JPH0319054B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an apparatus for winding a belt-shaped rubber material such as a belt ply or treaded rubber reinforced with steel cords around a forming drum in a tire manufacturing process.

(Prior Art and Problems to be Solved by the Invention) There is a need for a method and apparatus that mechanically performs the process of winding a band-shaped rubber material around a forming drum without bothering an operator. To date, apparatuses have been proposed for feeding a strip of rubber material onto a forming drum, but none have been sufficient to automatically wrap the strip of material onto the forming drum in an accurate butted manner without wrinkles or sagging.

(Objective of the Invention) Therefore, the present invention automates the work that conventionally required manual labor by automatically winding a band-shaped rubber material on the circumference of a forming drum without causing wrinkles or sagging. The aim is to significantly improve productivity.

(Means for Solving the Problems) In order to achieve the above object, an apparatus for winding a band-shaped rubber material around a molding drum according to the present invention includes a conveyance mechanism for conveying the band-shaped rubber material and a position of the band-shaped rubber material. a detection mechanism that transmits a position signal by
a forming drum around which the band-shaped rubber material is wound; and a forming drum at a predetermined intermediate region of the band-shaped rubber material based on the position signal at a speed relative to the circumferential speed of the forming drum and according to the length of the band-shaped rubber material. a control mechanism that sends a control signal to cause the conveying mechanism to convey the strip of rubber material at a speed;
By changing the conveying speed of the conveying mechanism relative to the circumferential speed of the forming drum by the control mechanism, the starting end and the terminal end of the belt-shaped rubber material are substantially pushed onto the forming drum. I try to wrap it so it fits.

(Function) According to the present invention, the band-shaped rubber material is automatically wound onto the circumference of the molding drum so as to accurately abut against each other without causing wrinkles or sagging. Therefore, tasks that were traditionally done manually are automated, and productivity is significantly improved.

(Embodiment) An apparatus for winding a belt ply reinforced with steel cords around a forming drum, which is an embodiment of the present invention, will be explained with reference to FIGS. 1 to 3 and 5. FIG.

FIG. 1 is a side view schematically showing the conveyance mechanism of this embodiment. In FIG. 1, 1 is a conveyance mechanism for conveying the belt ply, 2 is a forming drum for pasting the belt ply, 3 is a detection mechanism for detecting the position of the belt ply, and 4 is a control mechanism for controlling the conveyance mechanism 1. . 5 is a frame of the transport mechanism 1, 6 is a frame of a timing belt conveyor, and 7 is a pulse motor that drives the timing belt conveyor. 8 is an auxiliary transport mechanism, and 9 is a fixing plate for attaching the auxiliary transport mechanism 8 to the frame 5. 10 is a drive mechanism, 11 is a cylinder, and 12 is a rod of the cylinder 11. 13 and 14 are a light projector and a light receiver of the detection mechanism 3, respectively.

FIG. 2 is a diagram showing the positional relationship between the timing belt conveyor and the belt conveyor of the auxiliary conveyance mechanism 8, where 15 is the timing belt conveyor and 16 is the belt conveyor of the auxiliary conveyance mechanism 8.

In this embodiment, the conveyance mechanism 1 includes a frame 5, a timing belt conveyor 15, an auxiliary conveyance mechanism 8, a drive mechanism 10, and a pulse motor 7. The frame 6 of the timing belt conveyor 15 is rotatably fixed to the frame 5 at one end (the left end in FIG. 1), and the drive mechanism 1
Timing belt conveyor 1 by operation of 0
The other end of 5 can approach the forming drum 2.

