JP2003117883A - Log brake in log cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a log brake capable of precisely and easily adjusting force for braking a log, and preventing the damage of the log or a machine even when a log having a large diameter is sent. SOLUTION: This log cutter intermittently sends a log L to a cutter knife 14 along a carrying passage, and cuts the log L into roll products P of a specified measurement by the cutter knife 14. A log brake mechanism is composed of a long and thin pressing plate 30 provided on the carrying passage and extending along the carrying passage, and a pressing device 40 pressing the pressing plate 30 against the log L. The contacting area between the log L and the pressing plate 30 is made to be large, so that the pressing plate 30 can brake the log L without damaging and breaking a surface of the log L.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a log brake in a log cutting machine.

[0002]

2. Description of the Related Art A conventional log cutting machine is disclosed in Japanese Patent Laid-Open No. 4-2.
There is one described in Japanese Patent Publication No. 09156, but the basic structure thereof will be described based on FIG. 7. In the figure, reference numeral 14 denotes two cutter knives, which are attached to a rotary shaft 13 rotatably provided at the tip of the rotor arm 11, and when the rotary shaft 13 is rotated by a motor or the like, it rotates at high speed. It is like this. Rotor arm 11 is axis 1
It is rotatable around 2 and can be rotated by a motor or the like. Therefore, the cutter knife 14 revolves around its own axis. Further, in FIG.
Indicates a feed conveyor for intermittently feeding the log L toward the cutter knife 14. The feed conveyor 10 is provided with a flight 15. By pushing the log L from the rear end (the right end in FIG. 7) by the flight 15, the log L can be sent to the cutter knife 14 at a constant feed amount. . Therefore, since the log L can be cut by the cutter knife 14 that rotates while revolving while intermittently feeding the log L by the feed conveyor 10, the log L is finished into a roll product P such as toilet paper or kitchen roll paper. You can

However, when the log L is sent by the flight 15 of the feed conveyor 10, the log L pushed by the flight 15 is excessively pushed out by the inertia of the log L itself and a gap is created between the flight 15 and the log L. Occurs, the feed amount of the log L is deviated, and the product length of the roll product P is deviated. Therefore, in order to prevent the log L from being excessively pushed out by the flight 15, a log brake is provided above the feed conveyor 10.

This log brake is a plate 101 curved in a J shape, one end of which is fixed to a machine frame or the like, and the outer surface of the curved portion is separated from the upper surface of the feed conveyor 10 by a certain distance. It is located in. Therefore, the log L is
When passing between the plate 101 and the feed conveyor 10,
Since the log L can be pressed against the feed conveyor 10 by 101 and the brake can be applied, it is possible to prevent the log L pressed by the flight 15 from being excessively pushed out by the inertia of the log L itself.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, the log brake in the conventional log cutting machine has the following (1) to (1).
There is a problem of (4). (1) Since the log L has a cylindrical shape, the contact area between the plate 101 and the log L is very small, and even if the force of pressing the log L downward by the plate 101 is small, the surface pressure of the contact portion is large. Therefore, there is a problem that the log L is easily broken. (2) The force of pressing the log L against the feed conveyor 10 by the plate 101 is adjusted by the distance between the curved portion of the plate 101 and the upper surface of the feed conveyor 10. Therefore, in the case of the log L having a diameter slightly larger than this distance, the plate 101 can effectively suppress the log L. However, when the log L having a diameter considerably larger than this distance is supplied, the force of pressing the log L by the plate 101 becomes too large, and the paper on the surface of the log L is torn or the end face of the log L is crushed. However, when the log L having a diameter smaller than this distance is supplied, a gap is created between the log L and the plate 101, and the log L cannot be braked. (3) If the distance between the curved portion of the plate 101 and the feed conveyor 10 is adjusted according to the diameter of the log L to be cut, the brake can be applied with an optimum pressing force for each log L. Since it is fixed to the machine frame or the like, adjusting the height is troublesome and there is a problem that the operating efficiency is reduced. (4) When the logs L manufactured by a plurality of winders are supplied, even if the logs L having the same diameter are manufactured, the diameters of the logs L manufactured by the winders supplied are slightly different. Therefore, it is practically impossible to adjust the height for each log L.

In view of the above situation, the present invention can accurately and easily adjust the force for braking the log, and can prevent the log and the machine from being damaged even if a log having a large diameter is sent. The purpose is to provide a log brake in a cutting machine.

[0007]

A log brake in a log cutting machine according to claim 1, wherein a log is intermittently fed toward a cutter knife along a conveying path, and the log is a roll product having a predetermined size. In the log cutting machine for cutting to, a log brake mechanism for applying a brake to the log is provided, the log brake mechanism is provided above the transport path, and an elongated pressing plate extending along the transport path, And a pressing device for pressing the pressing plate against the log. According to a second aspect of the present invention, there is provided a log brake according to the first aspect of the present invention, wherein the pressing plate is formed in a gutter shape having an opening downward in a cross-sectional view. The log brake in the log cutting machine according to claim 3 is the invention according to claim 1 or 2, wherein the pressing device includes a pressing force adjusting portion for adjusting a force for pressing the pressing plate against the log. . According to a fourth aspect of the present invention, in the log brake in the log cutting machine according to the first, second or third invention, the pressing force adjusting portion includes an air cylinder. It is characterized by moving to. The log brake in the log cutting machine according to claim 5,
The invention according to claim 1, 2, 3 or 4, wherein the pressing device includes a pressing arm which is provided so as to be vertically swingable and to which the pressing plate is attached in an appropriate position, and the pressing force adjusting unit includes: A pin attached to the pressing arm and a stopper provided below the pin so as to be adjustable in vertical height are provided, and when the pin comes into contact with the stopper, the swing arm swings downward. Is stopped. The log brake in the log cutting machine according to claim 6 is the invention according to claim 1, 2, 3, 4 or 5, wherein when the log brake mechanism sends a log having a diameter larger than a predetermined diameter, the log is fed. An emergency stop unit for stopping the rotation of the pressure plate, the emergency stop unit swinging in response to the up-and-down movement of the pressing plate, an angle detector for detecting the swing angle of the detection arm, and the angle. When the detection amount detected by the detector exceeds a predetermined amount, it is determined to be abnormal, and an abnormality determiner that stops the feeding of the log is featured.

According to the first aspect of the present invention, the log can be pressed against the conveying path by moving the pressing plate downward by the pressing device, so that the log can be braked. Moreover, since the pressing plate makes line contact with the upper peripheral surface of the log along the longitudinal direction thereof, the contact area between the log and the pressing plate becomes large. Therefore, the force applied to the log can be dispersed, and the contact surface pressure between the log and the pressing plate can be reduced. Therefore, the log can be braked by the pressing plate without damaging or breaking the surface of the log. According to the invention of claim 2, the contact area between the log and the pressing plate can be further increased. Moreover, since the pressing plate has a gutter shape having an opening downward in a cross-sectional view, the log to be conveyed is
It can be supported from both sides with respect to the central axis of the log.
Therefore, the log can be reliably supported, and the log can be prevented from shifting to the left or right when the brake is applied. According to the invention of claim 3, the force for pressing the pressing plate against the log can be adjusted according to the diameter of the log to be conveyed, so that the log can be braked with an optimum force. According to the invention of claim 4, since the pressing plate can be moved upward by extending the air cylinder, the pressing plate can be pressed against the log. Further, by adjusting the pressure applied to the piston side air chamber and the rod side air chamber of the air cylinder, the force of pressing the pressing plate against the log can be adjusted accurately and easily according to each log. Furthermore, when the pressure plate comes into contact with the log, even if the force that pushes up the pressure plate is applied,
Since the air cylinder contracts and absorbs the force, the impact generated on the log and the machine during log transportation can be reduced, and the log and the machine can be prevented from being damaged. Further, since the air cylinder is used, even if the log diameter varies, the pressing plate can be pressed against the logs with a substantially constant force for all the logs. According to the invention of claim 5, when the pressing plate moves downward, the pressing arm swings downward, but when the pin provided on the pressing arm contacts the stopper, the downward swinging of the swinging arm is stopped. To be done. That is, the downward movement of the pressing plate is stopped. Therefore, when the pressing plate contacts the upper peripheral surface of the log,
If the height of the stopper is adjusted so that the stopper is located slightly below the pin, even if the pressing device malfunctions and the force pressing the pressing plate downward becomes too strong, the pressing plate presses the log. You can limit your power,
It is possible to prevent the pressing plate and the log from being damaged. According to the invention of claim 6, when the log is sent, the pressing plate moves up and down according to the diameter of the log, so that the detection arm swings in accordance with the lifting operation of the pressing plate. The swing angle of the detection arm is detected by the angle detector, and when the detected amount exceeds a predetermined amount, the abnormality determiner determines that there is an abnormality and stops the log feed. Therefore, when a log having a diameter larger than the predetermined diameter is sent, it can be determined that the log is abnormal and damage to the log and the machine can be prevented.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. The log brake 20 of the present embodiment is
This is a device for preventing the log L from moving excessively by the feed conveyor 10, but before describing the log brake 20 of the present embodiment, the log brake 20 of the present embodiment is described.
A log cutting machine to which is applied will be described.

