JPH06155632A - Method and device for cutting band-like rubber member containing steel cord - Google Patents

Abstract

PURPOSE:To make a round cutter follow cords so as to cut a band-like rubber member easily by a method and a device wherein a part of the band-like rubber member floating in the air in a mounted state is cut by the round cutter, which is movable rectangularly with respect to the running direction, running with rotation. CONSTITUTION:When a rubber sheet 1 is conveyed for a predetermined quantity and stopped, support rollers 60, 61 go up and raise the sheet 1 so as to form a mounted part 1a. Rubber pressers 64b, 65b at upstream and downstream sides are protruded so as to press the sheet 1, so that the part 1a is pulled to both sides so as to be tensioned. Here, when a round cutter 30 is lowered, the edge of the blade bites a predetermined position of the sheet 1 accurately and pulls in the outer skin of the sheet 1 with the V-shaped edge. Steel cords 2 embedded in the sheet 1 floating in the air in a mounted state move easily so as to evade the cutter. The edge bites a space formed with a neighboring cord 2 so as to cut the biting part by providing a cutter receive plate 71 on the bottom face of the bitten part 1a, so that the blade edge penetrates the bottom face of the sheet 1, thereby cutting the sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cutting a strip-shaped rubber member having a steel cord coated with rubber.

[0002]

2. Description of the Related Art In a rubber sheet containing an ultra-wide steel cord used for a super-large tire, a steel cord embedded in a direction substantially perpendicular to the longitudinal direction of the rubber sheet is often greatly curved. Since it was not easy to mechanize along the line, it was cut by hand using an electric heating knife.

In the case of a small-sized rubber sheet containing a steel cord, there is little bending of the steel cord, so that there is a mechanized example (Japanese Patent Laid-Open No. 1-183396).

In the same example, a blade receiving plate is extended across a predetermined area on the lower surface of the rubber sheet in the width direction, and when a round blade cutter is pressed against the rubber sheet from above to align with the axis of the steel cord, a V-shape is formed. When the shaped blade bites into the rubber sheet and reaches the blade receiving plate, the rubber sheet at the blade edge is cut.

The V-shaped cutting edge bites the outer skins of the left and right rubber sheets by dragging them so that the steel cords are always cut. The round blade cutter is supported so that it can move freely in the direction perpendicular to the running direction,
When the round blade cutter is run along the axis of the steel cord, the round blade cutter can easily follow the steel cord and cut between the steel cords on both sides due to the small curvature of the steel cord.

Further, there is an example (Japanese Patent Publication No. 49-11107) in which a knife cutter is heated and can be displaced slightly in a direction perpendicular to the cutting direction. The knife edge of the example has a dogleg shape rather than a sharp edge, and the rubber sheet is cut without cutting the steel cord due to the blade tip shape, the thermal relationship of the blade, and a slight displacement of the blade.

[0007]

[Problems to be Solved] However, in the former example, since the round blade cutter cuts the rubber sheet while rolling on the blade receiving plate, the round blade cutter cannot always move freely in the direction perpendicular to the traveling direction, and the steel cord It is unavoidable that the round blade cutter may ride on the steel cord in the case of an ultra-wide rubber sheet in which the steel cord has a large curvature. Further, since the blade of the round blade cutter rolls on the blade receiving plate, the blade wears quickly and there are many maintenance problems.

[0008] In the latter example, the blade displacement is small and the steel cord is still largely curved. In addition, when the belt-shaped rubber member becomes extremely wide, the heat of the knife is easily lost during traveling. It may not be possible to disconnect.

The present invention has been made in view of the above points, and a purpose thereof is to cut the embedded steel cord along the steel cords on both sides by the round blade cutter even if the buried rubber cord has a large curvature. The present invention is to provide a method and a device for cutting a strip-shaped rubber member containing a steel cord.

[0010]

In order to achieve the above-mentioned object, the present invention provides a step of conveying a strip-shaped rubber member in which a steel cord is embedded so that it is oriented substantially in the width direction in the longitudinal direction, and the strip-shaped rubber member. Stopping the rubber member at a predetermined position and applying a tension to the belt-shaped rubber member at a predetermined position of the belt-shaped rubber member between front and rear support portions having a constant front-rear width in the longitudinal direction; A step of lowering a round blade cutter from above to a erected portion where tension is applied between the front and rear support parts in a posture along the steel cord, and applying a cutter receiver from below to thread the round blade cutter through the strip-shaped rubber member. And a steel cord containing the step of retracting the cutter receiver and running the round blade cutter in the cutting direction of the blade while being movable in a direction perpendicular to the running direction to cut the strip-shaped rubber member. It was cut method Jo rubber member.