FIG. 3 shows a section taken along the line A-A' in FIG. 17 is a plate whose both ends are fixed to the frame 6; 18, 19, 20, 21, and 22 are magnet pieces fitted to the plate 17; 23 is a timing belt;
Numerals 4, 25, 26, 27, and 28 are a plurality of narrow belts constituting a timing belt, and 29 is a belt ply. Belt 24, 25, 26, 2
7 and 28 are supported by a plurality of toothed rollers (not shown in FIG. 3), and have projections and depressions cut into their inner surfaces to engage with the teeth so that they can be driven accurately. A belt ply 29 is placed on the timing belt 23 and conveyed. In order to prevent relative positional deviation between the timing belt 23 and the belt ply 29, magnet pieces 18, 19 are placed on the top surface of the plate 17. 20, 21, and 22 are fitted, and the force generated between these and the steel cord in the belt ply 29 increases the frictional force between the belt ply 29 and the timing belt 23. In addition, magnet pieces 18, 19, 20, 2
1 and 22 do not need to exist over the entire area of the belt ply 29 in the conveyance direction, as long as they can obtain a suction force sufficient to prevent relative positional deviation between the belt ply 29 and the timing belt 23. For example, the plates 17 may be arranged at various locations in the transport direction, and therefore, the plates 17 do not necessarily need to be present throughout the entire transport direction. The pulse motor 7 controls the timing belt 2 based on the signal sent from the control mechanism 4.
The timing belt 23 is driven by rotating one of the aforementioned rollers supporting the timing belt 23. Belt conveyor 16 of auxiliary conveyance mechanism 8
are arranged so as to overlap at the tip of the timing belt conveyor 15, as shown in FIG. Compared to the timing belt conveyor 23 shown in FIG. 3, the magnet pieces of the auxiliary transport mechanism 8 are fixedly arranged in the opposite position, ie inside the lower conveyor belt. The belt conveyor 16 is separately provided with a suitable driving means so that the running speed of the belt conveyor 16 is exactly equal to that of the timing belt conveyor 15. Furthermore, if the positional relationship between the timing belt conveyor 15 and the forming drum 2 is as shown in FIG. 4, the auxiliary conveyance mechanism 8 is not necessarily necessary. The drive mechanism 10 rotates a frame 6 of a timing belt conveyor 15, which has one end rotatably fixed to the frame 5, and in this embodiment, one end is rotatably fixed to the frame 5. This is done by operating a rod 12 whose tip end of the cylinder 11 is rotatably fixed to the frame 6. Although the drive mechanism 10 is a useful mechanism, it is not necessarily necessary unless there is a need to change the relative positional relationship between the forming drum 2 and the timing belt conveyor 15 or belt conveyor 16. The detection mechanism 3 is composed of a light emitter 13 and a light receiver 14, and the light that passes between the timing belt 15 and is emitted from the light emitter 13 is transmitted to the light receiver 1.
4, the light can be received. The light receiver 14 transmits a signal to the control mechanism 4 depending on the state of light reception.

FIG. 5 is a side view of the molding mechanism used in this example, and the molding mechanism is indicated at 30 in FIG. The molding mechanism 30 includes a frame indicated by 31,
It is composed of a motor shown by molding drums 2 and 32 which can be expanded and contracted, a speed reducer shown at 33, and a fixed plate shown at 34. The molding drum 2 is rotatably supported by a fixed plate 34 fixed to a frame 31 at one end of its central axis, and is driven by a motor 32 via a speed reducer 33. A large number of magnet pieces are arranged inside the circumferential surface of the molding drum 2 to bring the belt ply 29 into close contact with the molding drum 2. A signal transmitter shown at 35 in FIG. 5 is attached to a suitable position of the molding mechanism 30. This transmitter 35 transmits a pulse signal to the control mechanism 4 according to the amount of rotation of the molding drum 2.

The control mechanism 4 is composed of a microcomputer, memory, etc., and the memory is programmed to perform the following operations.

(a) When the detection mechanism 3 detects the leading end of the belt ply 29 being conveyed on the timing belt conveyor 15, a position signal is received from the detection mechanism 3.

(b) A pulse signal is sent to the pulse motor 7 in order to convey the belt ply 29 until its tip touches the forming drum 2.

(c) A pulse signal corresponding to the rotation amount of the molding drum 2 is received from the signal transmitter 35, and at the same time, the circumferential speed of the molding drum 2 and the feeding speed of the timing belt conveyor 15 match in the predetermined length region of the belt ply 29. A signal is sent to the pulse motor 7 so as to do so.