FIG. 1 is a side view of a log cutting machine to which the log brake 20 of this embodiment is applied. In the figure, reference numeral 14 denotes two cutter knives, which are attached to a rotary shaft 13 rotatably provided at the tip of the rotor arm 11, and when the rotary shaft 13 is rotated by a motor or the like, it rotates at high speed. It is like this. The rotor arm 11 is rotatable around a shaft 12 and is rotated by a motor or the like. Therefore, the cutter knife 14 revolves around its own axis. Further, in FIG. 1, reference numeral 10 indicates a feed conveyor for intermittently feeding the log L toward the cutter knife 14. The feed conveyor 10 is provided with a flight 15. By pushing the log L from the rear end (the right end in FIG. 1) by the flight 15, the log L can be sent to the cutter knife 14 at a constant feed amount. . This feed conveyor 10
Shows the transport path referred to in the claims. Therefore, since the log L can be cut by the cutter knife 14 that rotates while revolving while intermittently feeding the log L by the feed conveyor 10, the log L is finished into a roll product P such as toilet paper or kitchen roll paper. You can

Now, the log brake 20 of this embodiment will be described. FIG. 4 is a schematic explanatory diagram of the log brake 20.
As shown in FIG. 1 and FIG. 4, the log brake 20 of the present embodiment includes a pressing plate 30, a pressing device 40, and an emergency stop unit 70. The log L is pressed against the transported log L to brake the log L.

First, the pressing plate 30 will be described. FIG. 2A is a schematic vertical sectional view of the log brake 20 of the present embodiment,
(B) is a schematic front view of the log brake 20 of the present embodiment. 3A is an enlarged front view of the pressing plate 30, and FIG. 3B is an enlarged front view of another pressing plate 30. As shown in FIGS. 1 to 3, a pressing plate 30 is provided above the log L placed on the feed conveyor 10. This pressing plate 30 is
It is an elongated member that extends in the longitudinal direction of the log L and is arranged horizontally. The pressing plate 30 includes an upper plate 31 and an upper plate 3.
1 is formed of a pair of side plates 32, 32 formed on both sides of the first side plate 32. There is. That is, the pressing plate 30 is formed in a gutter shape having an opening downward in a cross-sectional view.

Therefore, if the pressing plate 30 is moved downward by the pressing device 40, which will be described later, the log L can be pressed against the feed conveyor 10, so that the log L can be braked. Further, since the pressing plate 30 extends in the feeding direction of the feeding conveyor 10 and has a gutter shape having an opening downward in a cross-sectional view, the pressing plate 30 extends along the longitudinal direction of the upper circumferential surface of the log L. Line contact at multiple points. Therefore, the contact area between the log L and the pressing plate 30 is increased, and the force applied to the log L can be dispersed,
Since the contact surface pressure between the log L and the pressing plate 30 can be reduced, the log L can be braked by the pressing plate 30 without damaging or breaking the surface of the log L.

Further, the pair of side plates 32, 3 of the pressing plate 30.
The log L conveyed by 2 is
Since the log L can be supported from both sides with respect to the central axis of the log L, the log L can be reliably supported, and when the brake is applied, the log L shifts left and right with respect to the feed direction. Can be prevented.

The sectional shape of the pressing plate 30 is shown in FIG.
An arcuate shape as shown in (B) or a semicircular shape whose lower surface has the same radius of curvature as the outer peripheral surface of the log L may be used, as long as the contact area with the log L is large.

As shown in FIG. 1, the rear end of the pressing plate 30 is bent upward, the reason for which will be described later.

Next, the pressing device 40 will be described. As shown in FIGS. 2 and 4, a swing shaft 42 is disposed above the pressing plate 30 so as to be horizontal and orthogonal to the feed direction of the log L by the feed conveyor 10. A bent portion of the pressing arm 41, which is substantially L-shaped in a side view, is rotatably attached to the swing shaft 42. This pressing arm 4
The lower end of 1 is rotatably attached to the front bracket 33 of the pressing plate 30 via a pin 33p. Further, behind the swing shaft 42, a detection shaft 71 of an emergency stop unit 70 described later is provided.
Are provided in parallel with the swing shaft 42, and the detection shaft 7
The upper end of the support arm 43 is rotatably attached to the shaft 1. The lower end of the support arm 43 is rotatably attached to the rear bracket 34 via a pin 34p.

At the end of the pressing arm 41 above the swing shaft 42, the tip of the piston rod of the air cylinder 45 is rotatably attached. The cylinder body of the air cylinder 45 is rotatably attached to a machine frame (not shown).

Therefore, when the air cylinder 45 is expanded and contracted, the upper end of the pressing arm 41 is swung back and forth about the swing shaft 42, so that the lower end of the pressing arm 41 is swung by the swing shaft 4.
It swings up and down with 2 as a fulcrum. Therefore, by expanding and contracting the air cylinder 45, the pressing plate 30 can be moved up and down.

FIG. 5 is a schematic explanatory view of the pressing force adjusting portion.
As shown in FIGS. 4 and 5, a pin 61 is horizontally attached to the side surface of the pressing arm 41. Further, as shown in FIGS. 2A and 5, a stopper 62 is provided on the side of the pressing arm 41. The stopper 62 is a member having an L shape in a side view, and is arranged such that a portion between the bent portion and one end thereof (hereinafter referred to as a support portion 62b) is located below the pin 61. . The stopper 62 is rotatably attached to the swing shaft 42 between its bent portion and the other end. Stopper 6
The upper end of 2 has a long hole along the longitudinal axis direction of the upper end.
62h is formed. This slot 62h has this slot
A pin 67p of a nut 67 is inserted slidably along 62h. The nut 67 is screwed onto a screw shaft 65 provided parallel to the feed direction of the log L by the feed conveyor 10, and a handle 66 is provided at one end of the screw shaft 65.
Is attached.

Therefore, when the handle 66 is rotated,
The nut 67 moves along the screw shaft 65. Then, the pin 67p of the nut 67 moves the upper end portion of the stopper 62 back and forth about the swing shaft 42 as a fulcrum, so that the support portion 62b of the stopper 62 swings up and down about the swing shaft 42 as a fulcrum.

With the above-mentioned configuration, the pressing device 4
According to 0, the air cylinder 45 is expanded and contracted to push the pressing plate 30.
Can be moved up and down, the air cylinder 4
The pressing plate 30 can be pressed against the log L by moving the pressing plate 30 downward by 5.

Further, the pressing plate 3 is provided by the air cylinder 45.
0 is pressed against the log L, and this pressing force is the difference between the air pressures applied to the piston side air chamber and the rod side air chamber of the air cylinder. Therefore, if the pressure applied to the piston side air chamber and the rod side air chamber of the air cylinder 45 is adjusted, the force pressing the pressing plate 30 against the log L can be adjusted accurately and easily according to each log L. ..

Further, since the support portion 62b of the stopper 62 is located below the pin 61 provided on the side surface of the pressing plate 30, even if the pressing arm 41 swings downward, it is provided to the pressing arm 41. When the pin 61 is brought into contact with the support portion 62b of the stopper 62, the downward swing of the swing arm 41 is stopped. That is, the downward movement of the pressing plate 30 is stopped by the support portion 62b of the stopper 62, so that even if the pressing device 40 fails, the pressing plate 30 can be prevented from moving below a certain height. it can. Therefore, since the force with which the pressing plate 30 presses the log L can be limited, it is possible to prevent the pressing plate 30 and the log L from being damaged. The air cylinder 45, the pin 61, the stopper 62, the screw shaft 65, the handle 66 and the nut 67.
Configures the pressing force adjusting portion as claimed in the claims.

Next, the emergency stop unit 70 will be described. Figure 6
7A and 7B are enlarged views of the emergency stop unit 70, in which FIG. As shown in FIGS. 2B and 6, a detection shaft 71 is disposed above the pressing plate 30 in parallel with the swing shaft 42 of the pressing device 40. A base end of a detection arm 72 is fixed to the detection shaft 71. The base end of a pin 72p is horizontally attached to the side surface of the tip of the detection arm 72. This pin 72p is
The tip is provided so as to contact the upper surface of the support arm 43. Although not shown, the detection arm 72
The pin 72p and the support arm 43 are connected by a weak connecting spring or the like so that the pin 72p and the support arm 43 are not separated from each other by a certain length or more.

An angle detector 75 such as an encoder is attached to one end of the detection shaft 71.
The angle detector 75 is connected to the abnormality determiner 76. The abnormality determiner 76 is for detecting the signal output by the angle detector 75 and stopping the feed conveyor 10 to stop the feeding of the log L when the value becomes a certain value or more.

Next, the function and effect of the log brake 20 of this embodiment will be described. First, the handle 66 is rotated to swing the support portion 62b of the stopper 62 up and down, and when the pressing plate 30 comes into contact with the upper peripheral surface of the log L to be cut, the support portion 62b of the stopper 62 is pinned. The height of the support portion 62b of the stopper 62 is adjusted so that it is positioned slightly below 61. Next, the pressure applied to the piston side air chamber and the rod side air chamber of the air cylinder 45 is adjusted to adjust the force for pressing the pressing plate 30 against the log L to an optimum value. Then, one end of the pressing arm 41 swings downward, and the pin 61 of the pressing arm 41 moves to the stopper 62.
The pressing plate 30 is stopped by hitting the supporting portion 62b, and is held at a position separated from the upper surface of the feed conveyor 10 by a predetermined distance, and the preparation for cutting the log L is completed.

