JP2001287195A - Method and device for feeding and cutting strip elastic sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a length of a cut strap elastic sheet is not uniform when a difference is generated in feeding speeds of a drawing means and a carrying means, a strip elastic sheet is compressed or extended, and is cut in a set length in this condition because a conventional cutting method of the strip elastic sheet carries the strip elastic sheet by supporting at two points of the drawing means and the carrying means. SOLUTION: The strip elastic sheet 1 is fed by the drawing means 16, and is guided to the carrying means 18 through a cutting means 15. A tip end of the strip elastic sheet 1 is detected by a sensor 17 for detecting a tip end of a sheet. A cutting control means 31 controls drawing speeds of the drawing means 16 and the carrying means 18, and controls timing for moving an idle roll 6 and a separating roll 8 up and down t support the strip elastic sheet 1 at one point and carry. After the drawing means and the carrying means stop, the cutting means operates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a long elastic band-shaped elastic sheet (also referred to simply as a band-shaped elastic sheet) to a designed length (also referred to as a designed length) and a cutting apparatus therefor. . For example, the present invention relates to a method and an apparatus for cutting a belt-shaped polyurethane sheet manufactured by a continuous casting method into a length designed as a cleaning blade for an electrophotographic copying machine.

[0002]

2. Description of the Related Art Conventionally, in a feed cutting method, as shown schematically in FIG.
6 '(feed roll 7' and idle roll 6 '), and is sent out onto the conveyor 2' via the cutting means 15 ', and is separated from the conveyor 2' on the conveyor 2 '. Thus, the belt-like elastic sheet 1 'is nipped and conveyed. When the belt-shaped elastic sheet 1 'has been fed by the designed length, the conveying conveyor 2' and the feeding means 16 'are stopped by a signal from a sensor (not shown) and the cutting means 1'.
The strip-shaped elastic sheet 1 'is cut to the designed length by 5'. The conveyor 2 'is restarted to send the strip-shaped elastic sheet (also referred to as a strip-shaped elastic sheet) cut to the design length to the next step, and the strip-shaped elastic sheet 1' to be cut next by the take-up means 16 '. Pull out.

[0003]

In the conventional cutting method as described above, the leading end of the strip-shaped elastic sheet has a space corresponding to the design length of the strip-shaped elastic sheet from the designated position (the position of the cutting blade). Position), the pickup means and the conveyor are stopped by a signal from a sensor or the like. The belt-shaped elastic sheet is on the feed roll and the transport conveyor, and is sandwiched between the position of the idle roll and the position of the separation roll, respectively. (The feed speed of the conveyor is usually extended at a high speed). If cut in this state, the cut strip-shaped elastic sheet (strip-shaped elastic sheet) remains distorted, and there is a problem that the length of the strip-shaped elastic sheet changes due to recovery over time. Further, when the feed roll and the conveyor are stopped by the stop signal, a time lag may occur between the two before the stop, and the strip-shaped elastic sheet may be distorted. Due to a change in the cut length, the above-described cleaning blade or the like may not satisfy the required standard.

An object of the present invention is to propose a feed cutting method and a cutting apparatus for manufacturing a strip-shaped elastic sheet having a small variation in length by cutting the strip-shaped elastic sheet in a state where it is not compressed or stretched.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a feed cutting device according to the present invention comprises a belt-like elastic sheet take-off means having a feed roll and an idle roll which come and go, a cutting blade which comes into contact with a cutting blade and a receiving blade. Cutting of a belt-shaped elastic sheet in which cutting means having a table and a conveying means having a conveying conveyor, a separation roll contacting with the conveying conveyor, and two sensors for detecting the tip of the band-shaped elastic sheet are arranged in this order. An apparatus, wherein the speed of the take-up means and the transport means is reduced by a detection signal of a first sensor,
The separation roll is in contact with the transport conveyor, the idle roll is separated, the take-off means and the transport means are stopped by a detection signal of a second sensor, the idle roll is in contact with the feed roll, Cut control means for operating the cut means is provided.

