JP2017148953A - Undertread pressing device and undertread pressing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an undertread pressing technology capable of precisely adjusting the descent position of a disc roller and improving work efficiency.SOLUTION: In pneumatic tire manufacturing, an undertread pressing device for pressing an undertread and sticking it to a tread, includes a plurality of discs and a shaft inserted into the discs. The undertread pressing device also includes: a disc roller to press the undertread to the tread; a lifting mechanism to lift the disc roller; stoppers to stop the disc roller descended by the lifting mechanism at a predetermined position; a stopper position detection mechanism to detect the position of the stoppers; and a stopper position adjustment mechanism to adjust the position of the stoppers.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an undertread pressing device and a pressing method for pressing and bonding an undertread to the back surface of a tread in manufacturing a pneumatic tire.

  In the production of a pneumatic tire, there is a step of pressing and bonding a sheet-like rubber (under tread) to a tread rubber (base, gap) extruded in an extrusion process (Patent Documents 1 and 2).

  Specifically, using an undertread holding device provided with a disc roller that is configured by inserting hundreds of discs through a shaft, with the undertread on the upper side and the tread on the lower side, The undertread is pressed against the back surface of the tread and bonded to the belt-like sheet that has been conveyed by the operator lowering the disk roller disposed above the undertread toward the undertread.

  At this time, since the adhering state between the undertread and the tread is determined by the pressing force of the disc roller, it is important to appropriately adjust the lowering position of the disc roller that affects the pressing force of the disc roller. It becomes. That is, if the press is insufficient, air may enter between the tread and the tread. On the other hand, if the press is excessive, the under tread in contact with the disk roller may be damaged.

  Therefore, conventionally, in order to stop the disc roller that has been lowered to an appropriate position, a stopper is provided in the undertread presser, and the operator manually adjusts the position of the nut that locks the stopper to a predetermined position. After that, the disc roller is lowered.

JP 2009-279890 A JP2013-086264A

  However, in the case of the above-described method, since the adjustment of the descending position of the disc roller is performed manually by the operator, a slight shift may occur depending on the skill level and physical condition of the operator, and precise adjustment can be performed. I couldn't say that.

  Further, in a tread line in which the thickness is frequently changed, it is necessary to frequently adjust the descending position of the disk roller, which hinders improvement in work efficiency.

  Therefore, an object of the present invention is to provide an under-tread pressing technique that can precisely adjust the lowered position of the disk roller and can improve the working efficiency.

The invention described in claim 1
An undertread holding device that presses an undertread and attaches it to the tread in the production of a pneumatic tire,
A disc roller having a plurality of discs and a shaft through which the disc is inserted, and pressing the under tread against the tread;
An elevating mechanism for elevating the disk roller;
A stopper for stopping the dis-roller descending by the elevating mechanism at a predetermined position;
A stopper position detection mechanism for detecting the position of the stopper;
It is an under tread pressing device having a stopper position adjusting mechanism for adjusting the position of the stopper.

The invention described in claim 2
The undertread holding device according to claim 1, wherein the stopper position detecting mechanism is a stopper position detecting mechanism using an encoder, and the stopper position adjusting mechanism is a stopper position adjusting mechanism using a motor. .

The invention according to claim 3
The undertread pressing device according to claim 1, further comprising a display device that displays the position of the stopper detected by the stopper position detection mechanism.

The invention according to claim 4
The undertread holding device according to any one of claims 1 to 3, wherein an openable / closable door for inserting and removing the disc is provided on a side surface of the shaft of the disc roller. It is.

The invention described in claim 5
The undertread holding device according to any one of claims 1 to 4, wherein a material of the disc is SUS.

The invention described in claim 6
The undertread pressing device according to any one of claims 1 to 5, wherein the disk is supported on the shaft by a plurality of bearings.

The invention described in claim 7
In the production of a pneumatic tire, an undertread pressing method for pressing the undertread using the undertread pressing device according to any one of claims 1 to 6 and bonding the undertread to the tread.
Arranging the stopper at a position corresponding to the undertread and the tread to be bonded; and
Detecting the position of the stopper disposed by the stopper position detection mechanism;
Adjusting the position of the stopper by the stopper position adjusting mechanism based on the detection result;
Lowering the disk roller toward the under tread by the lifting mechanism;
Stopping the disk roller descending at a predetermined position based on the position of the stopper;
A method of pressing the undertread against the tread by rotating the stopped disk roller.

The invention according to claim 8 provides:
The undertread press device according to claim 7, wherein the position of the stopper is adjusted based on the position of the stopper displayed on the display device using the undertread press device according to claim 3. Is the method.

  ADVANTAGE OF THE INVENTION According to this invention, the under-tread pressing technique which can adjust the descending position of a disk roller precisely and can aim at the improvement of work efficiency can be provided.

It is the partial sectional view which looked at the undertread presser concerning the 1 embodiment of the present invention from the front. It is the partial cross section figure which looked at the under tread pressing device shown in Drawing 1 from the left side. It is a top view of the undertread pressing device shown in FIG. It is a figure which shows an example of the shape of a disk roller. It is a figure explaining that the defective tread decreased by using the disc roller pressing device of the present invention.