The front and rear support portions having a constant width in the front and rear direction with respect to the longitudinal direction support predetermined portions of the belt-shaped rubber member, and support both ends in a state in which tension is applied to the belt-shaped rubber member between the support portions, so that it is almost steel. The erected portion between the front and rear support portions of the belt-shaped rubber member supported along the cord is mainly stretched by the embedded rubber.

When a cutter receiver is applied to a part of the erected portion in the tensioned state and the round blade cutter is lowered from above to perform blade insertion, the blade edge is temporarily steel when the cutter is lowered from above. Even if it hits the cord, the steel cord moves so as to avoid the cutter and assists the blade threading.After the blade threading, the cutter receiver is retracted and floats in the hollow. For cutting, even if the embedded steel cord is curved due to the movement of the round blade cutter in a direction perpendicular to the traveling direction, it easily follows and the circular blade cutter runs along the steel cord and forms a strip between the steel cords. The rubber member can be cut.

By fixing the movement of the round blade cutter in a direction perpendicular to the traveling direction at the center when the blade is threaded, the cutting position can be accurately determined and the blade can be threaded. To cancel.

[0014]

[Embodiment] An embodiment of the present invention shown in FIGS. 1 to 12 will be described below. The cutting device 10 of the present embodiment,
A rubber sheet 1 containing an ultra-wide steel cord used for an ultra-large tire or the like can be appropriately cut, and FIG. 1 is a plan view thereof.

The strip-shaped rubber sheet 1 placed on the conveying roller 11 and conveyed in the longitudinal direction has a large number of steel cords 2 embedded in parallel in the width direction. Since it is extremely wide, the steel cord 2 is hard to be straight and curved, and the degree of bending is large.

A horizontal support member 12 is laid across the upper side of the rubber sheet 1 in the width direction, and the horizontal support member 12 is provided.
The slider 14 fixed to the traveling support member 15 is slidably fitted to the two upper and lower LM guides 13 laid on the side surfaces of the traveling support member 15 so that the traveling support member 15 can travel in the width direction along the LM guide 13. It is supported.

On the other hand, a motor 17 is installed at one end of the horizontal support member 12 via a bracket 16, and a sprocket 18 is fitted on a drive shaft projecting in the downstream direction of conveyance of the rubber sheet 1, and the other of the horizontal support member 12 is mounted. A sprocket 21 is rotatably supported at the end by a bearing 20 provided on a bracket 19, and both ends of a chain 22 spanned between both sprockets 18 and 21 are fixed to the upper part of the traveling support member 15. Therefore, when the motor 17 is driven, the traveling support member 15 travels in the width direction of the rubber sheet 1 via the chain 22.

A boss 25 protruding from the lower portion of the traveling support member 15.
An arm member 26 whose upper end is pivotally supported is swingably suspended in the traveling direction, and a free end of the arm member 26 is provided with a U-shaped cutter bracket 27. The spline shaft 28 is rotatably installed on the
A round blade cutter 30 having a V-shaped edge is rotatably supported in the spline shaft 28 via a ball spline 29 so as to be movable in the spline shaft direction, and the blade of the round blade cutter 30 is oriented in the traveling direction.

A mounting member 31 is attached to the upper wall of the cutter bracket 27.
The air motor 32 is attached by the above, and the timing pulley 33 is fitted to the drive shaft protruding to the upstream side thereof, while the spline shaft 28 penetrates the side wall of the cutter bracket 27 and the timing pulley 34 is fitted to the end thereof. A timing belt 35 is bridged between the timing pulleys 33 and 34. Air is supplied to the air motor 32 via a tube 36 and is driven to rotate at high speed, and the spline shaft 28 is rotated at high speed together with the round blade cutter 30 via a timing belt 35.

The circular blade cutter 30 is rotatable in this way, and at the same time, is movable by the ball spline 29 in the axial direction, that is, in the direction perpendicular to the traveling direction.