This apparatus is an apparatus for effectively carrying out the feed cutting method according to the second aspect, in which a long strip-shaped elastic sheet is nipped and taken off by a take-off means, and the strip-shaped elastic sheet is cut. It is sent to the transporting means via the cutting means, and the transporting means takes up the belt-shaped elastic sheet,
It is a device that conveys in the direction of the next process.

The take-off means is perpendicular to the transport direction,
A feed roll provided horizontally and having a variable rotation speed,
An idle roll is provided which is parallel to the feed roll and is rotatable and rotatable with respect to the feed roll. The transporting means includes a take-up conveyor arranged in the transport direction and having a variable feed speed, and a detachable and rotatable detachable roll on the take-up conveyor. Separation refers to separation and close proximity.

The two sensors attached to the transport conveyor have the first sensor and the second sensor arranged in this order in the transport direction. The position where the first sensor is attached (also referred to as a first point) is located downstream of the separation roll in the transport direction, and is determined from the position of the cutting blade by a design length (Z) of the strip-shaped elastic sheet to be cut. Is a position (Y = ZX) having an interval (Y) obtained by subtracting the length (X), and a position (also referred to as a second point) at which the second sensor is attached is determined from the position of the cutting blade as described above. This is a position having an interval corresponding to the length (Z). The predetermined length (X) is a distance traveled at a low feeding speed, and is determined by an experiment in consideration of an operation time in which the belt-like elastic sheet is sandwiched by the transport means and the belt-like elastic sheet is released by the take-up means.

In response to the detection signals from the first sensor and the second sensor, the cut control means adjusts or stops the feed speed of the take-up means and the transport means to a high or low speed and activates the cut means to operate the band-shaped elastic member. Controls operations such as cutting the sheet to the design length and sending it to the next process. This operation is repeated and cut.

[0010] Further, while the belt-shaped elastic sheet is conveyed by the cut control means, the idle roll and the feed roll, the separation roll and the conveyance roll are always held by only one of the take-up means and the conveyance means. By controlling the timing of the separation and contact of the sheet and the belt, the belt-shaped elastic sheet is not compressed or expanded (it is held at two points only when the cutting means is operated). Further, since the traveling speed is reduced immediately before stopping the transport conveyor or the like, the accuracy of the stop position can be improved.

A feed cutting method according to a second aspect of the present invention is a method of feeding and cutting a strip-shaped elastic sheet to a design length by passing a pulling means, a cutting means, and a conveying means in this order. Means for holding the belt-shaped elastic sheet, pulling it out, sending it to the conveying means via the cutting means, and further conveying the belt-shaped elastic sheet at a high speed until the tip of the belt-shaped elastic sheet reaches the position of the first sensor. Has reached the position of the first sensor,
The feeding speed of the take-up means and the transport means is reduced, and the belt-like elastic sheet is sandwiched by the transport means, and the belt-like elastic sheet is released by the take-up means. The tip is
When the position of the second sensor is reached, after the conveyance by the take-up means and the conveyance means is stopped, the cut means is operated by holding the band-shaped elastic sheet in the take-up means.

The band-like elastic sheet sandwiched by the take-up means is sent out to the carrying means via the cutting means, and is further carried by the carrying means in the direction of the next step. It is transported at a high speed until it reaches the point (to reduce the transport time).

The belt-like elastic sheet is held only by the take-up means before reaching the first point, and after reaching the first point, is held only by the transport means and released by the take-up means. The strip-shaped elastic sheet is always held at one place and conveyed without being compressed or expanded. Also, after the leading end of the belt-shaped elastic sheet reaches the first point, the carrying speed of the carrying means is low, so that the leading end reaches the second point and stops carrying by the carrying means and the taking-up means. In addition, the position accuracy at which the vehicle stops with less inertia is improved. After the conveyance is stopped, the belt-like elastic sheet is nipped by the take-up means and the conveyance means, and the cutting means is operated.
There is no stretching stress, and the length of the strip-shaped elastic sheet after cutting does not change. Subsequently, the belt-shaped elastic sheet is released by the transport means and is sent to the next step.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a cutting method and a cutting apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a side view for explaining the outline of the cutting apparatus, and FIG. 2 is a conceptual view for explaining the movement of each part in each step. 3 and 4 are flowcharts showing the operation of each step.