  Hereinafter, based on an embodiment, the present invention will be described with reference to the drawings.

1. Configuration of Undertread Pressing Device According to this Embodiment First, the configuration of the undertread pressing device according to this embodiment will be described. 1, 2, and 3 are a partial cross-sectional view as seen from the front, a partial cross-sectional view as seen from the left side, and a plan view, respectively, of the undertread holding device according to this embodiment.

  The undertread holding device 1 according to the present embodiment is the same as the conventional undertread holding device in that it includes a disk roller 2, an elevating mechanism, and a stopper, but a stopper position detecting mechanism and a stopper position adjusting mechanism. It differs from the conventional undertread holding device in that it has. Hereinafter, each configuration of the undertread holding device 1 according to the present embodiment will be specifically described.

(1) Disc roller The disc roller 2 is a member that presses the undertread against the tread, and a plurality of doughnuts (about a few dozens) corresponding to the width of the conveyor that carries the undertread and the tread to be bonded together. And a shaft 22 through which the disk 21 is inserted and supported. Each disk 21 has a center hole 21 a having a diameter larger than the outer diameter of the shaft 22. Thereby, when pressing an undertread, it can press appropriately according to the unevenness | corrugation of the surface of an undertread. Note that SUS is preferably used as the material of the disk 21. The disc roller 2 is housed in a housing (not shown).

(2) Elevating mechanism The elevating mechanism is configured to be able to raise and lower the disk roller 2 described above. Specifically, the cylinder 31 arranged vertically, the frame 33 that moves up and down by the expansion and contraction of the cylinder 31, and a bearing that is attached to one end of the frame 33 and rotatably supports the shaft 22 in a cantilevered state. 36.

  The rod 31 a of the cylinder 31 extends downward and is connected to the upper surface of the frame 33. By contracting the cylinder 31 and raising the frame 33, the shaft 22 of the disc roller 2 supported by the bearing 36 is raised. Further, the shaft 22 of the disk roller 2 is lowered by extending the cylinder 31 and lowering the frame 33.

  In this embodiment, the disk 21 is inserted through the shaft 22 and used. However, in order to obtain sufficient strength, the disk 21 is preferably supported by a plurality of bearings.

(3) Stopper The stopper 60 is a member that stops the disroller 2 that is lowered by the elevating mechanism at a predetermined position, and is combined with the beam 6 to constitute a disc roller stopping mechanism.

  Specifically, the beam 6 is connected to the frame 33 via the connecting member 34, and is configured to move up and down as the frame 33 moves up and down.

  A pair of left and right stoppers 60 are provided so as to be positioned below the beam 6. When the beam 6 is lowered, the beam 6 is locked by the stopper 60 so that the lowering of the frame 33 is restricted and the lowering of the disk roller 2 is stopped.

  The stopper 60 is supported by a screw jack 61, and the screw jack 61 is connected to a motor 62 via a driving force transmission mechanism (not shown). Accordingly, the stopper 60 can be moved up and down by driving the motor 62, and the height of the disc roller 2 can be adjusted by adjusting the position where the stopper 60 is engaged with the descending beam 6 (stopper). Position adjustment mechanism).

(4) Stopper position detection mechanism The driving force transmission mechanism connected to the motor 62 is attached with an encoder 67 as a stopper position detection mechanism for detecting the position of the stopper. Thereby, the encoder 67 can detect the position of the stopper 60 in the vertical direction based on the rotational speed of the motor 62.

  The encoder 67 is connected to a display device (not shown), and the detected position of the stopper 60 is preferably digitized and displayed on the display device. Thus, the operator can adjust the position of the stopper 60 accurately by operating the motor 62 while confirming the digitized position of the stopper 60.

  The numerical value of the position of the stopper 60 is obtained by setting the position of the shaft 22 when the disk roller 2 and the conveyor roller (not shown) below the disk roller 2 are in contact with each other to 0, for example, the shaft 22 of the disk roller 2. Is arranged as a positive value, and arranged as a lower value when it is arranged below.

2. Operation and Function of Undertread Holding Device According to this Embodiment (1) Positioning of Disk Roller In this embodiment, the disk roller 2 is positioned at a desired position before starting the bonding of the undertread.

  Specifically, first, the motor 62 is operated, and the stopper 60 is lowered and arranged near the stop position determined based on the undertread and the tread to be bonded. Thereafter, adjustment is performed by the motor 62 until the position of the stopper 60 detected by the encoder 67 reaches the stop position described above. At this time, the detected position of the stopper 60 is preferably displayed on the display device. In this case, since the position of the stopper 60 can be adjusted while referring to the digitized position of the stopper 60, the disc roller 2 can be easily placed at the optimum position with respect to the undertread and the tread that are to be bonded. Can be arranged.

  Next, with the stopper 60 positioned at a predetermined position, the cylinder 31 is extended and the frame 33 is lowered to lower the shaft 22 of the disk roller 2.

