JPS596775B2 - Strap cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a strap cutting device, and more particularly to a strap cutting device that automatically and reliably cuts a strap loosely tied to an object having an uneven surface.

Conventionally, straps have been cut manually using scissors or wedges, but these methods require the lower blade or wedge of the scissors to be inserted between the strap and the object to be tied. In this case, it was unavoidable to damage the objects to be bound.

Moreover, these operations are often carried out on poor footing, which poses safety problems, and the operations themselves are extremely inefficient, and at the same time extremely painful for the workers. Therefore, in order to solve these problems,
Several strap cutting devices have been proposed.

For example, as described in Japanese Unexamined Patent Publication No. 53-87898, a wedge-shaped cutting edge is inserted between a strap and an object at an oblique angle using a hydraulic cylinder, or
As described in the specification of No. 25518, there is a type in which a flat blade is pressed down perpendicularly to the strap. There are also some that apply vibration to the wedge-shaped cutting edge when inserting it. However, these types have the disadvantage that the objects to be bound are inevitably damaged and the product yield is unavoidably reduced. Furthermore, with conventional devices, the strap may not be cut reliably, and there are many cases where the strap is not cut within the travel stroke of the cutting edge.

Furthermore, there was a problem that the cutting end timing was inaccurate, making it impossible to ensure the safety of surrounding workers. In addition, vibration-type cutting devices inevitably generate noise.
In addition, the conventional apparatus had to be large in size, and therefore it had to be difficult to arrange the apparatus.
In addition, since it was not possible to self-detect the strap, there were differences in the size and shape of the items to be tied, as well as differences in the binding position, etc.
Depending on the number of binding straps, it was necessary for the operator to visually confirm the position of the straps and align the cutting edge with that position.

Therefore, it is not possible to automatically cut a plurality of binding straps in sequence. In view of this point, the original inventor has devised various techniques,
As a result of studies and experiments, it was found that the problem could be solved by using a device that incorporates a rotating blade and a mechanism that senses the presence of the strap itself and cuts only the strap using the rotating blade. .

The strap cutting device in which the rotary blade is driven under pressure without being driven is as previously proposed by the applicant (see Japanese Patent Application No. 54-5809 and Japanese Patent Application Laid-Open No. 55-101315). . However, as further studies were carried out at the practical stage, it was found that the non-driven rotary blade was somewhat insufficient for the purpose of reliably cutting the straps without damaging the objects to be bound.

In other words, when a relatively soft strap is tied to a highly rigid object, less pressure is applied to the rotary blade, and the surface of the object will not be damaged after cutting. On the other hand, if a relatively hard strap is tied to an object with relatively low rigidity, the pressure of the rotating blade will inevitably increase, and as a result, there will be a tendency to cause some damage to the surface of the object. : A problem arose. As a result of various studies to solve the above-mentioned problems, the inventors of the present invention have discovered that the pressure applied to the rotary blade can be significantly reduced by driving the rotary blade itself as a milling cutter or a rotary grindstone. I have already proposed this device.

However, all of the conventional strap automatic cutting devices described so far are intended only for cases where the straps are tightly tied to the object to be tied, and when the straps are loose, they are Since no frictional force is exerted between the objects to be bound and the straps are pushed and moved by the claws, cutting becomes difficult or impossible.

This loose state of the straps is caused by thermal contraction of the hot-rolled coil, for example, when the hot-rolled coil is rolled up at a temperature of 600 to 800°C, tied together with the straps, and then allowed to cool naturally. t)s, and may also occur in cold-rolled coils due to vibrations, shocks, etc. during transportation, and the reality is that there are surprisingly many cases of this happening.

On the other hand, when the surface of the object to be bound is smooth, the conventional strap pinning cutting device can sufficiently detect the edge of the binding strap with its claws and automatically cut the strap reliably. However, in the case of objects to be bound that have severe unevenness, such as the end of a hot-rolled coil with a relatively poor shape, the claws cannot engage the edge of the strap, and there are many cases where detection and cutting of the strap fails. .

As a result of intensive research, the inventors of the present invention have combined a serrated strap stopper with a scissor-shaped cutting head having a lower blade whose tip slides in contact with the surface of a minute object to be bound. We have discovered that it is possible to reliably automatically cut not only tight binding straps bound in multiple strips on the surface of objects to be bound that have uneven and uneven surfaces, but also loose binding straps.
The present invention has now been completed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a strap cutting device that can reliably and automatically cut a plurality of binding straps tied tightly or loosely to objects having uneven and uneven surfaces.