First, a cleaning blade for an electrophotographic copying machine, which is an example of a strip-shaped elastic sheet, will be described with reference to FIG. As shown in a front view in FIG. 6A and a side view in FIG. 6B, an elastic material such as polyurethane is formed into a long band-shaped sheet having a rectangular cross section (not shown), and the designed length is set. To form a strip-shaped elastic sheet 20, and
1 adhered.

The feed cutting device shown in FIG. 1 is provided with a cutting means 15 on the upstream side in the conveying direction (arrow x) of a conveying means 18 provided with a horizontally extending conveying conveyor 2, and an upstream side of the cutting means 15. And a control means 30 for controlling the operation of these devices is provided with a cut control means 31. The belt-shaped elastic sheet 1 is prepared by a molding machine (not shown) or wound up in a roll form and is continuously supplied to the take-up means 16. Collection means 16
The feed roll 7 is provided vertically and horizontally in the transport direction of the belt-shaped elastic sheet 1 and has a variable feed speed. The feed roll 7 is provided above the feed roll 7 and is provided in parallel with the feed roll 7. And a rotatable idle roll 6 which can be moved up and down by the robot. Lowering the idle roll 6 and sandwiching the belt-shaped elastic sheet 1 between the feed roll 7 and the feed roll 7,
The feed roll 7 is rotated and sent out in the direction of the cutting means 15. The belt-shaped elastic sheet 1 is placed on the conveyor 2 via the cutting means 15 and is conveyed in the direction of the next step (arrow x). When the idle roll 6 is lifted, the belt-shaped elastic sheet 1 is released, and it becomes difficult for the rotational force of the feed roll 7 to be transmitted to the belt-shaped elastic sheet.

The cutting means 15 is provided with a cutting blade 5 and a blade pedestal 4 which can move up and down with the band-shaped elastic sheet 1 sandwiched from above and below. The blade support 4 is provided below and adjacent to the belt-like elastic sheet 1, and the cutting blade 5 is pushed down by the elevating / lowering means 23 to cut the belt-like elastic sheet 1 according to a signal from the cut control unit 31. It does not hinder the progress of the belt-like elastic sheet 1 that rises immediately after cutting and continues.

The conveying means 18 comprises a conveying conveyor 2 suspended horizontally between pulleys, a separating roll 8 and a sensor 17.
And are attached. The conveyor 2 is a cutting means 15
Is extended from the position close to the downstream side until the next step, and the feed speed is increased by the signal of the cut control means 31.
The speed can be changed to a low speed, the belt-like elastic sheet 1 is taken off,
Transport. The separation roll 8 is supported by the lifting / lowering means 22 and can be raised / lowered by a signal from the cut control means 31 and is rotatably mounted across the transport conveyor 2. The separation roll 8 is lowered to transfer the rotational force of the transport conveyor 2 to the belt-like elastic sheet 1 with the belt-like elastic sheet 1 interposed between the belt-like elastic sheet 1 and the belt-like elastic sheet 1, and to convey the belt-like elastic sheet 1, and to rise to the belt-like form. The elastic sheet 1 is released.

