JPS6237665Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a method for winding thin film strips such as synthetic resin film, paper, metal foil, etc. around a winding core, and replacing it with a new winding core when the winding is full. , relates to a cutting device for cutting thin film strips into fixed lengths.

[Prior art]

In a surface winding type winder, in order to cut a thin film strip (hereinafter referred to as a film) from a full roll and wind the cut end around a new core, the cutting blade is attached to a winding drum [hereinafter referred to as a film]. It's called a drum.]
It is widely practiced to cut the film by pressing the film against the film, using the surface of the drum as an anvil, and running the film perpendicularly to the film running direction.

As a matter of course, the cut end becomes a bias as shown in FIG. 6, and becomes a loss portion that is cut off during use.

On the other hand, when the end that becomes the bias is wound around the new core, the bias tip end a has already been wound by the bias length (l) by the time the other end 6 is wound around the new core.

Therefore, after reaching the other end b, the film roll is in a conical shape at the time when a film of normal width is to be wound, so the film is wound around a cone-shaped core as shown in Fig. 6. When the film thus obtained is unwound in the next step, the film wound on the larger diameter side of the cone in the width direction of the film is stretched, as shown in Fig. 8. The film is bent in the longitudinal direction and has a different shrinkage rate in the width direction.

Therefore, an improved cutting method was proposed in Japanese Patent Laid-Open No. 59-39656 as a means to shorten the loss portion of the bias portion and to minimize the portion where the film winding diameter changes near the winding core. There are, but
This uses a pair of cutting blades to cut the film into a V-shape as shown in Figure 9. The pair of cutting blades can run in a direction perpendicular to the film feeding direction, and can It is characterized by the fact that the matching cutting blades are spaced apart enough to avoid collision, allowing them to travel in different directions at approximately the same speed.

However, the content disclosed in the above publication merely explains the principle of V-shaped cutting, and a concrete device that can reliably perform the desired V-shaped cutting even under high-speed running has not yet been provided. However, the current situation is that there is a desire in this field for a device that can perform accurate cutting based on this principle.

[Purpose of invention]

In view of this, the present invention has been devised as a result of various studies in order to provide a new device that has been a problem for a long time. By making it possible to cut reliably and neatly in a V-shape without causing any defects such as, we aim to reduce rewinding loss and provide high-quality film rolls that do not bend or wrinkle. The idea is the goal.

[Structure of the idea]

Therefore, in a surface winding type winding machine, the present invention provides a horizontal rail parallel to the axis of the drum above the surface of the winding drum between the first winding position and the second winding position. A pair of running blocks are slidably engaged with the rail so that they can move back and forth individually, while an endless chain is disposed parallel to the rail to cut both ends of the rail. Each of the traveling blocks kept in a standby position is locked to each of the two chains extending in parallel, and active running of the chains prevents the pair of traveling blocks from colliding near the center of the rail. While the pair of brackets in the form of bent arms can be moved synchronously in opposite directions, such as approaching each other to the nearest cutting end position and moving away from each other to the cutting standby position, Cutting blades, which are symmetrically opposed to each other and whose positions are shifted back and forth in the feeding direction of the drum so as not to collide with each other, are suspended and fixed to each of the traveling blocks, and whose cutting edges are parallel to the rail. The tip of each bracket is pivotally supported through an appropriate support member so as to be able to swing toward and away from the surface, and furthermore, an elastic member is provided in the direction of pressing the cutting blade against the surface of the drum during cutting operation. a spring mechanism is provided to provide mechanical force, and the cutting blades are moved forward and backward in the feeding direction of the drum so as not to collide with each other;
The cutting blades are configured so that they run past each other and are located at a position slightly advanced beyond the widthwise center of the drum at the cutting end position, and the pair of cutting blades are locked to an endless chain. Since the cutting edge of the film corresponds to the hypotenuse of an isosceles triangle, the cutting intersection can be aligned with the center of the width of the film to minimize loss. Furthermore, since the pair of cutting blades cut the film to a point where they have bitten into each other, there is no uncut portion at all, and the cutting can be done simply by allowing the endless chain to run reversibly. It can also be used for cutting while traveling at high speeds.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figure 1 schematically shows the structure of the main parts of the winder, in which the film F is guided onto the drum 1, and the winding core 2
However, the film roll R is wound at the first winding position A, and when it is almost fully wound, it is moved to the second winding position B, and winding is continued.