A bracket 37 is projected on one side surface of the traveling support member 15, and a cylinder 40 is supported by a bearing 38 fixed to the bracket 37 with the lower part of the main body being pivotally supported by a pin 39 and protruding downward. The tip of the cylinder rod 40a is pinned to the cutter bracket 27 at the free end of the arm member 26.
It is pivotally attached by 41, and as shown in FIG. 2, the arm member 26 is supported in an obliquely swinging posture. Therefore, when the cylinder rod 40a of the cylinder 40 is retracted, the arm member 26 is swung upward to raise the round blade cutter 30, and when the cylinder rod 40a is projected, the arm member 26 is swung downward to swing the round blade cutter 30. Can be lowered.

Centering means is provided along the swinging arm member 26. That is, as shown in FIG. 4, the left and right symmetrical gripping members 43 and 44, which are pivotally supported by overlapping the bent portions by the support shaft 42 fixed to the arm member 26, bend their lower end sides in a direction closer to each other, and The end holding plates 45 and 46 face each other with the round blade cutter 30 in between.

On the other hand, the upper ends of the gripping members 43 and 44 are provided with a cylinder rod 47a of a cylinder 47 fixed to the arm member 26.
Link member 4 with one end pivotally attached to pin 48
It is pivotally connected to the other ends of 9, 50 by pins 51, 52, respectively. The straight line connecting the cylinder rod 47a, the pin 48, and the support shaft 42 passes through the center between both side walls of the cutter bracket 27, and the gripping members 43, 44 swing symmetrically with respect to this straight line, and the cylinder 47 moves the cylinder rod 47a. Link member when protruding
The gripping members 43, 44 swing via the spindle 42 via 49, 50 to bring the gripping plates 45, 46 closer to each other, and grip the circular blade cutter 30 between them.

Therefore, when the cylinder 47 projects the cylinder rod 47a, the round blade cutter 30 is centered and fixed in the center, and when the cylinder rod 47a is retracted, the round blade cutter 30 is released to slide in the spline axial direction. Will be free.

Next, an elevating means for lifting a part of the rubber sheet 1 below the rubber sheet 1 will be described. Below the rubber sheet 1 along which the round blade cutter 30 travels, support rollers 60, 61 are arranged rotatably supported from below by a roller receiving member 62 with a certain front and rear width.

The roller receiving member 62 moves up and down by the cylinder 63, and when descending, the supporting rollers 60 and 61 move the supporting rollers 11 and 11.
The rubber sheet 1 is smoothly conveyed to the same height as
When it rises, the rubber sheet 1 is lifted between the support rollers 60 and 61, and a flat ridge having a constant front and rear width is formed in the width direction of the rubber sheet 1 below the traveling path of the round blade cutter 30.
The erected portion 1a between the lifted support rollers 60, 61 of the rubber sheet 1 is in a state of being stretched by the embedded rubber.

Further, in the cutting device 10 of this embodiment, a plurality of cylinders 64 and 65 are separately arranged on both sides of the traveling path of the round blade cutter 30, and the upstream side support roller 60 slightly lowers the cylinder rod 64a protruding downward. Support roller 60 towards the side
The rubber sheet portion 64b on the upstream side can be pressed by the tip rubber sheet retainer 64b from above, and the downstream cylinder 65 is
The tip end rubber sheet retainer 65b can press the rubber sheet portion on the downstream side of the support roller 61 from above, with the cylinder rod 65a projecting downward facing slightly upstream. Below the pressed rubber sheet portion, receiving plates 66 and 67 having wedge-shaped grooves are provided.

Therefore, the erected portion 1a of the rubber sheet 1 which is lifted and erected by the rise of the support rollers 60 and 61 is
The protrusions of the cylinder rods 64a and 65a of the cylinders 64 and 65 further press the front and rear sides of the rubber sheet retainers 64b and 65b into a tighter tensioned state. First, lower the rubber sheet retainers 64b and 65b to lower the support plates 66,
The support rollers 60 and 61 may be raised after holding the belt-shaped rubber member between 67.

A cylinder rod 70a is provided at a predetermined position in the center of the support rollers 60 and 61, which is biased to one side in the width direction of the rubber sheet 1.
The cylinder 70 is disposed with the cylinder facing upward, and the cutter receiving plate 71 is fixed to the upper end of the cylinder rod 70a.
When the cylinder 70 projects the cylinder rod 70a,
The cutter receiving plate 71 just abuts on the lower surface of the erected portion 1a of the rubber sheet 1 which has been lifted upward, and retracts downward when unnecessary.

