality and lack of productivity.

The present invention has been proposed in view of the above-mentioned problems, and its purpose is to enable even an inexperienced person to easily join the front and rear ends of unvulcanized tire members in a butt state. Another object of the present invention is to provide a method for wrapping and forming unvulcanized tire members that can improve quality and work efficiency.

(Means for Solving the Problems) In order to achieve the above object, the method for wrapping and forming an unvulcanized tire member of the present invention includes rotating a forming drum in a wrapping direction to An unvulcanized tire member having a length slightly shorter than the circumference of the surface is wrapped around the outer peripheral surface of the forming drum so as to form a slight gap between the front and rear ends of the unvulcanized tire member. Then, the suction device is moved in the direction of both the front and rear ends, and the suction device adsorbs the rear end of the unvulcanized tire member, causing the rear end to slightly float above the cylindrical outer peripheral surface of the forming drum. By doing so, the rear end can be stretched, and then the forming drum is rotated again in the winding direction, and the rear end, which is still being sucked by the suction device, is pulled in the direction of the front end. At the same time, the front and rear ends of the unvulcanized tire member are brought close to the cylindrical outer circumferential surface of the forming drum and joined in abutting state, and from this state, the above-mentioned rear end and the above-mentioned rear end, which are continuously being rotated by the above-mentioned adsorber and forming drum, are joined. It is characterized in that the winding and forming of the unvulcanized tire member around the forming drum is completed by causing slippage between the two.

(Function) The method for wrapping and forming an unvulcanized tire member of the present invention involves rotating the forming drum in the winding direction as described above, and forming a tire with a length slightly shorter than the circumference of the cylindrical outer peripheral surface of the forming drum. The unvulcanized tire member is wound around the outer peripheral surface of the forming drum to form a slight gap between the front and rear ends of the unvulcanized tire member, and then the suction device is moved in the direction of the front and rear ends. The rear end of the unvulcanized tire member is adsorbed by the suction device, and the rear end is slightly lifted from the cylindrical outer surface of the forming drum, so that the rear end can be stretched. Then, the forming drum is rotated again in the winding direction, and the rear end part, which is still being adsorbed by the adsorber, is pulled in the direction of the front end part, and at the same time, brought close to the cylindrical outer peripheral surface of the forming drum,
The front and rear ends of the unvulcanized tire members are joined in a butt state, and from this state, slippage is caused between the adsorber and the rear end, which is still being rotated by the forming drum, and the unvulcanized tire member is joined. Finish wrapping and forming the tire member onto the forming drum.