During this winding, when a new winding core 2' is supplied to the first winding position, it travels along the circumferential surface of the drum 1 between the two winding positions A and B, and moves to the second winding position B. Cutting blades 3, 3 are installed at a position downstream of the first winding position A and close to the new winding core 2' for the film F being wound at the first winding position A.
, and run perpendicularly to the flow of the film F, using the drum 1 as an albin.
cut.

The structure of the cutting device including the cutting blades 3, 3 is
The following description will be given with reference to FIGS. 4 to 4. This device includes the cutting blades 3, 3, rail 4, running block 5, bracket 6, endless chain 7, and spring mechanism 12 as main components.

The rail 4 is horizontally installed above between the winding positions A and B with its longitudinal side parallel to the axis of the drum 1, and is fixed to a machine frame (not shown).

The traveling block 5 has a pair of the same shape, and the traveling block 5 having a rectangular cylinder shape is connected to the rail 4.
The rail 4 is slidably engaged with the rail 4 through rollers, and can run along the rail 4 by being pulled by chains 7, 7, which will be described later, driven by a motor.

The aforementioned endless chain 7 uses a roller chain in the illustrated example, and is disposed close to and parallel to the rail 4, but the chain 7, which is stretched directly above the rail 4, is After spanning the drive side sprocket group 27 arranged at one end, make a U-turn and pass it through the groove 4' recessed in the center of the top of the rail 4, and then connect the driven side sprocket group 27 arranged at the other end of the rail 4. It spans the sprocket group 28 and is U-turned to form an endless shape.

One of the traveling blocks 5 (the left traveling block in FIG. 2) which is in the cutting standby position has its top connected to the chain 7 stretched above, and the other traveling block 5 which is also in the cutting waiting position. , 5 have their abdomens connected to a chain 7 extending within the groove 4'.

With this structure, when the drive side sprocket group 27 is driven by the motor M and the motor M is rotated clockwise in FIG. When the rail 4 is rotated counterclockwise, it runs toward the cutting standby position at both ends of the rail 4.

The brackets 6 have a pair of the same shape, and are suspended and fixed in a cantilever manner to the lower surface of each running block 5, and are disposed approximately horizontally in the same direction as the rail 4, with arm portions _6-1. The tips of the drums are arranged symmetrically so that they face each other, and are fixed to the respective traveling blocks 5, 5 with their positions shifted back and forth in the feeding direction of the drum 1 so as not to collide with each other.

A support member for supporting the cutting blade 3 and a spring mechanism 12 that provides elastic force for pressing the cutting blade 3 against the drum 1 are provided at the tip of the bracket 6. Example 4
This will be explained below with reference to FIG.

A pin 25 is located near the tip of the bracket 6.
is attached to the pin 25, and by pivoting the intermediate corner portion of the arm rod 8, which has a substantially L-shaped plate shape, to this pin 25, the arm rod 8 can rotate around the pin 25 in a vertical plane. This arm rod 8 is connected to the arm portion 6.
- It is formed so that it can move up and down while extending further forward from ₁ .

A tension spring 26 is strung between the rear end of the arm rod 8 and a suitable location on the arm _6-1 , and the tension spring 26 is suspended in the counterclockwise direction in the drawing, that is, in the vertical direction with respect to the arm rod 7. It is provided with mechanical strength, and rotation toward the upward movement side is prevented at an appropriate position by a toggle mechanism 10, which will be described later.

A support rod 9 is attached to the tip of the arm rod 8.
1, and is hung vertically so as to be swingable in a vertical plane, and a tension spring 12 is bridged between the upper end and a suitable position in the middle of the arm rod 8.
An elastic force is given to the hanging support rod 9 in the counterclockwise direction in the drawing, that is, to swing it forward, and the stopper pin 19 provided on the arm rod 8 is used to swing it up. Further actions are being prevented.

Note that the elastic force of this tension spring 12 is the same as that of the support rod 9.
Disc cutter 3 as a cutting blade locked at the lower end of
Needless to say, by contacting the surface of the drum 1, the contact force necessary for cutting the film F is converted into a contact force.

The disc cutters 3 are arranged so that their central axes are perpendicular to the vertical plane that includes the rail 4, so that the cutting direction is parallel to the rail 4, and are attached to the lower ends of the support rods 9, respectively. As shown in FIG. 1, the cutting blades 3, 3 approach each other in the feeding direction of the drum 1 so as not to collide with each other, so that they can pass each other, and the lowest ends of the blades can move back and forth within a range that does not interfere with each other. It is preferable to install them as close together as possible.