The sensor 17 for detecting the leading edge of the sheet includes a first sensor 10 and a second sensor 9 which are connected to the conveyor 2.
To detect the tip of the belt-shaped elastic sheet 1. The first sensor 10 detects the leading end of the belt-shaped elastic sheet 1 picked up by the conveyor 2, sends a detection signal to the cut control means 31, and
1, a control signal is issued to lower the feed speeds of the feed roll 7 and the conveyor 2 and the separation roll 8
, The belt-like elastic sheet 1 is sandwiched between the conveyor belt 2 and the idle roll 6 is raised to release the belt-like elastic sheet 1. Thereby, the belt-shaped elastic sheet 1
It is conveyed by the rotational force of the conveyor 2. The first
The sensor has a position (Y = Z−X, a first point) having a distance (Y) obtained by subtracting a predetermined length (X) from the design length (Z) of the strip-shaped elastic sheet from the position of the cutting blade 5. ). The predetermined length (X) and the degree of the low speed vary depending on the mass of the conveyor 2, the feed roll 7, etc., the degree of the high speed, the speed of lifting and lowering of the idle roll 6 and the separation roll 8, and the like. The purpose of the low speed is to improve the accuracy of the stop position by the stop signal by reducing the traveling speed immediately before the stop.

The second sensor 9 detects the leading end of the belt-like elastic sheet 1 and sends a detection signal to the cut control means 31 to stop the conveyor 2 and the feed roll 7 according to the control signal of the cut control means, and to control the idle roll. 6, the belt-shaped elastic sheet 1 is also held by the take-up means 16 and the cutting means 15 is operated. Second sensor 9
Is a position (second point) having an interval corresponding to the design length (Z) of the strip-shaped elastic sheet 1 from the position of the cutting blade 5.

In the above description of the apparatus, the cutting method is individually referred to. The cutting method using this apparatus is shown in FIG.
(A) to (e) will be described in order.

First, as shown in FIG. 1A, a long strip-shaped elastic sheet 1 is sandwiched between a feed roll 7 and an idle roll 6, and the feed roll 7 and the conveyor 2 are simultaneously started, and the strip-shaped elastic sheet 1 is started. The sheet 1 is guided to the conveyor 2 below the raised cutting blade 5 and is placed on the conveyor 2 at a high speed until the leading end reaches a position (first point) where the first sensor 10 detects the leading edge. Send out. When the leading end of the belt-shaped elastic sheet 1 reaches the first point, the first sensor 10 sends a detection signal to the cut control means 31 (see FIG. 1), and the cut control means 31 transmits a control signal, and
As shown in (b), the feed speed of the feed roll 7 and the conveyor 2 is reduced, the separating roll 8 is lowered, the belt-like elastic sheet 1 is sandwiched between the feed conveyor 7 and the idle roll. Then, the belt-like elastic sheet 1 is released by the take-up means 16 by raising the sheet 6.

The accuracy of the stop position of the belt-like elastic sheet 1 is improved by lowering the feed speed from the position of the first sensor 10. In addition, while the front end of the belt-shaped elastic sheet 1 reaches the position of the first sensor 10 from the cut position, the belt-shaped elastic sheet 1 is moved at a high speed in order to improve work efficiency. Conveying means 18 (FIG. 1)
(See FIG. 2), the belt-like elastic sheet 1 is held by the holding means 16, and the belt-like elastic sheet 1 is released by the take-up means 16, so that the power source for conveying the belt-like elastic sheet 1 is transferred from the feed roll 7 to the conveyor 2. By using only one power source for conveyance, the belt-shaped elastic sheet 1 is not stretched or compressed even when an error occurs in the feed speed between the feed roll 7 and the conveyor 2.

As shown in FIG. 2C, the leading end of the strip-shaped elastic sheet 1 traveling at a reduced speed reaches a position (second point) detected by the second sensor 9, and the second sensor 9 cuts the detection signal. When sent to the means 31, the cut control means 31
Issues a control signal to feed the roll 7 and the conveyor 2
Is stopped, the idle roll 6 is lowered, and the belt-shaped elastic sheet 1 is
Then, the band-shaped elastic sheet 1 is cut by operating the cutting blade 5. After the conveyance is stopped in a state where the belt-shaped elastic sheet 1 is pinched at one point, the band-shaped elastic sheet 1 is pinched at two points without compression and expansion, so that the band-shaped elastic sheet 1 is cut without distortion. Therefore, the length of the cut strip-shaped elastic sheet 1 "is stabilized.