(d) Pulses transmitted by the control mechanism 4 to the pulse motor 7 while the light from the projector of the detection mechanism 3 is blocked by the belt ply 29, which is known by being measured by a measuring device not shown after cutting. Measured by counting the number (in this case, the detection mechanism 3, control mechanism 4, and pulse motor 7 also have the function of a measuring device)
The length of the belt ply 29 is compared with a target value (the circumferential length of the forming drum 2), and the ratio at which the intermediate region of the belt ply 29 should be stretched or compressed is calculated. Note that the belt ply 29 before the length measurement is cut by a cutting machine to match the target value, or is artificially cut slightly shorter or longer than the target value. However, even if the belt ply 29 is cut according to the target value, an unavoidable dimensional error occurs in the longitudinal direction from the target value, so that the belt ply 29 has a length different from the target value.

(e) Send a signal with a long or short pulse interval to the pulse motor 7 based on the ratio calculated in (d) with respect to the pulses from the signal transmitter 35. As a result, the speed of the timing belt conveyor 15 is delayed or advanced relative to the circumferential speed of the forming drum 2 so as to stretch or compress the intermediate region of the belt ply 29.

(f) In response to the pulse from the signal transmitter 35, a pulse is transmitted to the pulse motor 7 so that the circumferential speed of the forming drum 2 and the feeding speed of the timing belt conveyor 15 match.

FIG. 6 shows the relationship between the molding drum 2 and the timing belt conveyor 15, where the horizontal axis shows the feeding distance on the circumference of the molding drum 2, and the vertical axis shows the feeding distance of the timing belt conveyor 15.
In the figure, a-b, b-c, and c-d are respectively the previous areas and
It corresponds to the middle area and the rear area. In this embodiment, as described above, the intermediate region of the belt ply 29 is fixed in proportion (b-c in Fig. 6 is a straight line).
However, it does not have to be in a fixed proportion; for example, the stretching ratio can be gradually increased from the first part of the middle area to the middle part, and then from the middle part to the last part. The insulator stretching ratio may be gradually reduced.

Next, the effect will be explained.

The belt ply 29 to be wrapped is made of a steel radial passenger car tire with a rim diameter of 13 inches, and the target length is 1740 mm. As mentioned above, since there is an error (approximately ±3 mm) during cutting, the cut is made so that the target cutting value is 1737 mm.

First, necessary values are input into the control mechanism 4, such as a target stretching value of 1740 mm for the belt ply 29, a length of the front region of 200 mm, and a length of the rear region of 200 mm. Furthermore, the drive mechanism 10 is operated (this operation may be controlled by the control mechanism 4), and the tip of the auxiliary conveyance mechanism 8 is brought closer to the molding drum 2, and the molding drum 2 is rotated.

The belt ply 29 is conveyed onto the conveying mechanism 1 by a belt conveyor or the like not shown in FIG. At this time, the belt ply 29 has already been
It is desirable that it is already centered so that there is no need to center it. The tip of the belt ply 29 sent onto the conveyance mechanism 1 is detected by the detection mechanism 3.
When reaching this point, the light from the projector 13 is cut off, and the receiver 14 transmits a signal to the control mechanism 4 that the belt ply 29 has been sent.

The control mechanism 4 sends a pulse to the pulse motor 7 to convey the tip of the belt ply 29 until it comes into contact with the forming drum. On the transport mechanism 1 , the belt ply 29 is transported by a distance that corresponds precisely to the amount of rotation of the pulse motor 7 due to the magnetic strip of the timing belt 23 . Before the belt ply 29 is conveyed from the timing belt conveyor 15 onto the molding drum 2, the belt ply 29 is conveyed in contact with the surface of the belt conveyor 16, which has a magnet piece arranged inside, so that it is accurately placed on the molding drum 2. transported to the desired location. Next, while receiving pulses from the signal transmitter 35, the control mechanism 4 transmits pulses to the pulse motor 7 so that the circumferential speed of the forming drum 2 and the feed speed of the timing belt conveyor 15 match, and area (in this case from the tip
200mm) onto molding drum 2. At this time, since a magnet is arranged inside the circumferential surface of the forming drum 2, the belt ply 29 is attached to the forming drum 2.
It can be wrapped tightly to the surface.