Next, reference numeral 10 denotes a toggle mechanism, which is provided in relation to the bracket 6 and the arm rod 8;
_The element includes an arm 14 which is pivotally supported on a pin 13 attached to one tip and is swingable in a vertical plane. At the same time as the rollers 15 are assembled, a tension spring 16 is bridged between the arm rod 8 and the torque is normally applied in the clockwise direction in the figure, that is, the direction in which the rollers 15 push down the arm rod 8 into a downward movement state. I try to give.

The arm 14 is prevented from rotating in the clockwise direction by a stopper pin 17 attached to the tip of the arm _6-1 . ' to hold the arm rod 8 horizontally or in a downward-looking state, and the arm rod 8
is prevented from rotating counterclockwise by the spring 26.

In the toggle mechanism 10, if the arm 14 is forcibly rotated counterclockwise against the elastic force of the tension spring 16, the rotation angle When the tension spring 16 reaches a turning point where the arm 14 becomes compressed due to an increase in , the state is released as shown by the two-dot chain line in FIG.

In this state, the arm portions _6-1 of the brackets 6, 6
The arm 14 is in contact with the stopper pin 18 attached diagonally above the stopper pin 17, as shown by the two-dot chain line in FIG. 4, and is fixed in this position.

Therefore, as the arm 14 rotates from the state shown by the solid line to the state shown by the chain line in FIG.
Following this movement, the arm rod 8 rotates counterclockwise, and the toggle mechanism 1 is fixed at the release position.
As a result of being pressed against and fixed by the tension spring 26 against the zero roller 15, the arm rod 8 is held supine or horizontally, so the support rod 9 is held in a backward tilted state, and the cutter 3 is held on the surface of the drum 1. You will be able to make it float from the top.

FIG. 4 shows the process of bringing the toggle mechanism 10 into the released state, and FIG.
The process of bringing the two into the engaged state is shown, respectively.
The end 20 of the arm 14 is fixed at an appropriate position on the frame of the winder when the film F is moved in the direction of the arrow in FIG. 4 perpendicular to the flow of the film and reaches the cutting completion position. contacting the dog 21 that was
Thereafter, as the cutting device travels a little distance, the arm 14 is rotated counterclockwise, and the position of the spring mounting pin 22 in the arm 14 is aligned with the pin 13 at the rotation center and on the arm rod 8. When the extension of the line connecting the spring mounting pin 23 is exceeded, the direction of the torque applied by the tension spring 16 is reversed as described above, and the arm 1
4 rotates to the position shown by the two-dot chain line, that is, the position shown by the two-dot chain line in FIG.
It is pressed against it and its position is fixed.

Therefore, by moving the cutting device linearly for a predetermined length in the cutting direction, the arm rod 8 is held supine or horizontal after cutting, and the support rod 9 is held in a backward tilted position, so that the cutting blade 3 is moved to the drum. 1 It can be lifted off the surface and placed on standby for the return movement.

In order to return the cutting device placed in this state as it cuts and rewinds the film F, it is moved in the direction opposite to the direction of the arrow shown in Figure 4 and returned to the origin at the end of the rail 4. After that, it is stopped, and this position is as shown in FIG.

An actuator 24 made of a pneumatic cylinder or the like is disposed at the origin position, and is formed to function as a pressing body.
4 is pushed up clockwise about the pin 13 against the elastic force of the tension spring 16 to return it to the upright state shown by the two-dot chain line in FIG.

By doing so, it is possible to hold the arm rod 8 in a horizontal or downward position, and to hold the support rod 9 in a forward tilted state, so that the cutting blade 3 can be prepared for cutting operation.

To explain how the film F is cut by the cutting device having the configuration and operation described above, the motor M is driven to rotate the traveling blocks 5, 5 in the cutting standby position at both ends of the rail 4 in a clockwise direction. By doing so, they are allowed to run to the closest cutting end position near the center of each other without causing a collision.

When the cutting blades 3, 3 supported by the traveling blocks 5, 5 respectively reach the end face of the drum 1, the cutting blades 3, 3 come into contact with the tapered portion 1' formed on the end face of the drum 1, and the cutting blades 3, 3 are rotated clockwise. Climb up the tapered part 1' while rotating against the elastic force of the tension spring 12,
As shown by the solid line in FIG. 4, as a result of the support rod 9 floating from the stopper pin 19, the cutting blades 3, 3 are pressed against the drum by the elastic force of the spring 12, and thus the pressing force required for cutting is will come into play.