When the log L is intermittently fed by the feed conveyor 10, the log L eventually comes into contact with the rear end of the pressing plate 30. When the log L is further sent, the log L enters below the pressing plate 30 while pushing up the pressing plate 30 with its tip. Then, since the log L is pressed against the feed conveyor 10 by the pressing plate 30, the pressing amount adjusting device 40 can brake the log L.

As described above, since the rear end of the pressing plate 30 is bent upward, the lower surface thereof is an inclined surface which is inclined downward toward the front end. Therefore, when the log L enters below the pressing plate 30, the upper end of the log L is guided to the inclined surface, so that the log L can smoothly enter below the pressing plate 30.

Moreover, when the log L comes into contact with the pressing plate 30, the pressing plate 30 is moved forward and obliquely upward by the log L (see FIG. 6).
However, since the force is absorbed by the air cylinder 45 via the pressing arm 41, the impact generated on the log L and the machine can be reduced, and the log L and the machine are It can be prevented from being damaged. Further, since the air cylinder is used, even if the log diameter varies, the pressing plate can be pressed against the logs with a substantially constant force for all the logs.

When the diameter of the log L to be cut is changed, the handle 66 is rotated to adjust the height of the support portion 62b of the stopper 62 so that the piston-side air chamber and the rod-side air of the air cylinder 45 are adjusted. By adjusting the pressure applied to the chamber, the force for pressing the pressing plate 30 against the log L can be adjusted to an optimum value, and the safety function against the failure of the pressing device 40 can be ensured. That is, since the pressing force of the pressing plate 30 can be easily adjusted, the adjustment time is short and simple. Therefore, it is possible to reliably prevent the log and the machine from being damaged, and it is possible to improve the operation efficiency.

As shown in FIG. 6, when the pressing plate 30 moves upward, the support arm 43 swings upward. However, since the pin 72p of the detection arm 72 is in contact with the upper surface of the support arm 43, detection is performed. The arm 72 swings upward, and the detection shaft 7
1 rotates. The rotation amount of the detection shaft 71 is determined by the encoder 7
5, the encoder 75 sends a signal corresponding to the rotation amount to the abnormality detector 76. Therefore, if the diameter of the transported log L is larger than the predetermined diameter, the pressing plate 30 is moved largely upward, so that the swing amount of the detection arm 72 is increased and the rotation angle of the detection shaft 71 is also increased. growing. Then, since the value of the signal transmitted from the encoder 75 to the abnormality detector 76 becomes a certain value or more, the abnormality detector 76 stops the feeding of the log L by the feed conveyor 10, and therefore the log L is pressed by the pressing plate. Thirty
Since it does not enter below, it is possible to prevent damage to the flight 15, the pressing plate 30, the cutter knife 14 and the like, and to secure work safety.

With the configuration as described above, the log brake in the log cutting machine of this embodiment can accurately and easily adjust the force for braking the log L, and even if the log L having a large diameter is sent. It is possible to prevent the log L and the machine from being damaged.

[0034]

According to the invention of claim 1, since the log can be braked and the contact area between the log and the pressing plate is increased, the surface of the log is not damaged or broken. The pressure plate allows the log to be braked. According to the invention of claim 2, the contact area between the log and the pressing plate can be further increased, and moreover,
It is possible to prevent the log from shifting to the left or right when the brakes are applied. According to the invention of claim 3, the force for pressing the pressing plate against the log can be adjusted according to the diameter of the log to be conveyed, so that the log can be braked with an optimum force. According to the invention of claim 4, the force for pressing the pressing plate against the log can be adjusted accurately and optimally according to each log, and even if a log having a diameter larger than a predetermined diameter is sent, It is possible to prevent the machine from being damaged. Further, since the air cylinder is used, even if the log diameter varies, the pressing plate can be pressed against the logs with a substantially constant force for all the logs. According to the invention of claim 5, even if the pressing device fails and the force for pressing the pressing plate downward becomes too strong, the force for pressing the log by the pressing plate can be limited.
It is possible to prevent the pressing plate and the log from being damaged. According to the invention of claim 6, when a log having a diameter larger than the predetermined diameter is sent, it can be judged as an abnormality and damage to the log and the machine can be prevented in advance.

[Brief description of drawings]

FIG. 1 is a side view of a log cutting machine to which a log brake 20 of the present embodiment is applied.

2A is a schematic vertical sectional view of a log brake 20 of the present embodiment, and FIG. 2B is a schematic front view of the log brake 20 of the present embodiment.

FIG. 3 (A) is an enlarged front view of the pressing plate 30, and FIG.
It is a front enlarged view of B.

FIG. 4 is a schematic explanatory diagram of a log brake 20.

FIG. 5 is a schematic explanatory view of a pressing force adjusting device.

FIG. 6 is an enlarged view of an emergency stop unit 70, in which (A) is always and (B) is when an excessive log is detected.

FIG. 7 is a side view of a conventional log brake 101.

[Explanation of symbols]

20 log brake 30 pressure plate 40 Pressing device 41 pressing arm 61 pin 62 stopper 70 Emergency stop 72 Detection arm 75 Angle detector 76 abnormality determiner L log

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 17, 2002 (2002.12.
17)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Log brake in log cutting machine

[Claims]

Wherein said pressing device is log brake in claim 1 Symbol placement log cutting machine is characterized in that a pressing force adjustment part that adjusts the force of pressing the pressing plate to the log.

3. The log brake for a log cutting machine according to claim 2, wherein the pressing force adjusting portion includes an air cylinder, and when the air cylinder is expanded and contracted, the pressing plate moves up and down. .

Wherein said pressing device is mounted for up and down swinging, and a pressing arm which the pressing plate is mounted in position, the pressing force adjustment part includes a pin attached to said pressing arm, Below the pin, there is provided a stopper which is adjustable in vertical height, and when the pin comes into contact with the stopper, the downward swing of the swing arm is stopped. The log brake in the log cutting machine according to claim 2 .

Wherein said log brake mechanism, when it was sent large log than a predetermined diameter, equipped with a emergency stop unit stopping the feed of the log, the emergency stop is vertical movement of the pressing plate Detection arm that swings according to the angle, an angle detector that detects the swing angle of the detection arm, and if the detected amount detected by the angle detector exceeds a predetermined amount, it is determined to be abnormal, and the log log brake in claim 1 Symbol placement log cutting machine characterized by comprising the abnormality determiner for stopping the feed.

Detailed Description of the Invention

[000]

TECHNICAL FIELD The present invention relates to a log brake in a log cutting machine.

[000]

2. Description of the Related Art A conventional log cutting machine is disclosed in Japanese Patent Laid-Open No. 4-2.
There is one described in Japanese Patent Publication No. 09156, but the basic structure thereof will be described based on FIG. 7. In the figure, reference numeral 14 denotes two cutter knives, which are attached to a rotary shaft 13 rotatably provided at the tip of the rotor arm 11, and when the rotary shaft 13 is rotated by a motor or the like, it rotates at high speed. It is like this. Rotor arm 11 is axis 1
It is rotatable around 2 and can be rotated by a motor or the like. Therefore, the cutter knife 14 revolves around its own axis. Further, in FIG.
Indicates a feed conveyor for intermittently feeding the log L toward the cutter knife 14. The feed conveyor 10 is provided with a flight 15. By pushing the log L from the rear end (the right end in FIG. 7) by the flight 15, the log L can be sent to the cutter knife 14 at a constant feed amount. . Therefore, since the log L can be cut by the cutter knife 14 that rotates while revolving while intermittently feeding the log L by the feed conveyor 10, the log L is finished into a roll product P such as toilet paper or kitchen roll paper. You can

However, when the log L is sent by the flight 15 of the feed conveyor 10, the log L pushed by the flight 15 is excessively pushed out by the inertia of the log L itself and a gap is created between the flight 15 and the log L. Occurs, the feed amount of the log L is deviated, and the product length of the roll product P is deviated. Therefore, in order to prevent the log L from being excessively pushed out by the flight 15, a log brake is provided above the feed conveyor 10.

This log brake is a plate curved in a J shape.
101, one end of which is fixed to a machine frame or the like, and the outer surface of the curved portion is arranged at a position separated from the upper surface of the feed conveyor 10 by a certain distance. Therefore, the log L is
When passing between the 101 and the feed conveyor 10, the plate 10
Since the log L can be pressed against the feed conveyor 10 by 1 and the brake can be applied, the log L pressed by the flight 15 can be prevented from being excessively pushed out by the inertia of the log L itself.

[000]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, the log brake in the conventional log cutting machine has the following (1) to (1).
There is a problem of (3). (1) Since the log L has a cylindrical shape, the contact area between the plate 101 and the log L is very small, and even if the force of pressing the log L downward by the plate 101 is small, the surface pressure of the contact portion is large. Therefore, there is a problem that the log L is easily broken. (2) The force of pressing the log L against the feed conveyor 10 by the plate 101 is adjusted by the distance between the curved portion of the plate 101 and the upper surface of the feed conveyor 10. Therefore, in the case of the log L having a diameter slightly larger than this distance, the plate 101 can effectively suppress the log L. However, when the log L having a diameter considerably larger than this distance is supplied, the force of pressing the log L by the plate 101 becomes too large, and the paper on the surface of the log L is torn or the end face of the log L is crushed. However, when the log L having a diameter smaller than this distance is supplied, a gap is created between the log L and the plate 101, and the log L cannot be braked. (3) If the distance between the curved portion of the plate 101 and the feed conveyor 10 is adjusted according to the diameter of the log L to be cut, the brake can be applied with an optimum pressing force for each log L. Since it is fixed to the machine frame or the like, adjusting the height is troublesome and there is a problem that the operating efficiency is reduced. (4) When the logs L manufactured by a plurality of winders are supplied, even if the logs L having the same diameter are manufactured, the diameters of the logs L manufactured by the winders supplied are slightly different. Therefore, it is practically impossible to adjust the height for each log L.