According to the present invention, the swing stop is pivoted to a support member parallel to the surface of the object to be bound, one end is pivotally connected to the support member, and the other end is biased by an elastic body so as to press against the surface of the object to be bound. a strap stopper having one or more claws, a lower blade having one end pivotally attached to the lower part of the sliding member and the other end being pressed against the surface of the object to be bound by being biased by its own weight or an elastic body; The slide is provided with an upper blade that is pressurized by a cylinder and descends and engages with the lower blade to cut the binding strap, and is movable along the surface of the object to be bound in the width direction of the binding strap by a moving mechanism. A strap cutting device is provided comprising a cutting head comprising a moving member.

The present invention will be explained in detail below using Examples.

FIG. 1 is an overall perspective view showing an embodiment of the present invention. In FIG. 1, a coil 2 whose outer periphery is tied with a strap 1 is conveyed to a cutting device 4 by conveyors 3, 3. In FIG. The cutting device 4 includes a machine frame 5, a hydraulic cylinder 6 mounted vertically on the machine frame, and two guide rods 8 that are vertically slidable by bearings 7, 7 fixed to the machine frame. , 8, a piston rod 9 of the hydraulic cylinder 6, and a cutting head 10 which is attached to the tips of the two guide rods and can be moved up and down perpendicularly to the coil surface. FIG. 2 is a front view showing the state in which the cutting head 10 is in contact with the surface of the coil 2, and the bottom legs of the frame 11 are made of wood or hard nylon, etc., except for the area where strap stoppers are attached, which will be described later. A buffer body 12 made of synthetic resin is attached.

Further, a strap stopper 50 having a plurality of swing stop claws 19 is attached to the center of the bottom surface of the frame 11. FIG. 3 is a cross-sectional view of FIG. 2, showing the internal structure of the cutting head 10.

In FIG. 3, there is a ball screw 14 inside the frame 11.
A sliding member 20 is provided which is moved in the front-rear direction by ball nuts 16, 16. The ball screw 14 is rotatably supported at both ends by ball bearings 15, 15, and its shaft end is connected to the air motor 13. The sliding member 20 has running wheels 21, 21, 21, 21, and rails 17, 17 attached to the inner wall of the frame 11.
Although it can be moved horizontally by being guided by, it is fixed vertically. FIG. 4 is a cross-sectional view of FIG. 2, showing a cross section of the cutting head 10.

A strap stopper 50 consisting of buffer bodies 12, 12 and a plurality of swing stop claws 19 is attached to both legs of the bottom surface of the frame 11.

Rails 17, 17 are fixed to both sides of the inner wall of the frame 11. Running wheels 21, 21, 21, 21 are attached to both sides of the casing 22 of the sliding member 20, and the sliding member 20 is guided by the rails 17, 17. The shock absorbers 12, 12 soften the shock when the cutting head 10 contacts the surface of the coil 2, and
serves to determine the height position of the cutting head 10 relative to the surface of the cutting head 10. A cylinder 26 is attached to the upper part of the casing 22.

Furthermore, inside the casing 22 there is an elevator 23 having an inverted U-shaped cross section, and is fixed to the lower end of the piston 27 of the cylinder 26 . The elevator has a lifting guide wheel 24.
, 24, 24, 24 are attached, and the inside of the casing 22 can be moved up and down by the working stroke of the piston 27. Further, a knife mount 25 is attached to the lower part of the elevator 23. The knife mount 25
An upper blade 30 and a lower blade guide 29 are attached by bolts 31 so as to hold the blade mount 25 from both sides. FIG. 5 is a sectional view of the sliding member 20. In FIG. 5, the wedge-shaped lower blade 32 has, at its rear end,
It is pivotally connected by a pin 33 so that it can swing. Further, the lower blade 32 is always pressed downward by a ram 38 biased by a spring 39, so that the tip of the lower blade 32 is always in contact with the coil surface with the pin 33 as the center of rotation. It is pressed downward. A strap detection dog 34 is attached inside the lower blade 32.

The dog 34 has an elongated hole and can slide against the lower blade 32 by means of pins 35 and 36. Further, the dog 34 is always pressed in the direction of the cutting edge with respect to the lower blade 32 by the spring 37, and is positioned in front of the lower blade 32. A limit switch 40 is attached to the rear of the blade mount 25, and the dog 34 is pushed back by the edge of the strap to operate the limit switch lever. FIG. 6 is a partially sectional front view of the strap stopper 50 described above.