  Since the beam 6 connected to the frame 33 comes into contact with the stopper 60 and is locked, the lowering of the frame 33 is restricted. At this time, the contraction of the cylinder 31 is stopped and the lowering of the disk roller 2 is stopped. Stop. As a result, the disk roller 2 can be easily and precisely positioned at a desired position before starting the bonding of the undertread.

(2) Bonding Next, the belt-like sheet laminated with the undertread on the upper side and the tread on the lower side is conveyed to the undertread holding device, and the undertread is formed with the disk roller 2 positioned at a desired position. Press down on the tread and paste.

  At this time, since the diameter of the center hole 21a of the disk 21 is larger than the outer diameter of the shaft 22, each disk 21 moves up and down along the surface shape of the undertread to be pressed. This allows the undertread to be attached to the tread with an appropriate pressing force without damaging the surface of the undertread, corresponding to the surface shape of the undertread. It is possible to suppress the occurrence of defects such as the accumulation of water or the damage of the undertread.

  In this embodiment, as described above, the position of the stopper 60 can be adjusted by driving the motor, and the disk roller 2 can be positioned by the stopper 60, so that the thickness is frequently changed. Even with a simple tread line, the disk roller 2 can be positioned quickly and accurately, and work efficiency can be improved.

  If the stopper position is configured to be displayed numerically, the stopper position can be adjusted while referring to the numerically displayed stopper position, and the undertread that is the object to be bonded In addition, the disc roller 2 can be arranged at a more optimal position with respect to the tread.

  In addition, it is preferable to provide an openable / closable door 42 for inserting and removing the disk on the side surface of the apparatus shown in FIG. Conventionally, in order to remove foreign matters such as rubber and dust (fume) adhering to the disk roller 2, it has been necessary to periodically clean the disk roller 2, but by providing an openable door 42 on the side of the apparatus, the disk roller Since 2 can be easily taken out, the time for regular cleaning can be shortened, and the work efficiency can be further improved.

  Hereinafter, based on an Example, this invention is demonstrated more concretely.

  A tread line equipped with a conventional undertread holding device was prepared for testing, and the conventional undertread was pressed for 7 months from the start of operation. And the number of occurrences per day was determined every month.

  The disk shown in FIG. 4, that is, a disk with a diameter of 228 mm, a thickness of 3 mm, a center hole of 120 mm, and a material of SUS304, is a number corresponding to the conveyor width of the treadline (800 sheets) (260 sheets). A disc roller was configured.

  Then, from the 8th month, the undertread holding device is replaced with the undertread holding device according to the above-described embodiment, and the undertread holding is performed for two months. Similarly, the number of occurrences per day every month. Asked.

  The results are shown in Table 1 and FIG.

  As shown in Table 1 and FIG. 5, after the improvement, the number of defects is reduced by about 80% in comparison with the average, and by using the undertread holding device according to the present embodiment, the stopper It can be seen that the position can be adjusted precisely.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to said embodiment. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Under tread press device 2 Disc roller 21 Disc 21a (disc) center hole 22 Shaft 31 Cylinder 31a Rod 33 Frame 34 Connecting member 36 Bearing 42 Door 6 Beam 60 Stopper 61 Screw jack 62 Motor 67 Encoder

Claims (8)

An undertread holding device that presses an undertread and attaches it to the tread in the production of a pneumatic tire,
A disc roller having a plurality of discs and a shaft through which the disc is inserted, and pressing the under tread against the tread;
An elevating mechanism for elevating the disk roller;
A stopper for stopping the dis-roller descending by the elevating mechanism at a predetermined position;
A stopper position detection mechanism for detecting the position of the stopper;
An undertread holding device having a stopper position adjusting mechanism for adjusting the position of the stopper.   The undertread holding device according to claim 1, wherein the stopper position detecting mechanism is a stopper position detecting mechanism using an encoder, and the stopper position adjusting mechanism is a stopper position adjusting mechanism using a motor.   The undertread pressing device according to claim 1, further comprising a display device that displays a position of the stopper detected by the stopper position detection mechanism.   The undertread holding device according to any one of claims 1 to 3, wherein an openable / closable door for inserting and removing the disc is provided on a side surface of the shaft of the disc roller. .   The undertread holding device according to any one of claims 1 to 4, wherein a material of the disk is SUS.   The undertread holding device according to any one of claims 1 to 5, wherein the disk is supported on the shaft by a plurality of bearings. In the production of a pneumatic tire, an undertread pressing method for pressing the undertread using the undertread pressing device according to any one of claims 1 to 6 and bonding the undertread to the tread.
Arranging the stopper at a position corresponding to the undertread and the tread to be bonded; and
Detecting the position of the stopper disposed by the stopper position detection mechanism;
Adjusting the position of the stopper by the stopper position adjusting mechanism based on the detection result;
Lowering the disk roller toward the under tread by the lifting mechanism;
Stopping the disk roller descending at a predetermined position based on the position of the stopper;
A method of pressing the undertread against the tread by rotating the stopped disk roller.   The undertread press device according to claim 7, wherein the position of the stopper is adjusted based on the position of the stopper displayed on the display device using the undertread press device according to claim 3. Method.

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