When the traveling blocks 5, 5 reach a predetermined cutting end position, the motor M is suddenly controlled.
Since the cutting blades 3, 3 are located in front of the traveling blocks 5, 5, the cutting blades 3, 3 overlap each other at the center in the width direction of the drum 1 before reaching the cutting end position. After passing each other, a sudden control is applied as described above at a position where the dog 21 has advanced a little further beyond the center in the width direction. One end 20 of the arm 14 of the toggle mechanism 10 comes into contact with the toggle mechanism 10, and the toggle mechanism 10 is in a released state, and the cutting blades 3, 3 float away from the surface of the drum 1.

The film F thus guided onto the drum 1
is cut to form a V-shape when viewed from the end of the roll R during running winding, and part C is shown in Figure 9.
As shown in , the tip end of the film F to be wound next has an M shape, and the center part of the M shape has been cut by the amount of intersection between the cutting blades 3 and 3. The end of is cut into a precise V-shape.

Cutting is completed in this way, and the drum 1
The cutting blades 3, 3 floated from the surface are caused to travel synchronously toward their respective cutting standby positions by the reverse rotation drive of the motor M, and the motor M is stopped.

The end portion of the film F cut into an M-shape is then wound onto the next new winding core 2', and any known means may be used as appropriate for this winding.

[Effect of idea]

In the present invention, the traverse drive for cutting and returning to the pair of cutting blades 3, 3 is performed by a chain mechanism that runs reversibly, so both cutting blades 3, 3 are moved at a synchronized and constant speed. It is possible to maintain a uniform V-shaped cut without bias, and it is also possible to operate at high speed, so that the film F can be reliably cut while traveling at high speed.

In addition, by making the pair of cutting blades 3, 3 travel to a position slightly beyond the center of the winding drum 1 in the machine width direction, there is no uncut material at all, thus achieving high speed V-shaped cutting. The benefits it brings in promoting automation are enormous.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a side view showing the main structure of a winding machine, FIG. 2 is a front view of a cutting device, and FIG. 3 is a cutting device. 4 and 5 are structural diagrams of the vicinity of the cutting blade. 6 to 8 are explanatory views of each state of the film cut by the conventional cutting device, and FIG. 9 is an exploded perspective view of the film cut by the example of the device of the present invention. 1... Winding drum, 2... Winding core, 3... Cutting blade, 4... Rail, 5... Running block, 6...
Bracket, 7... Endless chain, 12... Spring mechanism.

Claims (1)

[Scope of utility model registration request] In a winding machine that winds a thin film strip F around a winding core 2 that is in pressure contact with the surface of a winding drum 1 and rotates as a slave, and performs surface winding, a first winding position and a first winding position on the surface of the drum 1 are used. A rail 4 is installed horizontally parallel to the axis of the drum 1 above the two winding positions, and a pair of running blocks 5, 5 are slidably mounted on the rail 4 so as to be able to move individually back and forth. On the other hand, an endless chain 7 is disposed in parallel along the rail 4, and each of the running blocks 5, 5, which is in a cutting standby position at both ends of the rail 4, is connected to an endless chain 7 extending parallel to the rail 4.
each of the chains 7, 7 of the strip;
The active running of the chains 7, 7 causes the pair of running blocks 5, 5 to approach each other near the center of the rail 4 to the closest cutting end position that will not result in collision, and move away from each other to the cutting standby position. On the other hand, the pair of brackets 6, 6 in the form of bent arms are arranged symmetrically so that their tips face each other, and the winding drum 1 is moved so that they do not collide. The cutting blade 3, which is suspended and fixed to each of the traveling blocks 5, 5 by shifting its position back and forth in the direction, and whose cutting edge is parallel to the rail 4, can be moved toward and away from the surface of the drum 1. If possible, the brackets 6, 6 are pivotally supported via appropriate support members at the tips of the brackets 6, respectively, and an elastic force is applied to the cutting blade 3 in the direction of pressing it against the surface of the drum 1 during the cutting operation. A spring mechanism 12 is provided to apply the cutting blade 3.
are brought close to each other in the feeding direction of the drum 1 so as not to collide with each other, so that they run past each other, and at the cutting end position, the winding drums 1 are located at a position slightly advanced beyond the center in the width direction of the winding drum 1. A winder cutting device characterized by: