JP3402394B2 - Rubber sheet cutting device with steel cord - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber cord coated with a steel cord, and more particularly to a steel cord suitable for cutting an ultra-wide rubber sheet used for an ultra-large tire or the like. The present invention relates to an apparatus for cutting a rubber sheet. 2. Description of the Related Art In a rubber sheet containing an ultra-wide steel cord used for an ultra-large tire or the like, a steel cord arranged in a direction substantially perpendicular to the longitudinal direction of the rubber sheet is often greatly curved. Because it is not easy to mechanize when cutting along the code arrangement direction,
The cutting was performed exclusively by hand using an electric heating knife or the like. On the other hand, in the case of a rubber sheet containing a small steel cord, there is a mechanized example (Japanese Patent Laid-Open No. 59-16192) because the steel cord has a small curvature. In this example, a blade support extends in the width direction of the lower surface of the rubber sheet, and when a round blade cutter is pressed from above onto the rubber sheet along the axis of the steel cord, a V-shape is formed. When the cutting edge bites into the rubber sheet and reaches the blade cradle, the rubber sheet at the cutting edge is cut. The rolling rollers lead the round blade cutter to press the rubber between the cords, thereby preventing the cords from being damaged or exposed from the cut surface, thereby reducing the cutting load. However, in the above example, since the round blade cutter cuts the rubber sheet while rolling on the blade receiving base, the round blade cutter is not necessarily free in the direction perpendicular to the running direction. In the case of an ultra-wide rubber sheet that cannot move and has a large curvature of the steel cord, the round blade cutter may ride on the steel cord and may not be able to cut the rubber sheet along the arrangement direction of the steel cord. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and even when a rubber sheet has a steel cord having a large curvature, a rubber sheet containing a steel cord can be cut by a cutter along a direction in which the steel cords are arranged. The purpose of the present invention is to provide a cutting device. Accordingly, the present invention provides a cutting apparatus for cutting a rubber sheet on which steel cords are arranged substantially in parallel along the direction in which the steel cords are arranged. A traveling member that travels along, a lifting member that moves up and down while being supported by the traveling member, and a swing member that is supported by the lifting member and that is swingable in a direction perpendicular to the traveling direction, A cutter supported by the swinging member, a rolling ring supported by the swinging member and pressing a rubber sheet between steel cords in front of the cutter in the running direction, and synchronized with the rolling of the rolling ring. A rolling roller that supports the rubber sheet from below at a position directly below the rolling ring; and the rolling ring and the cutter interposed between the elevating member and the swinging member. And a guide which is movable in a direction perpendicular to the running direction. According to the present invention, when cutting of the rubber sheet between the steel cords is started from one end in the width direction of the rubber sheet containing the steel cords, the elevating member is lowered and the cutting edge of the cutter is changed to the rubber between the steel cords. Cut the sheet, press the rolling ring against the rubber cord between the steel cords at the front position of the cutter in the running direction, and run the running member along the steel cord arrangement direction. Presses the rubber between the steel cords supported on the rolling rollers located immediately below, to guide the cutter, and the cutter cuts thereafter. Further, when the blade edge of the cutter descends directly above the steel cord, before the blade edge of the cutter cuts into the rubber sheet, the rebound of the rubber compressed between the outer skin of the rubber sheet and the steel cord causes the cutter to retreat. The supporting swinging member swings in a direction perpendicular to the traveling direction, and is cut into the rubber sheet between the steel cords while avoiding the steel cords. When the curvature of the steel cord is large, the rolling ring and the cutter are moved by the guide to the curved side so as to avoid the front steel cord before the cutting edge of the cutter rides on the front steel cord. The rolling ring and cutter always move in a direction perpendicular to the traveling direction so as to keep the position between the steel cords. Thus, even if the steel cord is greatly curved, the rolling ring and the cutter meander so as to match the curvature of the steel cord, so that the rubber sheet between the steel cords is reliably cut. An embodiment of the present invention will be described below with reference to FIGS. The cutting apparatus (hereinafter referred to as "cutting apparatus") S for a rubber sheet containing a steel cord of the present embodiment is a rubber sheet containing an ultra-wide steel cord (hereinafter referred to as a "rubber sheet") used for an ultra-large tire or the like. FIG. 1 is a plan view and FIG. 2 is a front view. Also,
FIG. 3 is a side view showing a main part of the cutting device S. A rubber sheet 1 placed on a transport roller 10 and transported in a longitudinal direction as shown in FIG. 5 has a large number of steel cords 2 arranged substantially in the width direction. Since the steel cord 2 is super-wide, it is hard to be straight as shown in FIG. 1 and is curved, and the degree of curvature is large. A horizontal frame 11 is laid on columns 12 located on both sides of the rubber sheet 1 so as to cross over the rubber sheet 1 in the width direction. This horizontal frame 1
As shown in FIG. 3, two upper and lower LM guides 1
A slider 15 fixed to the rear surface of the traveling member 14 is slidably fitted to the LM guide 13, and the traveling member 14 is supported along the LM guide 13 so as to travel in the width direction. . A motor 17 is mounted on one end of the horizontal frame 11 via a bracket 16, and a sprocket 18 is fitted on a drive shaft protruding in the downstream direction of the conveyance of the rubber sheet 1. A sprocket 21 is rotatably supported by a bearing 20 provided on a bracket 19, and a chain 2 is provided between the sprockets 18 and 21.