Embodiment Next, the winding/forming apparatus used in the method of winding/forming an unvulcanized tire member of the present invention will be explained with reference to an embodiment shown in FIGS. 1 to 5. A forming drum that wraps and forms tire components;
11 is the cylindrical outer circumferential surface of the forming drum 1 (if the unvulcanized tire member has already been wrapped and molded around the cylindrical outer circumferential surface of the forming drum 1, the outer circumferential surface of the unvulcanized tire member), 12 is the rotating shaft of the molding drum 1, and the rotating shaft 12 is connected to a rotational drive device (not shown). Reference numeral 2 denotes a suction device swingably attached to the wrapping conveyor 7, which will be described later. ,
It is now able to swing. In this embodiment, a permanent magnet is used for each adsorption device 2, but if the unvulcanized tire member does not contain a ferromagnetic material such as a steel cord, a vacuum adsorption device is used. Also 3
is an unvulcanized tire member, 31, 32, 33, 3
4 and 35 indicate the cut ends of the unvulcanized tire member 3 at each point in time. Further, 4 is a substrate of the unvulcanized tire member supply device, 5 is a movable table movable in the front-rear direction perpendicular to the axis of the forming drum 1, 41 is a rail provided on the substrate 4, and 51 is the movable table. With the linear bearing attached to 5, the above moving table 5
is movable in the fore-and-aft direction by the rail 41, the linear bearing 51, and a drive device (not shown). In addition, 6 is attached to the movable table 5 with a pin 61.
The fluid pressure cylinder 7 is a winding conveyor, and the frame 71 of the winding conveyor 7 is pivotally supported to the piston rod of the fluid pressure cylinder 6 through a pin 52. The frame 71 of 7 is movable in the front-rear direction together with the movable table 5, and when the fluid pressure cylinder 6 is operated in the expansion/contraction direction, the front end side can be raised and lowered around the pin 52. Further, reference numeral 72 denotes an endless conveyor belt of the winding conveyor 7, and the endless conveyor belt 72 is stretched between rollers 73, which are rotatably attached to both front and rear ends of the frame 71. Note that one of the rollers 73, 73 is connected to a roller drive device (not shown). Further, reference numeral 74 denotes a plurality of adsorbers fixed to the upper surface of the frame 71 so as to contact the lower surface of the endless conveyor belt 72. In this embodiment, each adsorber 74 uses an electromagnet. Further, 75 is an end detector for the unvulcanized tire member 3 which is attached to the frame 71 so as to be movable in the left-right direction parallel to the axis of the molding machine 1; The cut edge passage detector 76 uses a photoelectric switch, a magnetic sensor, etc., and in this embodiment, three cut edge passage detectors 76 are arranged in the left and right direction. ing. In addition, 77 is an adsorption device (electromagnet in this example) for correcting the length of the unvulcanized tire member 3, and there are a plurality of them, all of which can be moved up and down, and can be moved in the left and right directions, and can also be individually moved in the front and rear directions. is attached to the frame 71. Note that the drive device for moving the respective length correction suction devices 77 in the above-mentioned directions is omitted from illustration. Further, in a portion 8, there is a known unvulcanized tire member cutting device (not shown) (an unvulcanized tire member cutting device using a hot knife or a disk knife). Further, reference numerals 80 and 81 are suction devices attached to the unvulcanized tire member cutting device, which are adapted to be raised and lowered by a lifting drive device. Further, 9 is a belt conveyor for conveying the unvulcanized tire member 3, and the belt conveyor 9 includes an endless conveyor belt 91.