The cutting device 10 of the present embodiment has the above-mentioned structure, and its operation procedure will be described below with reference to FIGS. When the rubber sheet 1 is conveyed, as shown in FIG. 5, the support rollers 60 and 61 descend to facilitate the conveyance of the rubber sheet 1, and the round blade cutter 30 holds the gripping member 43 at a predetermined position above the cutter receiving plate 71. It is gripped by 44 and fixed in the centering state.

When the rubber sheet 1 is conveyed by a predetermined amount and stopped, the support rollers 60, 61 rise to lift a predetermined portion of the rubber sheet 1 to form a erected portion 1a, and the rubber sheet retainers 64b on the upstream and downstream sides thereof. , 65b are projected to hold the rubber sheet 1 and pull the erected portion 1a to both sides to bring it into a tensioned state (see FIG. 6).

When the round blade cutter 30 is lowered in this state,
Since the round blade cutter 30 is centered, the blade tip accurately bites into a predetermined position of the rubber sheet 1 and the outer skin of the rubber sheet is dragged by the V-shaped blade tip shape to float in the air in the erected state. The steel cord 2 embedded in the rubber sheet easily moves and avoids the cutter, bites between the adjacent steel cords 2, and the cutter receiving plate 71 is applied to the lower surface of the erected portion 1a. The bite portion is cut, and the blade edge penetrates the lower surface of the rubber sheet 1 and is threaded (see FIG. 7). Also round blade cutter
Before pressing 30 against the rubber sheet 1, the cutter support plate 71
May be applied to the lower surface of the rubber sheet 1.

Then, when the cutter receiving plate 71 is lowered to open the gripping members 43 and 44 and release the fixing of the round blade cutter 30, FIG.
As shown in FIG. 9, the blade tip of the round blade cutter 30 penetrates the erected portion 1a of the rubber sheet 1 floating in the air, and when the penetrating portion is enlarged, it is as shown in FIG.
Disconnects between adjacent steel cords 2.

The position of the round blade cutter 30 is a predetermined position near one side edge of the rubber sheet 1 when viewed from above, as shown in FIG. Here, the air motor 32 is driven to rotate the round blade cutter 30 at a high speed, and the motor 17 is driven to travel the round blade cutter 30 in the direction shown by the arrow in FIG. 10 to cut to the side edge of the rubber sheet 1. Cut one side as shown in FIG.

Since the erected portion 1a of the rubber sheet 1 is pulled on both sides and is in a tension state, the cut end is widened. Next, the motor 17 is rotated in the opposite direction to move the round blade cutter 30 to the rubber sheet 1
Run toward the other side edge of. Round blade cutter 30
Since the cutting edge of the rubber sheet 1 that is cut open and pulled to both sides is applied with the cutting edge that rotates at high speed, it is cut.
In addition to being smoothly cut, the round blade cutter 30 can freely move in a direction perpendicular to the traveling direction without receiving any external force other than the rubber sheet 1, so that even if the steel cord 2 is greatly curved, this is easy. Following the movement, the steel cord 2 also moves so as to avoid the cutter, and the rubber sheet 1 can be cut without cutting the steel cord 2.

[0036]

As described above, according to the present invention, since a round blade cutter movable in a direction perpendicular to the traveling direction of a portion of the belt-shaped rubber member which is floating in the erected state travels while cutting the belt-shaped rubber member, it is buried. The steel cord avoids the round-blade cutter, and the round-blade cutter easily follows the steel cord and freely moves, even if the bent steel cord is greatly curved, and the belt-shaped rubber member is moved along the steel cord. Can be cut.

Further, by fixing the round blade cutter at a predetermined position when the blade is passed through by providing the centering means, it is possible to accurately cut a desired portion of the belt-shaped rubber member.

[Brief description of drawings]

FIG. 1 is a plan view of a cutting device according to an embodiment of the present invention.

FIG. 2 is a side view of a main part of the cutting device.

FIG. 3 is a front view of the same.

FIG. 4 is a schematic rear view of the same.

FIG. 5 is a schematic front view of a main part when a rubber sheet is conveyed.