2, and a part of the chain 22 is locked to the traveling member 14. Therefore, the traveling member 14 travels in the width direction of the rubber sheet 1 via the chain 22 by the driving of the motor 17. As shown in FIG. 3, a pair of vertically extending LM guides 23 are fixed to the front surface of the traveling member 14, and a slider 26 fixed to the back plate 25 of the elevating member 24 slides on the LM guides 23. Fits freely. The tip of a rod 30 of a cylinder 29 fixed to the lower surface of a horizontal plate 28 projecting forward from the front surface of the traveling member 14 is fixed to a bottom plate 27 of the lifting member 24. Therefore, the lifting member 24 moves up and down along the LM guide 23 by the operation of the cylinder 29. Two rails 31 extending horizontally in a direction perpendicular to the width direction are fixed to the lower surface of the bottom plate 27, and an LM guide 33 laid on the upper surface of a slide plate 32 is slidably mounted on the rails 31. Mated. A locking member 34 having a U-shape in a top view is integrally connected to the slide plate 32 laterally in the width direction, and a horizontal pin 36 extending in the width direction is provided between both locking pieces 35 of the locking member 34. It is pivoted. A swinging member 37 swinging around the horizontal pin 36 is pivotally supported on the horizontal pin 36. A cutter mounting block 40 is provided on one end in the width direction of a bottom plate 38 of the swinging member 37 via a heat insulating plate 39. Is mounted on the cutter mounting block 40, and an electrothermal cutter 41 is mounted by bolts 41a. A concave portion 40a is formed in the bottom plate 38, the heat insulating plate 39, and the cutter mounting block 40, and the heater 4 for heating the cutter is formed in the concave portion 40a from above.
0b is inserted. As shown in FIG. 4, a bearing 42 is fixed to the other end of the bottom plate 38 in the width direction, and a rolling ring 43 located forward of the cutter 41 in the advancing direction of the cutter 41 is connected to the bearing 42 via a pin 44. Supported rotatably. As shown in FIG. 5, the rolling ring 43 preferably has a peripheral edge 43a so as to help push the rubber between the steel cords 2.
It is shaped like a disk with a taper that tapers toward. Further, in relation to the cutter 41,
As shown in FIG. 5, in order to make the rubber sheet 1 deeper, the sectional width of the peripheral edge 43 a of the rolling ring 43 is made smaller than the sectional width of the cutting edge of the cutter 41. In order to increase the pressing force, it is more desirable to make the cross-sectional width of the base end of the rolling ring 43 larger than the cross-sectional width of the cutting edge of the cutter 41. A bolt 45 is horizontally screwed to the back plate of the locking member 34, and by changing the amount of approach of the tip of the bolt 45 to the back surface of the swinging member 37, the swinging amount (swinging) of the swinging member 37 is changed. (Moving angle). On the other hand, as shown in FIG. 2, a column 12 for supporting the horizontal frame 11 is fixed on a horizontal bed 50, and a bearing 51 is provided at one end of the horizontal bed 50 and directly below the motor 17. Is installed, and this bearing 5
The sprocket 52 is rotatably supported on one rotation shaft,
A bearing 53 is installed at the other end of the horizontal bed 50, and a sprocket 54 is rotatably supported on a rotating shaft of the bearing 53, and a chain 55 extends between the sprockets 52, 54. The chain 5 is also provided between the sprocket 18 at the tip of the motor 17 and the sprocket 52 immediately below.
6 have been bridged. Therefore, the drive of the motor 17 is also transmitted to the chain 55 via the chain 56,
And the rotation of the chain 55 are synchronized. On the upper surface of the horizontal bed 50, a guide rail 57 that is located immediately below the cutter 41 and extends in the width direction is laid. Two LM guides 59 fixed to the lower surface of the roller support 58 are slidably fitted to the guide rail 57, and a part of the chain 55 is locked to the roller support 58. Accordingly, when the motor 17 is driven, the roller support 58 travels in the width direction along the guide rail 57, and the roller support 58 and the travel support member 14 run in the same direction in synchronization. ing. A bearing 6 is provided on the upper surface of the roller support base 58.