In view of the above circumstances, the present invention can accurately and easily adjust the force for braking the log, and can prevent the log and the machine from being damaged even if a log having a large diameter is sent. The purpose is to provide a log brake in a cutting machine.

[000]

A log brake in a log cutting machine according to claim 1, wherein a log is intermittently fed toward a cutter knife along a conveying path, and the log is a roll product having a predetermined size. In the log cutting machine for cutting into, a log brake mechanism for braking the log is provided, the log brake mechanism is provided above the transport path, and an elongated pressing plate extending along the transport path, Ri Na <br/> and a pressing device for pressing the pressing plate in the log, the pressing plate, gutter having an opening downward when viewed in section
It is characterized by being formed into a shape . Log brake in claim 2 log cutting machine is the invention of claim 1 Symbol mounting, the pressing device, characterized in that a pressing force adjustment part that adjusts the force of pressing the pressing plate to the log. The log brake in the log cutting machine according to claim 3 is the log brake according to claim 2.
In the invention described above, the pressing force adjusting unit includes an air cylinder, and when the air cylinder is expanded and contracted, the pressing plate moves up and down. According to a second aspect of the present invention, in the log brake of the log cutting machine according to the fourth aspect, the pressing device is provided so as to be vertically swingable,
A pressing arm having the pressing plate attached thereto is provided at a proper position, and the pressing force adjusting portion includes a pin attached to the pressing arm and a stopper provided below the pin and adjustable in vertical height. When the pin comes into contact with the stopper, the downward swing of the swing arm is stopped. Log brake in log cutting machine according to claim 5 is the invention of claim 1 Symbol placement, the log brake mechanism, when a large log sent from a predetermined diameter, an emergency stop unit for stopping the feed of the log The emergency stop unit is provided with a detection arm that swings in accordance with a lifting operation of the pressing plate, an angle detector that detects a swing angle of the detection arm, and a detection detected by the angle detector. When the amount exceeds a predetermined amount, it is determined to be abnormal, and an abnormality determiner that stops the sending of the log is featured.

According to the first aspect of the present invention, the log can be pressed against the conveying path by moving the pressing plate downward by the pressing device, so that the log can be braked. Moreover, since the pressing plate makes line contact with the upper peripheral surface of the log along the longitudinal direction thereof, the contact area between the log and the pressing plate becomes large. Therefore, the force applied to the log can be dispersed, and the contact surface pressure between the log and the pressing plate can be reduced. Therefore, the log can be braked by the pressing plate without damaging or breaking the surface of the log. In addition, the pressing plate is
Since it has a gutter shape with an opening,
On the upper peripheral surface, support from both sides with respect to the central axis of the log
You can Therefore, be sure to support the log.
When the brakes are applied, the log will shift to the left and right
Can be prevented. According to the invention of claim 2, the force for pressing the pressing plate against the log can be adjusted according to the diameter of the log to be conveyed, so that the log can be braked with an optimum force. Claim
According to the third aspect of the invention, since the pressing plate can be moved upward by extending the air cylinder, the pressing plate can be pressed against the log. Further, by adjusting the pressure applied to the piston side air chamber and the rod side air chamber of the air cylinder, the force of pressing the pressing plate against the log can be adjusted accurately and easily according to each log. Further, even if a force that pushes up the pressing plate is applied when the pressing plate and the log come into contact with each other, the air cylinder contracts and absorbs the force, so the impact generated on the log and the machine during log transportation is reduced. It is possible to prevent the log and the machine from being damaged. Further, since the air cylinder is used, even if the log diameter varies, the pressing plate can be pressed against the logs with a substantially constant force for all the logs. According to the invention of claim 4 , when the pressing plate moves downward, the pressing arm swings downward, but when the pin provided on the pressing arm contacts the stopper, the downward swing of the swinging arm is stopped. To be done. That is, the downward movement of the pressing plate is stopped. Therefore, if the height of the stopper is adjusted so that the stopper is positioned slightly below the pin when the pressing plate comes into contact with the upper peripheral surface of the log, the pressing device malfunctions and the pressing plate is damaged. Even if the downward pressing force becomes too strong, the pressing plate can limit the pressing force of the log, so that the pressing plate and the log can be prevented from being damaged. According to the invention of claim 5 , when the log is sent, the pressing plate moves up and down in accordance with the diameter of the log, so that the detection arm swings in accordance with the lifting operation of the pressing plate.
The swing angle of the detection arm is detected by the angle detector, and when the detected amount exceeds a predetermined amount, the abnormality determiner determines that there is an abnormality and stops the log feed. Therefore, when a log having a diameter larger than the predetermined diameter is sent, it can be determined that the log is abnormal and damage to the log and the machine can be prevented.

[000]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. The log brake 20 of the present embodiment is
This is a device for preventing the log L from moving excessively by the feed conveyor 10, but before describing the log brake 20 of the present embodiment, the log brake 20 of the present embodiment is described.
A log cutting machine to which is applied will be described.

FIG. 1 is a side view of a log cutting machine to which the log brake 20 of this embodiment is applied. In the figure, reference numeral 14
Is two cutter knives and is attached to a rotary shaft 13 rotatably provided at the tip of the rotor arm 11. When the rotary shaft 13 is rotated by a motor or the like,
It is designed to rotate at high speed. Rotor arm 11
Is rotatable about a shaft 12, and is rotated by a motor or the like. Therefore, the cutter knife 14 revolves around its own axis. Further, in FIG. 1, reference numeral 10 indicates a feed conveyor for intermittently feeding the log L toward the cutter knife 14. This feed conveyor 10
Flight 15 is provided in this Flight 15
By pushing the log L from the rear end (the right end in FIG. 1) with the cutter L 1 with a constant feed amount.
Can be sent to 4. The feed conveyor 10 represents the transport path referred to in the claims. Therefore, since the log L can be cut by the cutter knife 14 that rotates while revolving while intermittently feeding the log L by the feed conveyor 10, the log L is finished into a roll product P such as toilet paper or kitchen roll paper. You can

Now, the log brake 20 of this embodiment will be described. FIG. 4 is a schematic explanatory diagram of the log brake 20. Figure 1
As shown in FIG. 4 and FIG. 4, the log brake 2 according to the present embodiment.
0 is the pressing plate 30, the pressing device 40, and the emergency stop 7
0, and the pressing plate 40 is pressed by the pressing device 40.
0 is pressed against the log L conveyed by the feed conveyor 10 to brake the log L.

First, the pressing plate 30 will be described. FIG. 2A is a schematic vertical sectional view of the log brake 20 of the present embodiment, and FIG.
FIG. 3 is a schematic front view of the log brake 20 of the present embodiment.
3A is an enlarged front view of the pressing plate 30, and FIG. 3B is an enlarged front view of another pressing plate 30. As shown in FIGS. 1 to 3, a pressing plate 30 is provided above the log L placed on the feed conveyor 10. The pressing plate 30 is an elongated member extending in the longitudinal direction of the log L and is horizontally arranged. The pressing plate 30 is composed of an upper plate 31 and a pair of side plates 32, 32 formed on both sides of the upper plate 31. It is inclined downwards from both ends. That is, the pressing plate 30 is formed in a gutter shape having an opening downward in a cross-sectional view.

Therefore, if the pressing plate 40 is moved downward by the pressing device 40 described later, the log L is fed to the conveyor 1.
Since it can be pressed against 0, the log L can be braked. Further, since the pressing plate 30 extends in the feeding direction of the feeding conveyor 10 and has a gutter shape having an opening downward in a cross-sectional view, the pressing plate 30 extends along the longitudinal direction of the upper circumferential surface of the log L. Line contact at multiple points. For this reason, the contact area between the log L and the pressing plate 30 becomes large, the force applied to the log L can be dispersed, and the contact surface pressure between the log L and the pressing plate 30 can be made small. The log L can be braked by the pressing plate 30 without damaging or breaking the surface of the log L.

Further, the pair of side plates 32, 32 of the pressing plate 30 can support the log L to be conveyed from both sides with respect to the central axis of the log L on the upper peripheral surface thereof, so that the log L can be securely held. Thus, when the brake is applied, the log L can be prevented from shifting to the left or right with respect to the feed direction.

The cross-sectional shape of the pressing plate 30 may be a circular shape as shown in FIG. It is sufficient that the contact area with the log L is large.

As shown in FIG. 1, the rear end of the pressing plate 30 is bent upward, the reason for which will be described later.