A plurality of swing stop claws 19 are pivotally supported by a support member 42 by a husband pin 18 so as to be swingable. The swing stop pawl 19 is always given a force in the upright direction by a torsion helical spring 41. That is, the upper end of the swing stop claw 19 is pivotally connected to the support member 42 by a pin 18, and the lower end of the swing stop claw 19 is connected to the surface of the coil 2 by a metal torsion helical spring 41. It is biased so that it comes into pressure contact with the

Similar swing stop claws 19 are arranged in pairs on the left and right, and in large numbers. That is, the strap stop, which is a part of the device of the present invention, is composed of multiple pairs of swing stop claws 19, pins 18, springs 41, and support members 42, and is attached to the lower part of the frame 11 by mounting bolts 49. It is attached firmly. Generally, at this stage, the strap 1 is not yet engaged with the lower end of the swing stopper 19. The swing stop claws 19 are inclined at different angles according to the unevenness of the surface of the coil 2, and their lower ends are in pressure contact with the coil surface. As mentioned above, the swing stop claws are arranged in multiple pairs in the strap width direction.
It is desirable that the lower blade 32 is arranged in a row and moves between the plurality of pairs of swing stop claws.

However, in order to simplify the device, the strap stopper can have a pair of swing stop claws, or two or even one strap stopper in a row. However, if you make a pair of straps, the positional allowance in the width direction of the straps will be smaller, and if you make two straps in a row, the positional allowance will increase accordingly, but you will lose the ability to prevent the straps from twisting, so if the straps are loose, cutting will be uncertain. become. Furthermore, if only one is used, the positional allowance will be small, and prevention of twisting will be difficult if the lower blade and the stop pawl are not on a straight line. However, if the strap is tight, one swing stopper is sufficient. Cutting head 10
A sliding member 20 that moves inside the strap in the width direction of the strap.
When the tip of the wedge-shaped lower blade 32 provided at the bottom of the elevator 23 slides along the coil surface and comes into contact with the loose strap 1, the strap 1 is pushed by the lower blade 32 and moves to the left in Figure 5. However, one end of the strap 1 is connected to the swing stop claw 1.
9 and are engaged, the swing stop claws 19 are unable to move upward, so they are pressed down even more firmly against the coil surface and firmly prevent the strap 1 from moving.

FIG. 7 is a front partial cross-sectional view of the main part of the sliding member showing the lowered state. Then, the tip of the lower blade 32 enters the underside of the strap 1 and lifts the strap 1 onto the upper surface of the wedge. Thereafter, the upper blade 30 descends and the strap is cut. Further details of these operations are as follows.

First, in FIG. 3, when compressed air is supplied to the air motor 13 and the air motor rotates, the ball screw. 14 rotates, and the ball nuts 16, 16 advance the sliding member 20 in the direction of the arrow. At this time, the tip of the lower blade 32 slides on the coil surface while swinging somewhat depending on the unevenness of the coil surface. Next, as shown in FIG. 5, when the tip of the lower blade 32 hits the edge of the strap 1 tied to the surface of the coil 2,
A horizontal movement resistance force is applied to the tip of the lower blade 32, making it easier for the tip of the lower blade 32 to slip under the strap 1.

When the lower blade 32 moves further forward, the lower blade 32 is inserted between the surfaces of the strap 1 and the coil 2 and lifts the strap 1, as shown in FIG. 7, which is a sectional view of the main part of the sliding member.

When the lower blade 32 moves further forward, the strap 1 is completely attached to the lower blade 32, as shown in FIG. 8, which is a sectional view of the main part of the sliding member.
It is scooped up and moves along the upper surface (cutting surface) of the lower blade 32.