The rolling roller 61 is rotatably supported via the first roller 0. The rolling roller 61 is located immediately below the rolling ring 43, and supports the lower surface of the rubber sheet 1 from below. The cutting apparatus S of this embodiment has the above-described configuration, and the operation procedure will be described below. When the rubber sheet 1 is transported, the cutter 41
Are waiting at a position above the rubber sheet 1. When the rubber sheet 1 is conveyed over the conveying roller 10 by a predetermined amount and stopped, the cylinder 29 is operated to set L
The elevating member 24 descends along the M guide 23, and the rolling ring 43 and the cutter 41 supported by the swing member 37.
Is lowered, and the cutting edge of the cutter 41 bites into the rubber portion between the steel cords 2 of the rubber sheet 1. At this time, when the cutting edge of the cutter 41 is located immediately above the steel cord 2 portion, if the cutting edge of the cutter 41 attempts to push down the outer skin of the rubber sheet 1, the cutting edge of the cutter 41 is perpendicular to the traveling direction. Oscillating around the horizontal pin 36 in the direction, so that the cutting edge of the cutter 41 slides from directly above the steel cord 2 due to the repulsive force of the compressed rubber between the outer skin and the steel cord 2. Into the rubber portion between the steel cords 2. Subsequently, as shown in FIG.
Is pressed down the rubber sheet 1 in front of the cutter 41 and presses the steel cords 2 apart. When the motor 17 is actuated in this state, the traveling member 14 travels along the LM guide 13 across the rubber sheet 1 via the chain 22. As a result, the rolling ring 43 rolls on the rubber sheet 1 along the direction in which the steel cords 2 are arranged.
And press the steel cords 2 apart. The chain 55 is also driven by the motor 17, and the roller support 58 runs under the rubber sheet 1 along the LM guide 59 in the same direction as the running direction of the running member 14. In this case, since the chain 55 is synchronized with the chain 22, the rolling roller 61 on the roller support 58 is always located immediately below the rolling ring 43 with the rubber sheet 1 interposed therebetween. Steel cord 2 accompanying rolling of steel
Support from below so that the pushing operation between them is performed reliably. The cutting edge of the cutter 41 follows after the rubber sheet 1 is pushed down and the steel cords 2 are pressed apart while the rolling ring 43 rolls. At this time, the cutting load of the cutting edge of the cutter 41 is reduced by leading the rubber between the steel cords 2 to be pressed apart, so that the cut surface of the rubber sheet 1 is finely finished. When the steel cord 2 is greatly curved, the cutter 41 is movable in a direction perpendicular to the traveling direction along the LM guide 33, so that the steel cord 2 can be easily curved. , The cutter 41 does not ride on the steel cord 2, and the steel cord 2 can be cut cleanly along the steel cord 2 without exposing the steel cord 2 to the cut surface. According to the present invention, since the above-mentioned configuration is adopted,
Even if the steel cord is greatly curved, the cutter can easily follow the steel cord and move, and the rubber sheet can be reliably cut along the steel cord.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a cutting device according to an embodiment of the present invention, FIG. 2 is a front view of the cutting device, and FIG. 3 is a side view showing a main part of the cutting device. 4 is an enlarged view of a circle A in FIG. 2 showing a main part of the cutting device, and FIG. 5 is a sectional view showing an operation of a rolling ring. [Description of Signs] 1 Rubber sheet 2 Steel cord 14 Running member 24 Elevating member 33 LM guide (guide) 37 Swinging member 41 Cutter 43 Rolling ring 61 Rolling roller.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B29D 30/46 B26D 1/14-1/18 B26D 1/56-1/60

Claims (1)

(1) In a cutting device for cutting a rubber sheet on which steel cords are arranged substantially in parallel along the direction in which the steel cords are arranged, the rubber sheet travels along the direction in which the steel cords are arranged. A traveling member that moves up and down while being supported by the traveling member; a swing member that is supported by the elevation member and that is swingable in a direction perpendicular to the traveling direction; A rolling ring, which is supported by the swinging member and presses the rubber sheet between the steel cords in the running direction of the cutter in front of the cutter, and rolls in synchronization with the rolling of the rolling ring. A rolling roller that supports the rubber sheet from below at a position directly below the rolling ring, and the rolling ring and the cutter interposed between the elevating member and the swinging member in a direction perpendicular to a traveling direction. Movably to the guide and steel cords rubber sheet cutting apparatus characterized by comprising a.