Next, the pressing device 40 will be described. As shown in FIGS. 2 and 4, a swing shaft 42 is disposed above the pressing plate 30 so as to be horizontal and orthogonal to the feed direction of the log L by the feed conveyor 10. This swing shaft 42
The bent portion of the pressing arm 41, which is substantially L-shaped when viewed from the side,
It is rotatably attached. The lower end of the pressing arm 41 is attached to the front bracket 3 of the pressing plate 30 via the pin 33p.
It is rotatably attached to 3. In addition, the swing shaft 42
Behind the, the detection shaft 71 of the emergency stop unit 70 described later,
It is provided in parallel with the swing shaft 42, and the upper end of the support arm 43 is rotatably attached to the detection shaft 71. The lower end of the support arm 43 is rotatably attached to the rear bracket 34 via a pin 34p.

In the pressing arm 41, the swing shaft 42
The tip of the piston rod of the air cylinder 45 is rotatably attached to the upper end of the cylinder. The cylinder body of the air cylinder 45 is rotatably attached to a machine frame (not shown).

Therefore, if the air cylinder 45 is expanded and contracted,
Since the upper end of the pressing arm 41 swings back and forth about the swing shaft 42 as a fulcrum, the lower end of the pressing arm 41 swings up and down about the swing shaft 42 as a fulcrum. Therefore, by expanding and contracting the air cylinder 45, the pressing plate 30 can be moved up and down.

FIG. 5 is a schematic explanatory view of the pressing force adjusting portion. Figure 4
Further, as shown in FIG. 5, a pin 61 is horizontally attached to the side surface of the pressing arm 41. Also, FIG.
As shown in (A) and FIG. 5, a stopper 62 is provided on the side of the pressing arm 41. This stopper 6
Reference numeral 2 denotes a member having an L shape in a side view, and is arranged such that a portion between the bent portion and one end thereof (hereinafter referred to as a support portion 62b) is located below the pin 61. The stopper 62 is rotatably attached to the swing shaft 42 between its bent portion and the other end. Stopper 62
At the upper end of the long hole 62 along the longitudinal axis direction of the upper end.
h 1 is formed. This long hole 62h has this long hole 62h.
A pin 67p of a nut 67 is inserted slidably along h 1. The nut 67 is screwed onto a screw shaft 65 provided parallel to the feed direction of the log L by the feed conveyor 10, and a handle 66 is attached to one end of the screw shaft 65.

Therefore, when the handle 66 is rotated, the nut 67 moves along the screw shaft 65. Then, the pin 67p of the nut 67 moves the upper end portion of the stopper 62 back and forth about the swing shaft 42 as a fulcrum, so that the support portion 62b of the stopper 62 swings up and down about the swing shaft 42 as a fulcrum.

With the above-mentioned structure, the pressing device 40 can move the pressing plate 30 up and down by expanding and contracting the air cylinder 45. Therefore, the pressing plate 30 is moved downward by the air cylinder 45. As a result, the pressing plate 30 can be pressed against the log L.

The pressing plate 30 is pressed against the log L by the air cylinder 45, and this pressing force is the difference between the air pressures applied to the piston side air chamber and the rod side air chamber of the air cylinder. Therefore, if the pressure applied to the piston side air chamber and the rod side air chamber of the air cylinder 45 is adjusted,
The force for pressing the pressing plate 30 against the log L can be adjusted accurately and easily according to each log L.

Further, the pin 6 provided on the side surface of the pressing plate 30.
Since the supporting portion 62b of the stopper 62 is located below 1, the pin 61 provided on the pressing arm 41 does not move the supporting portion of the stopper 62 even if the pressing arm 41 swings downward.
When 62b comes into contact, the downward swing of the swing arm 41 is stopped. That is, the downward movement of the pressing plate 30 is stopped by the support portion 62b of the stopper 62, so that even if the pressing device 40 fails, the pressing plate 30 can be prevented from moving below a certain height. it can. Therefore, since the force with which the pressing plate 30 presses the log L can be limited, it is possible to prevent the pressing plate 30 and the log L from being damaged. The air cylinder 45, the pin 61, and the stopper 6 described above.
2, the screw shaft 65, the handle 66 and the nut 67,
It constitutes the pressing force adjusting portion referred to in the claims.

Next, the emergency stop unit 70 will be described. 6A and 6B are enlarged views of the emergency stop unit 70, in which FIG. 6A is always, and FIG. 6B is when an excessive log is detected. As shown in FIG. 2 (B) and FIG.
A detection shaft 71 is arranged above the pressing plate 30 in parallel with the swing shaft 42 of the pressing device 40. A base end of a detection arm 72 is fixed to the detection shaft 71.
On the side surface of the tip of the detection arm 72, the pin 72
The proximal end of p is attached. The pin 72p is provided so that its tip is in contact with the upper surface of the support arm 43. Although not shown, the pin 72p of the detection arm 72 and the support arm 43 are connected by a weak spring or the like so that the pins 72p and the support arm 43 are not separated from each other by a certain length or more.

An angle detector 75 such as an encoder is attached to one end of the detection shaft 71. The angle detector 75 is connected to the abnormality determiner 76.
The abnormality determiner 76 is for detecting the signal output by the angle detector 75 and stopping the feed conveyor 10 to stop the feeding of the log L when the value becomes a certain value or more.

Next, the function and effect of the log brake 20 of this embodiment will be described. First, the handle 66 is rotated to swing the support portion 62b of the stopper 62 up and down to push the pressing plate 30.
However, the support portion 62 of the stopper 62 is arranged so that the support portion 62b of the stopper 62 is positioned slightly below the pin 61 when it contacts the upper peripheral surface of the log L to be cut.
Adjust the height of b. Next, the pressure applied to the piston side air chamber and the rod side air chamber of the air cylinder 45 is adjusted to adjust the force for pressing the pressing plate 30 against the log L to an optimum value. Then, one end of the pressing arm 41 swings downward, the pin 61 of the pressing arm 41 hits the supporting portion 62b of the stopper 62 and stops, and the pressing plate 30 is separated from the upper surface of the feed conveyor 10 by a certain distance. Held
The preparation for disconnecting the log L is completed.

When the log L is intermittently fed by the feed conveyor 10, the log L eventually comes into contact with the rear end of the pressing plate 30. When the log L is further sent, the log L enters below the pressing plate 30 while pushing up the pressing plate 30 with its tip. Then, since the log L is pressed against the feed conveyor 10 by the pressing plate 30, the pressing amount adjusting device 40 can brake the log L.

As described above, since the rear end of the pressing plate 30 is bent upward, its lower surface is an inclined surface which is inclined downward toward the front end. Therefore, the log L becomes the pressing plate 30.
Since the upper end of the log L is guided to the inclined surface when entering the lower part of the log L, the log L can smoothly enter the lower part of the pressing plate 30.

Moreover, when the log L comes into contact with the pressing plate 30, a force is applied by the log L toward the front of the pressing plate 30 diagonally upward (upper left in FIG. 6), but the force is applied via the pressing arm 41. Since it is absorbed by the air cylinder 45, the impact generated on the log L and the machine can be reduced, and the log L and the machine can be prevented from being damaged. Further, since the air cylinder is used, even if the log diameter varies, the pressing plate can be pressed against the logs with a substantially constant force for all the logs.

Then, when the diameter of the log L to be cut is changed, the handle 66 is rotated to support the stopper 62.
By adjusting the height of 62b and adjusting the pressure applied to the piston side air chamber and the rod side air chamber of the air cylinder 45,
The force for pressing the pressing plate 30 against the log L can be adjusted to an optimum value, and a safety function against a failure of the pressing device 40 can be ensured. That is, since the pressing force of the pressing plate 30 can be easily adjusted, the adjustment time is short and simple. Therefore, it is possible to reliably prevent the log and the machine from being damaged, and it is possible to improve the operation efficiency.

As shown in FIG. 6, when the pressing plate 30 moves upward, the support arm 43 swings upward, but since the pin 72p of the detection arm 72 is in contact with the upper surface of the support arm 43, detection is performed. The arm 72 swings upward and the detection shaft 71 rotates. The rotation amount of the detection shaft 71 is detected by the encoder 75, and the encoder 75 sends a signal corresponding to the rotation amount to the abnormality detector 76. Because of this, if
When the diameter of the transported log L is larger than the predetermined diameter,
Since the pressing plate 30 is largely moved upward, the swing amount of the detection arm 72 also increases, and the rotation angle of the detection shaft 71 also increases. Then, from the encoder 75 to the abnormality detector 76
Since the value of the signal transmitted to the air conditioner becomes a certain value or more, the abnormality detector 76 stops the feeding of the log L by the feed conveyor 10, and therefore the log L does not enter below the pressing plate 30. It is possible to prevent breakage of the pressing plate 15, the pressing plate 30, the cutter knife 14 and the like, and it is possible to ensure the safety of work.

With the configuration as described above, the log brake in the log cutting machine of this embodiment can accurately and easily adjust the force for braking the log L, and even if the log L having a large diameter is sent. It is possible to prevent the log L and the machine from being damaged.