Next, the operation of the unvulcanized tire member wrapping and forming apparatus shown in FIGS. 1 to 5 will be explained in detail. The unvulcanized tire member 3 that is adsorbed and held by the adsorbers 81 and 82 is moved when the adsorbers 81 and 82 are lowered, released, and
By the suction of the suction device 74, it is transferred to the belt conveyor 72 without being deformed, and after that,
The adsorbers 81 and 82 rise once. Next, the conveyor belts 91 and 72 are driven at the same speed, and the unvulcanized tire member 3 is moved to the forming drum 1 without being deformed.
When the cut surface of the unvulcanized tire member 3 passes under each detector 76, a counter 78 (not shown) built into the winding conveyor 7 Count the feed length and count the number corresponding to the preset length setting value of the unvulcanized tire member 3 (setting value set shorter than the circumference of the cylindrical outer peripheral surface of the forming drum 1). Then, the conveyor belts 91 and 72 are stopped.
At this time, the front end portion of the unvulcanized tire member 3 reaches the position 34. Next, the adsorbers 81 and 82 descend to adsorb the unvulcanized tire member 3, and the unvulcanized tire member cutting device 8 is activated to cut the unvulcanized tire member 3 (the unvulcanized tire member Depending on the type of cutting device 8, the unvulcanized tire member 3 is
1,82 and then cut off)
Next, the suction device 74 below the cutting position 33 stops its suction action, the suction devices 81 and 82 rise, and the unvulcanized tire member 3 near the cut end 33 is lifted. Next, the conveyor belt 72 is driven to send the cut unvulcanized tire member 3 toward the forming drum 1, and when the cut rear end portion 32 passes below the detector 76, the counter 78 The length of each part (three parts in the figure) of the unvulcanized tire member 3 is determined from the count, and based on this, the molding machine 1
The difference ΔLi between the circumferential difference of the cylindrical outer circumferential surface 11 and the circumferential difference ΔLi is calculated. When the cut rear end portion 32 reaches below the suction device 77, the conveyor belt 72 stops, the suction device 77 descends, and the vicinity of the rear end portion 32 of the unvulcanized tire member 3 is held by suction. The suction action of the suction devices 74 other than the suction device 74 located below the front end portion 31 is stopped, and the suction continues until the detection signal of the end detector 75, which is set in advance at a predetermined position, reaches a predetermined value. The container 77 moves in the left-right direction to center the unvulcanized tire member 3. Note that this centering is performed in order to correct the position near the rear end portion 32 that has shifted in the left-right direction during cutting. In addition, the required correction length of the unvulcanized tire member 3 is calculated from the amount of movement of the end detector 75 in the left and right direction and the ΔLi value, and each adsorbent is adjusted by an amount slightly less than each calculated value. 77 moves in the left-right direction, and the length of the unvulcanized tire member 3 is corrected.
However, if the cut surface has an angle with respect to the horizontal direction as shown in the figure, it is desirable to correct the length so that the acute angle side of the cut surface is somewhat shorter. When the length of the unvulcanized tire member 3 is corrected, the unvulcanized tire member 3 is suctioned and held on the conveyor belt 72 by the suction device 74, and the adsorption action of the suction device 77 is stopped, and the unvulcanized tire member 3 is raised and placed on the conveyor belt. 72 is driven,
When the unvulcanized tire member 3 is fed toward the forming drum 1 and the front end 31 reaches the position 35, the conveyor belt 72 stops and waits. When it is the turn to wrap the unvulcanized tire member 3, the moving table 5 moves in the direction of the forming drum 1, and the front end 31 of the unvulcanized tire member 3 on the conveyor belt 72 is wrapped around the cylinder of the forming drum 1. The front end side of the frame 71 rises, and the front end portion 31 of the unvulcanized tire member 3 moves forward toward the forming drum 1. is pressed against the cylindrical outer peripheral surface of the conveyor belt 7.
The conveyor belt 72 and the forming drum 1 are driven so that the moving speed of the forming drum 2 and the circumferential speed of the cylindrical outer peripheral surface of the forming drum 1 are the same, and the unvulcanized tire member 3 is moved around the outer periphery of the forming drum 1. It is held by the adsorption action of an adsorber (not shown) embedded in the surface or by the adhesive force of the unvulcanized tire member already wrapped around the outer peripheral surface of the forming drum 1, and winding starts. . Once the unvulcanized tire member 3 has been wrapped around the outer circumferential surface of the forming drum 1, the wrapping is temporarily stopped, the fluid pressure cylinder 6 is operated in the contraction direction, and the front end of the conveyor belt 72 is lowered. , away from the forming drum 1, the adsorber 2 swings, and the forming drum 1
The upper unvulcanized tire member 3 is pressed, and then the forming drum 1 is rotated again in the winding direction to form both front and rear end surfaces 3.
1 and 32 are facing each other. 1, 2, and 3 show this state (the state immediately before the wrapping and forming of the unvulcanized tire member 3 to be wrapped around the outer peripheral surface of the forming drum 1 is completed). That is, in FIG. 3, a slight gap is formed between the front and rear ends 31 and 32 of the unvulcanized tire member 3, and the rear end 32 is sucked by the suction device 2, and the cylindrical outer periphery of the forming drum 1 is It rises slightly from the surface and is in a state where it can be stretched. In this state, the forming drum 1 rotates, so
At the same time as the rear end 32 side is pulled in the direction of the front end 31, it approaches the cylindrical outer peripheral surface of the forming drum 1, and the rear end 32 joins the front end 31 in a butt state. continues to slide on the rear end portion 32 that rotates together with the forming drum 1, and the wrapping and forming of the unvulcanized tire member 3 around the forming drum 1 is completed. Furthermore, conveyor belt 7
If the forming drum 1 of No. 2 (the part pressed against the cylindrical outer circumferential surface 11 is flexible), the moving speed of the conveyor belt 72 should be lower than the rotational speed of the forming drum 1 when the state shown in FIG. 3 is reached. By slowing down, the same effect as adsorber 2 can be achieved,
The adsorber 2 can be omitted. Also, unvulcanized tire member 3
If the width of the unvulcanized tire member is larger than the width of the unvulcanized tire member already wrapped around the cylindrical outer circumferential surface 11 of the forming drum 1 and it overhangs, it is pressed by the suction device 2 from behind the overhang part of the front end acute angle part. After winding, by reversing the forming drum 1, it is possible to butt join the entire length of both the front and rear ends.