Next, the control mechanism 4 compares the length measured before being transported to the transport mechanism 1 or measured on the transport mechanism 1 with a target value. Now belt ply 29
Since the measured length was 1737 mm, it was necessary to stretch the belt ply 29 by 3 cm in the intermediate region and wrap it around the forming drum 2. Therefore, the control mechanism 4 sends pulses to the pulse motor 7 so that the speed of the timing belt conveyor 15 is reduced by 3/1340 with respect to the circumferential speed of the forming drum 2. In this way, the middle area, which was originally 1337 mm, was uniformly stretched to 1340 mm and the forming drum 2
wrapped around. Subsequently, the rear region is wound such that its feed speed corresponds to the circumferential speed of the forming drum 2. As a result, the belt ply 29 can be wrapped around the two forming drums without sagging, with the leading and trailing ends accurately butted against each other.
However, as long as there is no problem with the quality of the tire, please make sure that the leading edge and the trailing edge overlap slightly, or that the belt ply 29 is slightly opened.
You can also wrap it around.

In this embodiment, the feed speed of the timing belt conveyor 15 is controlled in relation to the circumferential speed of the forming drum 2, but it is also possible to control the circumferential speed of the forming drum 2 to correspond to the feed speed of the timing belt conveyor 15. Needless to say. Furthermore, the speed ratio between the timing belt conveyor 15 and the forming drum 2 does not have to be constant.

In addition, magnetic force was used to ensure accurate conveyance of the belt ply 29, but since magnetic force cannot be used for belt plies and other band-shaped rubber materials that are not reinforced with steel cords, etc., suitable means such as It will be clear that the objects of the present invention can be satisfactorily achieved by using an auxiliary conveyance mechanism, such as a holding roller or a vacuum cup that moves in synchronization with the timing belt conveyor 15. Further, for example, in the case of a band-shaped rubber material that is preferably wrapped while being compressed in the intermediate region, the target cutting value may be cut longer than the target value by an error range, and the material may be wrapped while being compressed in the intermediate region. Furthermore, it goes without saying that the cutting target value may be made equal to the target value, and the error during cutting may be corrected while being compressed or stretched in the intermediate region before winding.

(Effects) According to the present invention, it is possible to automatically and accurately wrap the band-shaped rubber material around the circumference of the molding drum without causing wrinkles or sagging, so it is possible to automate the work that previously required manual labor. Productivity can be significantly improved.

[Brief explanation of the drawing]

Figures 1 to 6 are views showing an embodiment of a device for winding a band-shaped rubber material around a molding drum according to the present invention. A schematic side view showing the positional relationship with the transport mechanism, Figure 3 is A in Figure 1.
- A' arrow sectional view, Figure 4 is a schematic side view showing the position of the timing belt conveyor different from Figure 2, Figure 5 is a side view of its molding mechanism, Figure 6 is its molding drum and timing It is a graph showing the relationship with a belt conveyor. DESCRIPTION OF SYMBOLS 1... Conveyance mechanism, 2... Molding drum, 3... Detection mechanism, 4... Control mechanism, 29... Band-shaped rubber material, 35... Signal transmitter.

Claims (1)

[Claims] 1. A conveyance mechanism that conveys the rubber band material, a detection mechanism that detects the position of the rubber band material and sends a position signal, a molding drum around which the rubber band material is wound, and a forming drum that conveys the rubber band material based on the position signal. Control for transmitting a control signal so that the conveyance mechanism conveys the rubber band material at a speed relative to the circumferential speed of the forming drum in a predetermined intermediate region of the material and at a speed corresponding to the length of the rubber band material. The control mechanism changes the conveying speed relative to the circumferential speed of the forming drum of the conveying mechanism, so that the starting end and the ending end of the belt-like rubber material are substantially aligned on the forming drum. A device for winding a band-shaped rubber material around a molding drum, characterized in that the rubber material is wound so that the ends of the rubber material meet each other.