[00]

According to the invention of claim 1, since the log can be braked and the contact area between the log and the pressing plate is increased, the surface of the log is not damaged or broken. The pressure plate allows the log to be braked. In addition, the contact area between the log and the pressure plate is reduced.
Can be made large, and with the brake applied
In this case, you can prevent the log from shifting left and right.
It According to the invention of claim 2, the force for pressing the pressing plate against the log can be adjusted according to the diameter of the log to be conveyed, so that the log can be braked with an optimum force. According to the invention of claim 3, the force for pressing the pressing plate against the log can be adjusted accurately and optimally according to each log, and even if a log having a diameter larger than the predetermined diameter is sent, It is possible to prevent the machine from being damaged. Further, since the air cylinder is used, even if the log diameter varies, the pressing plate can be pressed against the logs with a substantially constant force for all the logs. Claim 4
According to the invention of claim 1, even if the pressing device fails and the force of pressing the pressing plate downward becomes too strong, the force of the pressing plate pressing the log can be limited, so that the pressing plate and the log are prevented from being damaged. Can be prevented. According to the invention of claim 5 , when a log having a diameter larger than the predetermined diameter is sent, it can be judged as an abnormality, and damage to the log and the machine can be prevented in advance.

[Brief description of drawings]

FIG. 1 is a side view of a log cutting machine to which a log brake 20 of the present embodiment is applied.

2A is a schematic vertical sectional view of a log brake 20 of the present embodiment, and FIG. 2B is a schematic front view of the log brake 20 of the present embodiment.

FIG. 3 (A) is an enlarged front view of the pressing plate 30, and FIG.
It is a front enlarged view of B.

FIG. 4 is a schematic explanatory diagram of a log brake 20.

FIG. 5 is a schematic explanatory view of a pressing force adjusting device.

FIG. 6 is an enlarged view of an emergency stop unit 70, in which (A) is always and (B) is when an excessive log is detected.

FIG. 7 is a side view of a conventional log brake 101.

[Explanation of Codes] 20 Log brake 30 Pressing plate 40 Pressing device 41 Pressing arm 61 Pin 62 Stopper 70 Emergency stop 72 Detection arm 75 Angle detector 76 Abnormality judging device L log ──────────── ─────────────────────────────────────────

[Procedure amendment]

[Submission date] December 18, 2002 (2002.12.
18)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Log brake in log cutting machine

[Claims]

Wherein said pressing device is log brake in claim 1 Symbol placement log cutting machine is characterized in that a pressing force adjustment part that adjusts the force of pressing the pressing plate to the log.

3. The log brake for a log cutting machine according to claim 2, wherein the pressing force adjusting portion includes an air cylinder, and when the air cylinder is expanded and contracted, the pressing plate moves up and down. .

Wherein said pressing device is mounted for up and down swinging, and a pressing arm which the pressing plate is mounted in position, the pressing force adjustment part includes a pin attached to said pressing arm, Below the pin, there is provided a stopper which is adjustable in vertical height, and when the pin comes into contact with the stopper, the downward swing of the swing arm is stopped. The log brake in the log cutting machine according to claim 2 .

Wherein said log brake mechanism, when it was sent large log than a predetermined diameter, equipped with a emergency stop unit stopping the feed of the log, the emergency stop is vertical movement of the pressing plate Detection arm that swings according to the angle, an angle detector that detects the swing angle of the detection arm, and if the detected amount detected by the angle detector exceeds a predetermined amount, it is determined to be abnormal, and the log log brake in claim 1 Symbol placement log cutting machine characterized by comprising the abnormality determiner for stopping the feed.

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a log brake in a log cutting machine.

[0002]

2. Description of the Related Art A conventional log cutting machine is disclosed in Japanese Patent Laid-Open No. 4-2.
There is one described in Japanese Patent Publication No. 09156, but the basic structure thereof will be described based on FIG. 7. In the figure, reference numeral 14 denotes two cutter knives, which are attached to a rotary shaft 13 rotatably provided at the tip of the rotor arm 11, and when the rotary shaft 13 is rotated by a motor or the like, it rotates at high speed. It is like this. Rotor arm 11 is axis 1
It is rotatable around 2 and can be rotated by a motor or the like. Therefore, the cutter knife 14 revolves around its own axis. Further, in FIG.
Indicates a feed conveyor for intermittently feeding the log L toward the cutter knife 14. The feed conveyor 10 is provided with a flight 15. By pushing the log L from the rear end (the right end in FIG. 7) by the flight 15, the log L can be sent to the cutter knife 14 at a constant feed amount. . Therefore, since the log L can be cut by the cutter knife 14 that rotates while revolving while intermittently feeding the log L by the feed conveyor 10, the log L is finished into a roll product P such as toilet paper or kitchen roll paper. You can

However, when the log L is sent by the flight 15 of the feed conveyor 10, the log L pushed by the flight 15 is excessively pushed out by the inertia of the log L itself and a gap is created between the flight 15 and the log L. Occurs, the feed amount of the log L is deviated, and the product length of the roll product P is deviated. Therefore, in order to prevent the log L from being excessively pushed out by the flight 15, a log brake is provided above the feed conveyor 10.

This log brake is a plate 101 curved in a J shape, one end of which is fixed to a machine frame or the like, and the outer surface of the curved portion is separated from the upper surface of the feed conveyor 10 by a certain distance. It is located in. Therefore, the log L is
When passing between the plate 101 and the feed conveyor 10,
Since the log L can be pressed against the feed conveyor 10 by 101 and the brake can be applied, it is possible to prevent the log L pressed by the flight 15 from being excessively pushed out by the inertia of the log L itself.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, the log brake in the conventional log cutting machine has the following (1) to (1).
There is a problem of (3). (1) Since the log L has a cylindrical shape, the contact area between the plate 101 and the log L is very small, and even if the force of pressing the log L downward by the plate 101 is small, the surface pressure of the contact portion is large. Therefore, there is a problem that the log L is easily broken. (2) The force of pressing the log L against the feed conveyor 10 by the plate 101 is adjusted by the distance between the curved portion of the plate 101 and the upper surface of the feed conveyor 10. Therefore, in the case of the log L having a diameter slightly larger than this distance, the plate 101 can effectively suppress the log L. However, when the log L having a diameter considerably larger than this distance is supplied, the force of pressing the log L by the plate 101 becomes too large, and the paper on the surface of the log L is torn or the end face of the log L is crushed. However, when the log L having a diameter smaller than this distance is supplied, a gap is created between the log L and the plate 101, and the log L cannot be braked. (3) If the distance between the curved portion of the plate 101 and the feed conveyor 10 is adjusted according to the diameter of the log L to be cut, the brake can be applied with an optimum pressing force for each log L. Since it is fixed to the machine frame or the like, adjusting the height is troublesome and there is a problem that the operating efficiency is reduced. (4) When the logs L manufactured by a plurality of winders are supplied, even if the logs L having the same diameter are manufactured, the diameters of the logs L manufactured by the winders supplied are slightly different. Therefore, it is practically impossible to adjust the height for each log L.

In view of the above situation, the present invention can accurately and easily adjust the force for braking the log, and can prevent the log and the machine from being damaged even if a log having a large diameter is sent. The purpose is to provide a log brake in a cutting machine.

[0007]

A log brake in a log cutting machine according to claim 1, wherein a log is intermittently fed toward a cutter knife along a conveying path, and the log is a roll product having a predetermined size. In the log cutting machine for cutting into, a log brake mechanism for braking the log is provided, the log brake mechanism is provided above the transport path, and an elongated pressing plate extending along the transport path, Ri Na <br/> and a pressing device for pressing the pressing plate in the log, the pressing plate, gutter having an opening downward when viewed in section
It is characterized by being formed into a shape . Log brake in claim 2 log cutting machine is the invention of claim 1 Symbol mounting, the pressing device, characterized in that a pressing force adjustment part that adjusts the force of pressing the pressing plate to the log. The log brake in the log cutting machine according to claim 3 is the log brake according to claim 2.
In the invention described above, the pressing force adjusting unit includes an air cylinder, and when the air cylinder is expanded and contracted, the pressing plate moves up and down. According to a second aspect of the present invention, in the log brake of the log cutting machine according to the fourth aspect, the pressing device is provided so as to be vertically swingable,
A pressing arm having the pressing plate attached thereto is provided at a proper position, and the pressing force adjusting portion includes a pin attached to the pressing arm and a stopper provided below the pin and adjustable in vertical height. When the pin comes into contact with the stopper, the downward swing of the swing arm is stopped. Log brake in log cutting machine according to claim 5 is the invention of claim 1 Symbol placement, the log brake mechanism, when a large log sent from a predetermined diameter, an emergency stop unit for stopping the feed of the log The emergency stop unit is provided with a detection arm that swings in accordance with a lifting operation of the pressing plate, an angle detector that detects a swing angle of the detection arm, and a detection detected by the angle detector. When the amount exceeds a predetermined amount, it is determined to be abnormal, and an abnormality determiner that stops the sending of the log is featured.