FIG. 6 is a schematic front view of a main part of a state where a part of a rubber sheet is lifted.

FIG. 7 is a schematic front view of a main part when a blade is threaded.

FIG. 8 is a schematic front view of an essential part when the cutter receiving plate is lowered.

FIG. 9 is an enlarged view of the relevant part.

FIG. 10 is a schematic plan view showing a blade passing position of a round blade cutter.

FIG. 11 is a schematic plan view showing a state where a round blade cutter cuts open one side edge of a rubber sheet.

FIG. 12 is a schematic plan view showing a state when a round blade cutter cuts a rubber sheet.

[Explanation of symbols]

1 ... rubber sheet, 2 ... steel cord, 10 ... cutting device,
11 ... Transport roller, 12 ... Horizontal support member, 13 ... LM guide,
14 ... slider, 15 ... travel support member, 16 ... bracket,
17 ... motor, 18 ... sprocket, 19 ... bracket, 20 ...
Bearings, 21 ... sprocket, 22 ... chain, 25 ... boss, 26
… Arm member, 27… Cutter bracket, 28… Spline shaft, 29… Ball spline, 30… Round blade cutter, 31…
Mounting member, 32 ... Air motor, 33, 34 ... Timing pulley, 35 ... Timing belt, 36 ... Tube, 37 ... Bracket, 38 ... Bearing, 39 ... Pin, 40 ... Cylinder, 41 ... Pin, 42 ... Spindle, 43, 44 ... Gripping member, 45, 46 ... Gripping plate, 47
… Cylinder, 48… Pin, 49,50… Link member, 51,52
… Pins, 60, 61… Support rollers, 62… Roller receiving members, 6
3, 64, 65 ... Cylinder, 66, 67 ... Support plate, 70 ... Cylinder rod, 71 ... Cutter support plate.

Claims (4)

[Claims] 1. A step of conveying a strip-shaped rubber member in which a steel cord is oriented substantially in a width direction and embedded in the longitudinal direction, the step of stopping the strip-shaped rubber member at a predetermined position, and a predetermined portion of the strip-shaped rubber member at the longitudinal direction. With respect to the step of applying tension to the belt-shaped rubber member between the front and rear support portions having a constant front and rear width, a round blade cutter from above to the erected portion in the tension applied state between the front and rear support portions of the belt-shaped rubber member. A step of descending in a posture along the steel cord, applying a cutter receiver from below and passing the round blade cutter through the belt-shaped rubber member, and retreating the cutter receiver to move the round blade cutter in a direction perpendicular to the traveling direction. A method of cutting a strip-shaped rubber member containing a steel cord, comprising the step of moving the strip-shaped rubber member in a cutting direction of a blade in a freely movable state to cut the strip-shaped rubber member. 2. A centering step of fixing the round blade cutter movable in a direction perpendicular to the traveling direction to a central position before the step of passing the blade, and cutting the belt-shaped rubber member after the blade passing. The method for cutting a strip-shaped rubber member containing a steel cord according to claim 1, further comprising a step of releasing the fixing of the round blade cutter before the step. 3. A conveyor that conveys a strip-shaped rubber member in which a steel cord is oriented substantially in the width direction and is embedded in the lengthwise direction, and a strip-shaped rubber member that is arranged at a predetermined position of the conveyor and has a constant width in the front-rear direction. A tension applying means for applying a tension to the belt-shaped rubber member by the front and rear supporting portions, and a circular blade cutter in a direction perpendicular to the traveling direction above the erected portion in the tension applied state between the front and rear supporting portions of the belt-shaped rubber member. Traveling means for movably supporting and traveling along the steel cord, cutter elevating means for lowering the round blade cutter to cut the round blade cutter into the strip-shaped rubber member, and rotating means for rotating the round blade cutter And a cutter receiver elevating means for raising the cutter receiver at a predetermined position below the erected portion of the belt-shaped rubber member and applying the cutter receiver to the lower surface of the belt-shaped rubber member. Cutting device steel cords strip rubber member, characterized in that there was e. 4. A centering means for moving the round blade cutter in a direction perpendicular to the traveling direction and for fixing or releasing the round blade cutter at a predetermined center position. Item 3. A device for cutting a strip-shaped rubber member containing a steel cord according to Item 3.