Embodiment Next, FIGS. 6 and 7 show other embodiments of the winding/forming apparatus used for carrying out the method of winding/forming an unvulcanized tire member of the present invention. To explain only the differences from the embodiments shown in FIGS. 1 to 5, reference numeral 21 is an adsorption device, and in the case of this embodiment, a permanent magnet is used for the adsorption device 21. The adsorber 21 is wrapped around the conveyor 7
It is attached to a conveyor frame 28, and can be moved up and down and moved in the front and rear directions by a drive device (not shown). Although the conveyor frame 28 of the winding conveyor 7 is fixed to the floor surface, it may be supported by a movable table and made movable as in the embodiments shown in FIGS. 1 to 5.

Next, the operation of the winding/forming device shown in FIGS. 6 and 7 will be specifically explained. When the length of the unvulcanized tire member 3 is corrected as in the embodiment shown in FIGS. 1 to 5, the front end portion moves to the position 35 and waits.
When the turn for winding comes, the suction device 21 descends,
The vicinity of the front end of the unvulcanized tire 3 is attracted, and then the conveyor belt 72 and the forming drum 1 are moved so that the moving speed of the conveyor belt 72 and the circumferential speed of the cylindrical outer peripheral surface of the forming drum 1 are the same. The unvulcanized tire member 3 is driven by the adsorption action of an adsorber (not shown) embedded in the outer peripheral surface of the forming drum 1 or the unvulcanized tire already wrapped around the outer peripheral surface of the forming drum 1. The members are held together by their adhesive force and winding begins. When the suction device 21 passes over the cylindrical outer peripheral surface 11 of the forming drum 1, it rises and returns to 21 in FIG. 7. When the rear end surface 32 of the unvulcanized tire member 3 reaches a predetermined position near the bottom of the suction device 21 which has returned to the position shown in FIG. The container 21 is the rear end surface 3 of the unvulcanized tire member 3
It descends to around 2 and winding is started again. When the winding progresses to the vicinity of the rear end, the moving speed of the suction device 21 is reduced to continue the winding, and when both the front and rear ends are brought into contact with each other, the conveyor belt 72 and the forming drum 1 are stopped, Adsorption device 21
Return to the position shown in Figure 7 to complete the winding.