According to the first aspect of the present invention, the log can be pressed against the conveying path by moving the pressing plate downward by the pressing device, so that the log can be braked. Moreover, since the pressing plate makes line contact with the upper peripheral surface of the log along the longitudinal direction thereof, the contact area between the log and the pressing plate becomes large. Therefore, the force applied to the log can be dispersed, and the contact surface pressure between the log and the pressing plate can be reduced. Therefore, the log can be braked by the pressing plate without damaging or breaking the surface of the log. In addition, the pressing plate is
Since it has a gutter shape with an opening in the
Supports from both sides with respect to the central axis of the log on the upper circumferential surface
can do. Therefore, firmly support the log
And when the brakes are applied, the log will not
It is possible to prevent getting drunk. According to the invention of claim 2, the force for pressing the pressing plate against the log can be adjusted according to the diameter of the log to be conveyed, so that the log can be braked with an optimum force. According to the invention of claim 3 , since the pressing plate can be moved upward by extending the air cylinder, the pressing plate can be pressed against the log. Further, by adjusting the pressure applied to the piston side air chamber and the rod side air chamber of the air cylinder, the force of pressing the pressing plate against the log can be adjusted accurately and easily according to each log. Further, even if a force that pushes up the pressing plate is applied when the pressing plate and the log come into contact with each other, the air cylinder contracts and absorbs the force, so the impact generated on the log and the machine during log transportation is reduced. It is possible to prevent the log and the machine from being damaged. Further, since the air cylinder is used, even if the log diameter varies, the pressing plate can be pressed against the logs with a substantially constant force for all the logs.
According to the invention of claim 4 , when the pressing plate moves downward, the pressing arm swings downward, but when the pin provided on the pressing arm contacts the stopper, the downward swing of the swinging arm is stopped. To be done. That is, the downward movement of the pressing plate is stopped. Therefore, if the height of the stopper is adjusted so that the stopper is positioned slightly below the pin when the pressing plate comes into contact with the upper peripheral surface of the log, the pressing device malfunctions and the pressing plate is damaged. Even if the downward pressing force becomes too strong, the pressing plate can limit the pressing force of the log, so that the pressing plate and the log can be prevented from being damaged. According to the invention of claim 5 , when the log is sent, the pressing plate moves up and down in accordance with the diameter of the log, so that the detection arm swings in accordance with the lifting operation of the pressing plate.
The swing angle of the detection arm is detected by the angle detector, and when the detected amount exceeds a predetermined amount, the abnormality determiner determines that there is an abnormality and stops the log feed. Therefore, when a log having a diameter larger than the predetermined diameter is sent, it can be determined that the log is abnormal and damage to the log and the machine can be prevented.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. The log brake 20 of the present embodiment is
This is a device for preventing the log L from moving excessively by the feed conveyor 10, but before describing the log brake 20 of the present embodiment, the log brake 20 of the present embodiment is described.
A log cutting machine to which is applied will be described.

FIG. 1 is a side view of a log cutting machine to which the log brake 20 of this embodiment is applied. In the figure, reference numeral 14 denotes two cutter knives, which are attached to a rotary shaft 13 rotatably provided at the tip of the rotor arm 11, and when the rotary shaft 13 is rotated by a motor or the like, it rotates at high speed. It is like this. The rotor arm 11 is rotatable around a shaft 12 and is rotated by a motor or the like. Therefore, the cutter knife 14 revolves around its own axis. Further, in FIG. 1, reference numeral 10 indicates a feed conveyor for intermittently feeding the log L toward the cutter knife 14. The feed conveyor 10 is provided with a flight 15. By pushing the log L from the rear end (the right end in FIG. 1) by the flight 15, the log L can be sent to the cutter knife 14 at a constant feed amount. . This feed conveyor 10
Shows the transport path referred to in the claims. Therefore, since the log L can be cut by the cutter knife 14 that rotates while revolving while intermittently feeding the log L by the feed conveyor 10, the log L is finished into a roll product P such as toilet paper or kitchen roll paper. You can

Now, the log brake 20 of this embodiment will be described. FIG. 4 is a schematic explanatory diagram of the log brake 20.
As shown in FIG. 1 and FIG. 4, the log brake 20 of the present embodiment includes a pressing plate 30, a pressing device 40, and an emergency stop unit 70. The log L is pressed against the transported log L to brake the log L.

First, the pressing plate 30 will be described. FIG. 2A is a schematic vertical sectional view of the log brake 20 of the present embodiment,
(B) is a schematic front view of the log brake 20 of the present embodiment. 3A is an enlarged front view of the pressing plate 30, and FIG. 3B is an enlarged front view of another pressing plate 30. As shown in FIGS. 1 to 3, a pressing plate 30 is provided above the log L placed on the feed conveyor 10. This pressing plate 30 is
It is an elongated member that extends in the longitudinal direction of the log L and is arranged horizontally. The pressing plate 30 includes an upper plate 31 and an upper plate 3.
1 is formed of a pair of side plates 32, 32 formed on both sides of the first side plate 32. There is. That is, the pressing plate 30 is formed in a gutter shape having an opening downward in a cross-sectional view.

Therefore, if the pressing plate 30 is moved downward by the pressing device 40, which will be described later, the log L can be pressed against the feed conveyor 10, so that the log L can be braked. Further, since the pressing plate 30 extends in the feeding direction of the feeding conveyor 10 and has a gutter shape having an opening downward in a cross-sectional view, the pressing plate 30 extends along the longitudinal direction of the upper circumferential surface of the log L. Line contact at multiple points. Therefore, the contact area between the log L and the pressing plate 30 is increased, and the force applied to the log L can be dispersed,
Since the contact surface pressure between the log L and the pressing plate 30 can be reduced, the log L can be braked by the pressing plate 30 without damaging or breaking the surface of the log L.

Further, the pair of side plates 32, 3 of the pressing plate 30.
The log L conveyed by 2 is
Since the log L can be supported from both sides with respect to the central axis of the log L, the log L can be reliably supported, and when the brake is applied, the log L shifts left and right with respect to the feed direction. Can be prevented.

The sectional shape of the pressing plate 30 is shown in FIG.
An arcuate shape as shown in (B) or a semicircular shape whose lower surface has the same radius of curvature as the outer peripheral surface of the log L may be used, as long as the contact area with the log L is large.

As shown in FIG. 1, the rear end of the pressing plate 30 is bent upward, the reason for which will be described later.

Next, the pressing device 40 will be described. As shown in FIGS. 2 and 4, a swing shaft 42 is disposed above the pressing plate 30 so as to be horizontal and orthogonal to the feed direction of the log L by the feed conveyor 10. A bent portion of the pressing arm 41, which is substantially L-shaped in a side view, is rotatably attached to the swing shaft 42. This pressing arm 4
The lower end of 1 is rotatably attached to the front bracket 33 of the pressing plate 30 via a pin 33p. Further, behind the swing shaft 42, a detection shaft 71 of an emergency stop unit 70 described later is provided.
Are provided in parallel with the swing shaft 42, and the detection shaft 7
The upper end of the support arm 43 is rotatably attached to the shaft 1. The lower end of the support arm 43 is rotatably attached to the rear bracket 34 via a pin 34p.

At the end of the pressing arm 41 above the swing shaft 42, the tip of the piston rod of the air cylinder 45 is rotatably attached. The cylinder body of the air cylinder 45 is rotatably attached to a machine frame (not shown).

Therefore, when the air cylinder 45 is expanded and contracted, the upper end of the pressing arm 41 is swung back and forth about the swing shaft 42, so that the lower end of the pressing arm 41 is swung by the swing shaft 4.
It swings up and down with 2 as a fulcrum. Therefore, by expanding and contracting the air cylinder 45, the pressing plate 30 can be moved up and down.

FIG. 5 is a schematic explanatory view of the pressing force adjusting portion.
As shown in FIGS. 4 and 5, a pin 61 is horizontally attached to the side surface of the pressing arm 41. Further, as shown in FIGS. 2A and 5, a stopper 62 is provided on the side of the pressing arm 41. The stopper 62 is a member having an L shape in a side view, and is arranged such that a portion between the bent portion and one end thereof (hereinafter referred to as a support portion 62b) is located below the pin 61. . The stopper 62 is rotatably attached to the swing shaft 42 between its bent portion and the other end. Stopper 6
The upper end of 2 has a long hole along the longitudinal axis direction of the upper end.
62h is formed. This slot 62h has this slot
A pin 67p of a nut 67 is inserted slidably along 62h. The nut 67 is screwed onto a screw shaft 65 provided parallel to the feed direction of the log L by the feed conveyor 10, and a handle 66 is provided at one end of the screw shaft 65.
Is attached.

Therefore, when the handle 66 is rotated,
The nut 67 moves along the screw shaft 65. Then, the pin 67p of the nut 67 moves the upper end portion of the stopper 62 back and forth about the swing shaft 42 as a fulcrum, so that the support portion 62b of the stopper 62 swings up and down about the swing shaft 42 as a fulcrum.

With the above-mentioned configuration, the pressing device 4
According to 0, the air cylinder 45 is expanded and contracted to push the pressing plate 30.
Can be moved up and down, the air cylinder 4
The pressing plate 30 can be pressed against the log L by moving the pressing plate 30 downward by 5.

Further, the pressing plate 3 is provided by the air cylinder 45.
0 is pressed against the log L, and this pressing force is the difference between the air pressures applied to the piston side air chamber and the rod side air chamber of the air cylinder. Therefore, if the pressure applied to the piston side air chamber and the rod side air chamber of the air cylinder 45 is adjusted, the force pressing the pressing plate 30 against the log L can be adjusted accurately and easily according to each log L. ..

Further, since the support portion 62b of the stopper 62 is located below the pin 61 provided on the side surface of the pressing plate 30, even if the pressing arm 41 swings downward, it is provided to the pressing arm 41. When the pin 61 is brought into contact with the support portion 62b of the stopper 62, the downward swing of the swing arm 41 is stopped. That is, the downward movement of the pressing plate 30 is stopped by the support portion 62b of the stopper 62, so that even if the pressing device 40 fails, the pressing plate 30 can be prevented from moving below a certain height. it can. Therefore, since the force with which the pressing plate 30 presses the log L can be limited, it is possible to prevent the pressing plate 30 and the log L from being damaged. The air cylinder 45, the pin 61, the stopper 62, the screw shaft 65, the handle 66 and the nut 67.
Configures the pressing force adjusting portion as claimed in the claims.