At this time, the end edge of the strap 1 comes into contact with the dog 34, and the dog 34 is pushed back as far as the elongated hole of the dog 34 and the pin 35 allow, against the force of the compression spring 37. As a result, the dog 34
The rear end operates the lever of the limit switch 40,
Emit a "strap detection signal". limit switch 4
The "strap detection signal" of 0 activates the control circuit, switches the solenoid valve that operates the air cylinder piston 27 of the sliding member 20, and as shown in FIG. 9, which is a cross-sectional view of the entire sliding member, the piston 27 operate downward. Piston 2
7 is caused by the elevator 2 fixed to the piston 27.
3 and a knife mount 2 fixed to the elevator 23
5 and the upper blade 30 attached to the blade mount 25
and lower the lower blade guide 29. This downward stroke is regulated by the lower surfaces of the upper blade 30 and lower blade guide 29 reaching the surface of the coil 2 before the piston 27 of the cylinder 26 reaches the stroke end. Moreover, this downward movement vertically pushes down the pin 33 fixed to the upper blade 30 and the lower blade guide 29, while the tip of the lower blade 32 is pushed up relatively from below by the surface of the coil 2, so in the end, The lower blade 32 rotates clockwise around the pin 33, and performs a scissor-like shearing motion with the upper blade 30. That is, the 10th diagram is a sliding member operation diagram.
As shown in FIGS. 11 and 12, the strap 1 is sheared between the upper blade 30 and the lower blade 32 to separate it. When the strap cutting operation is completed through the above operations, the piston 27 is
rises and returns to the state shown in FIG. Note that if multiple straps are tied to the same object, these straps can be cut in succession, or the upper blade,
It is also possible to cut two or three straps at the same time by changing the size of the lower blade.

In addition, the air motor 13 in the above embodiment may be an electric motor or a hydraulic motor, the entire horizontal movement mechanism for the sliding member may be a combination of a hydraulic cylinder mechanism or a chain link mechanism, or a vertical lowering mechanism may be used. It goes without saying that the air cylinder 26 (in this embodiment) can also be replaced with other mechanical mechanisms.

By carrying out the present invention detailed above, all the objects of the present invention can be achieved and the following effects can be obtained.

That is, (1) it is possible to reliably and automatically cut a binding strap loosely tied to an object to be bound that has an uneven and uneven surface;

(2) Multiple binding straps can be cut sequentially or almost simultaneously.

(3) It is also possible to cut binding straps that are tied tightly to the surface of objects to be bound that have uneven or uneven surfaces.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of an embodiment of the present invention, Fig. 2 is a front view of the cutting head, Fig. 3 is a sectional view taken along line I-1' in Fig. 2, and Fig. 4 is a -5 sectional view taken in Fig. 2. , FIG. 5 is an overall sectional view of the sliding member, FIG. 6 is a partially sectional front view of the strap stopper, and FIG.
8 is a sectional view of the main part of the sliding member, FIG. 9 is an overall sectional view of the sliding member, and FIGS. 10, 11, and 12 are sectional views of the sliding member. FIG. 3 is a front view showing the operation of the main parts of the moving member. 1...Strap, 2...Coil, 3
... Conveyor, 4 ... Cutting device, 5.
... Machine frame, 6 ... Fluid pressure cylinder, 7.
...Bearing, 8...Guide rod, 9...
・Piston rod, 10... Cutting head, 11
...Frame, 12...Buffer, 13
... Air motor, 14 ... Ball screw, 15 ... Ball bearing, 16 ... Ball nut, 17 ... Rail, 18 ... ... Pin, 19 ... Swing stop claw, 20 ... Sliding member, 21 ... Traveling wheel, 22 ... Casing, 23 ... ...Elevator, 24...
・・Elevating guide wheel, 25 ・・Knife mounting stand, 26・
...Air cylinder, 27...Piston,
28...Spacer, 29...Lower blade guide, 30...Upper blade, 31...Bolt,
32... lower blade, 33... pin, 34...
...Dog, 35...Pin, 36...
...Pin, 37...Spring, 38...Ram, 39...Spring, 40...Limit switch, 41...Twisted spiral winding Spring, 42・
...Supporting member, 49...Bolt, 50.
...Straps and Tsunoma.

Claims (1)

[Claims] 1. One end is pivotally attached to a support member parallel to the surface of the object to be bound, and the other end is urged by an elastic body so as to press against the surface of the object to be bound. a strap stopper having one or more swing stop claws; a lower blade having one end pivotally attached to the lower part of the sliding member and the other end being urged by its own weight or an elastic body to press against the surface of the object to be bound; The upper blade is pressurized by a fluid pressure cylinder and lowered to engage with the lower blade to cut the binding strap, and is movable along the surface of the object to be bound in the width direction of the binding strap by a moving mechanism. A strap cutting device comprising: a cutting head comprising the above-mentioned sliding member. 2. The strap cutting device according to claim 1, wherein the moving mechanism comprises an air motor, a ball screw, a rail, and wheels.