In each of the embodiments described above, the adsorbers 77 are individually movable in the front-rear direction, but if the difference in the amount of shrinkage of the unvulcanized tire member 3 depending on the position is small enough to be ignored, The movement in the longitudinal direction is omitted, and instead, the unvulcanized tire member 3
This may be done by suctioning and holding the rear end portion with a suction device 77 and feeding the Koubea belt 72 in the front and back direction. In addition, the adsorber 74 is attached to the conveyor frame 7.
Instead of being fixed to the belt conveyor 8, the suction device 74 may be fixed to the belt conveyor 72 and moved by the belt conveyor 72. In that case, the number of adsorbers 74 can be reduced. Further, the belt for supporting the unvulcanized tire member 3 and the belt for moving the suction device 74 may be arranged alternately. Further, if the unvulcanized tire member 3 does not contain a ferromagnetic material such as steel, the adsorber may be replaced with a vacuum adsorber. In addition, the frictional force due to the adsorption force of the adsorbers 2, 21, 77 is insufficient, and the adsorbers 2, 21, 77
77 and the unvulcanized tire member 3 and it is not possible to apply a predetermined tension to the unvulcanized tire member 3. A needle-like protrusion may be provided to compensate for the lack of suction force. In addition, a part of the unvulcanized tire member 3 is transferred to the cylindrical outer peripheral surface 1 of the forming drum 1.
1 and then cutting it, the length of the winding conveyor 7 can be shortened.

(Effects of the Invention) The method of wrapping and forming an unvulcanized tire member of the present invention involves rotating the forming drum in the wrapping direction as described above, and rolling the forming drum to a length slightly shorter than the circumference of the cylindrical outer peripheral surface of the forming drum. The unvulcanized tire member is wrapped around the outer peripheral surface of the forming drum to form a slight gap between the front and rear ends of the unvulcanized tire member. The rear end of the unvulcanized tire member is adsorbed by the suction device, and the rear end is slightly lifted from the cylindrical outer surface of the forming drum, so that the rear end can be stretched. Then, the forming drum is rotated again in the winding direction, and the rear end portion, which is still being adsorbed by the adsorber, is pulled in the direction of the front end portion, and at the same time, brought close to the cylindrical outer peripheral surface of the forming drum. , the front and rear ends of the unvulcanized tire member are joined in a butt state, and from this state, slippage is caused between the adsorption device and the rear end that is still being rotated by the forming drum, and the unvulcanized tire member is joined. Since the winding and forming of the vulcanized tire member around the forming drum is completed, even an inexperienced person can easily join the front and rear ends of the unvulcanized tire member in a butt state.

Furthermore, since the butt joining of the front and rear ends of the unvulcanized tire member can be automated as described above, quality and work efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a forming drum portion of a wrapping/forming device used for carrying out the method of wrapping and forming an unvulcanized tire member of the present invention, and FIG.
3 is a side view taken along the arrow line in the figure, FIG. 3 is a vertical sectional side view taken along the arrow line in FIG. Its plan view, FIG. 6 is a side view showing another embodiment, and FIG. 7 is a side view showing another embodiment.
The figure is a plan view thereof. DESCRIPTION OF SYMBOLS 1... Forming drum, 11... Cylindrical outer peripheral surface of forming drum 1, 2 or 21... Adsorption device, 3... Unvulcanized tire member, 31... Front end of unvulcanized tire member 3, 32... Rear end of unvulcanized tire member 3, 7
2...Unvulcanized tire member supply device.

Claims (1)

[Claims] 1. Rotate the forming drum in the winding direction, and wrap an unsulfurized tire member with a length slightly shorter than the circumference of the cylindrical outer circumferential surface of the forming drum so as to go around the outer circumferential surface of the forming drum, A slight gap is formed between the front and rear ends of the unvulcanized tire member, and then the suction device is moved in the direction of the front and rear ends, and the rear end of the unvulcanized tire member is suctioned by the suction device. By slightly lifting the rear end from the cylindrical outer peripheral surface of the forming drum, the rear end can be stretched, and then the forming drum is rotated again in the winding direction to continue being sucked by the suction device. The rear end of the unvulcanized tire member is pulled in the direction of the front end, and at the same time brought close to the cylindrical outer peripheral surface of the forming drum, and the front and rear ends of the unvulcanized tire member are joined in a butt state, and from this state, the above-mentioned The unvulcanized tire member is characterized in that the winding and forming of the unvulcanized tire member around the forming drum is completed by causing slippage between the adsorber and the rear end portion which is continuously being rotated by the forming drum. How to wrap and form tire components.