Next, the emergency stop unit 70 will be described. Figure 6
7A and 7B are enlarged views of the emergency stop unit 70, in which FIG. As shown in FIGS. 2B and 6, a detection shaft 71 is disposed above the pressing plate 30 in parallel with the swing shaft 42 of the pressing device 40. A base end of a detection arm 72 is fixed to the detection shaft 71. The base end of a pin 72p is horizontally attached to the side surface of the tip of the detection arm 72. This pin 72p is
The tip is provided so as to contact the upper surface of the support arm 43. Although not shown, the detection arm 72
The pin 72p and the support arm 43 are connected by a weak connecting spring or the like so that the pin 72p and the support arm 43 are not separated from each other by a certain length or more.

An angle detector 75 such as an encoder is attached to one end of the detection shaft 71.
The angle detector 75 is connected to the abnormality determiner 76. The abnormality determiner 76 is for detecting the signal output by the angle detector 75 and stopping the feed conveyor 10 to stop the feeding of the log L when the value becomes a certain value or more.

Next, the function and effect of the log brake 20 of this embodiment will be described. First, the handle 66 is rotated to swing the support portion 62b of the stopper 62 up and down, and when the pressing plate 30 comes into contact with the upper peripheral surface of the log L to be cut, the support portion 62b of the stopper 62 is pinned. The height of the support portion 62b of the stopper 62 is adjusted so that it is positioned slightly below 61. Next, the pressure applied to the piston side air chamber and the rod side air chamber of the air cylinder 45 is adjusted to adjust the force for pressing the pressing plate 30 against the log L to an optimum value. Then, one end of the pressing arm 41 swings downward, and the pin 61 of the pressing arm 41 moves to the stopper 62.
The pressing plate 30 is stopped by hitting the supporting portion 62b, and is held at a position separated from the upper surface of the feed conveyor 10 by a predetermined distance, and the preparation for cutting the log L is completed.

When the log L is intermittently fed by the feed conveyor 10, the log L eventually comes into contact with the rear end of the pressing plate 30. When the log L is further sent, the log L enters below the pressing plate 30 while pushing up the pressing plate 30 with its tip. Then, since the log L is pressed against the feed conveyor 10 by the pressing plate 30, the pressing amount adjusting device 40 can brake the log L.

As described above, since the rear end of the pressing plate 30 is bent upward, the lower surface thereof is an inclined surface which is inclined downward toward the front end. Therefore, when the log L enters below the pressing plate 30, the upper end of the log L is guided to the inclined surface, so that the log L can smoothly enter below the pressing plate 30.

Moreover, when the log L comes into contact with the pressing plate 30, the pressing plate 30 is moved forward and obliquely upward by the log L (see FIG. 6).
However, since the force is absorbed by the air cylinder 45 via the pressing arm 41, the impact generated on the log L and the machine can be reduced, and the log L and the machine are It can be prevented from being damaged. Further, since the air cylinder is used, even if the log diameter varies, the pressing plate can be pressed against the logs with a substantially constant force for all the logs.

When the diameter of the log L to be cut is changed, the handle 66 is rotated to adjust the height of the support portion 62b of the stopper 62 so that the piston-side air chamber and the rod-side air of the air cylinder 45 are adjusted. By adjusting the pressure applied to the chamber, the force for pressing the pressing plate 30 against the log L can be adjusted to an optimum value, and the safety function against the failure of the pressing device 40 can be ensured. That is, since the pressing force of the pressing plate 30 can be easily adjusted, the adjustment time is short and simple. Therefore, it is possible to reliably prevent the log and the machine from being damaged, and it is possible to improve the operation efficiency.

As shown in FIG. 6, when the pressing plate 30 moves upward, the support arm 43 swings upward. However, since the pin 72p of the detection arm 72 is in contact with the upper surface of the support arm 43, detection is performed. The arm 72 swings upward, and the detection shaft 7
1 rotates. The rotation amount of the detection shaft 71 is determined by the encoder 7
5, the encoder 75 sends a signal corresponding to the rotation amount to the abnormality detector 76. Therefore, if the diameter of the transported log L is larger than the predetermined diameter, the pressing plate 30 is moved largely upward, so that the swing amount of the detection arm 72 is increased and the rotation angle of the detection shaft 71 is also increased. growing. Then, since the value of the signal transmitted from the encoder 75 to the abnormality detector 76 becomes a certain value or more, the abnormality detector 76 stops the feeding of the log L by the feed conveyor 10, and therefore the log L is pressed by the pressing plate. Thirty
Since it does not enter below, it is possible to prevent damage to the flight 15, the pressing plate 30, the cutter knife 14 and the like, and to secure work safety.

With the configuration as described above, the log brake in the log cutting machine of this embodiment can accurately and easily adjust the force for braking the log L, and even if the log L having a large diameter is sent. It is possible to prevent the log L and the machine from being damaged.

[0034]

According to the invention of claim 1, since the log can be braked and the contact area between the log and the pressing plate is increased, the surface of the log is not damaged or broken. The pressure plate allows the log to be braked. In addition, the contact area between the log and the pressure plate is reduced.
Can be made large, and with the brake applied
In this case, you can prevent the log from shifting left and right.
It According to the invention of claim 2, the force for pressing the pressing plate against the log can be adjusted according to the diameter of the log to be conveyed, so that the log can be braked with an optimum force. According to the invention of claim 3, the force for pressing the pressing plate against the log can be adjusted accurately and optimally according to each log, and even if a log having a diameter larger than the predetermined diameter is sent, It is possible to prevent the machine from being damaged. Further, since the air cylinder is used, even if the log diameter varies, the pressing plate can be pressed against the logs with a substantially constant force for all the logs. Claim 4
According to the invention of claim 1, even if the pressing device fails and the force of pressing the pressing plate downward becomes too strong, the force of the pressing plate pressing the log can be limited, so that the pressing plate and the log are prevented from being damaged. Can be prevented. According to the invention of claim 5 , when a log having a diameter larger than the predetermined diameter is sent, it can be judged as an abnormality, and damage to the log and the machine can be prevented in advance.

[Brief description of drawings]

FIG. 1 is a side view of a log cutting machine to which a log brake 20 of the present embodiment is applied.

2A is a schematic vertical sectional view of a log brake 20 of the present embodiment, and FIG. 2B is a schematic front view of the log brake 20 of the present embodiment.

FIG. 3 (A) is an enlarged front view of the pressing plate 30, and FIG.
It is a front enlarged view of B.

FIG. 4 is a schematic explanatory diagram of a log brake 20.

FIG. 5 is a schematic explanatory view of a pressing force adjusting device.

FIG. 6 is an enlarged view of an emergency stop unit 70, in which (A) is always and (B) is when an excessive log is detected.

FIG. 7 is a side view of a conventional log brake 101.

[Explanation of symbols] 20 log brake 30 pressure plate 40 Pressing device 41 pressing arm 61 pin 62 stopper 70 Emergency stop 72 Detection arm 75 Angle detector 76 abnormality determiner L log

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Chotaro Yamaguchi             1514 Kawanoe-cho, Kawanoe-shi, Ehime Prefecture Kawanoe             Inside Zoki Co., Ltd.

Claims (6)

[Claims] 1. A log cutting machine for intermittently feeding a log toward a cutter knife along a conveying path and cutting the log into roll products of a predetermined size by the cutter knife. A log brake mechanism for braking the log. Is provided, the log brake mechanism is provided above the conveyance path, and comprises an elongated pressing plate extending along the conveyance path, and a pressing device for pressing the pressing plate against the log. The log brake in the log cutting machine that features. 2. The log brake for a log cutting machine according to claim 1, wherein the pressing plate is formed in a gutter shape having an opening downward in a sectional view. 3. The log brake for a log cutting machine according to claim 1, wherein the pressing device includes a pressing force adjusting portion for adjusting a force for pressing the pressing plate against the log. 4. The log cutting apparatus according to claim 1, 2 or 3, wherein the pressing force adjusting unit includes an air cylinder, and when the air cylinder is expanded and contracted, the pressing plate moves up and down. Brake on the machine. 5. The pressing device is provided with a pressing arm provided so as to be vertically swingable, and the pressing plate is mounted at an appropriate position, and the pressing force adjusting portion includes a pin mounted on the pressing arm. Below the pin, there is provided a stopper that is adjustable in vertical height, and when the pin comes into contact with the stopper, the downward swing of the swing arm is stopped. The log brake in the log cutting machine according to claim 1, 2, 3, or 4. 6. The log brake mechanism comprises an emergency stop section for stopping the log feed when a log larger than a predetermined diameter is sent, and the emergency stop section moves up and down the pressing plate. Detection arm that swings according to the angle, an angle detector that detects the swing angle of the detection arm, and if the detection amount detected by the angle detector exceeds a predetermined amount, it is determined to be abnormal, and the log The log brake in the log cutting machine according to claim 1, 2, 3, 4, or 5, comprising an abnormality determiner for stopping the feeding.