After the completion of the cutting, as shown in FIG.
The conveyor belt 2 is rotated to convey the strip-shaped elastic sheet 1 ″ to the next step (not shown). Subsequently, as shown in FIG. 2E, the strip-shaped elastic sheet 1 to be cut next is rotated by rotating the feed roll 7. By repeating this operation, the long strip-shaped elastic sheet 1 is fed and cut.

FIG. 3 and FIG. 4 summarize the feed cutting method in a flowchart. FIG. 3 shows the operation of each part of the feed cutting device by an arrow, and FIG. 4 shows each operation by a flow chart. First, the belt-shaped elastic sheet 1 (see FIG. 1) is sandwiched between the feed roll 7 and the idle roll 6, and in step a, the feed speed between the feed roll 7 and the conveyor 2 is increased. Next, in step b, the feed speed of the feed roll 7 and the conveyor 2 is changed from a high speed to a low speed, and further stopped.
This step b is carried out in step b ′
And the conveyor 2 at a low speed, the separating roll 8 is lowered, the idle roll 6 is raised in step b ", and finally the feed roll 7 and the conveyor 2 are stopped. The idle roll 6 is lowered to support the belt-shaped elastic sheet 1 at two places,
In step d, the cutting blade 5 is lowered to cut the belt-shaped elastic sheet 1. After raising the cutting blade 5 in step e, the separating roll 8 is raised in step f,
The strip-shaped elastic sheet 1 ″ (see FIG. 2D) cut by running the conveyor 2 is sent to the next step.

[0027]

As is apparent from the above description,
The feed cutting method and the feed cutting device of the present invention have the following effects.

In the feed cutting device according to the first aspect, the feed cutting method according to the second aspect can be effectively performed, and the cut control unit detects the sheet fed from a sensor that detects the leading edge of the sheet. The signal is processed, and a control signal is sent to a pickup means, a cutting means, a transport means and the like to operate each. By controlling the belt-shaped elastic sheet to be pinched and conveyed at one place, stopped, and controlled to be clamped at two places only when cutting, the band-shaped elastic sheet can be cut without distortion due to compression and expansion. it can.

According to the feed cutting method of the present invention, the leading end of the belt-shaped elastic sheet to be conveyed is detected at a predetermined position,
By controlling the conveyance speed in the take-up means and the conveyance means based on the detection signal, and by setting the power source for conveying the band-shaped elastic sheet to any one of the pickup means and the conveyance means, compression and expansion into the band-shaped elastic sheet are performed. It is transported so that no distortion such as remains. Further, at the time of cutting, the conveyance is stopped, and the sheet is stably cut by sandwiching the front and rear of the cutting means. Since the strip-like elastic sheet cut in this way does not leave any distortion, there is no problem that the dimensions change after cutting.

Further, by lowering the conveying speed before the stop, the stop position becomes accurate, and the variation in the length of the cut strip-shaped elastic sheet is further reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing an outline of a feed cutting device of the present invention.

2A and 2B are conceptual diagrams illustrating a feed cutting method of the present invention. FIG. 2A shows a state in which the leading end of a belt-shaped elastic sheet 1 fed by a feed roll 7 reaches a position of a first sensor 10. 2B shows a state in which the tip of the belt-shaped elastic sheet 1 has reached the position of the second sensor 9 and has separated the idle roll 6, and FIG. Roll 6 is lowered to make belt-like elastic sheet 1
In a state where the cutting blade 5 is actuated while fixing at two places. FIG. 2D shows a state in which the cut strip-shaped elastic sheet 1 ″ is pulled apart, and FIG. 2E shows a state in which the strip-shaped elastic sheet 1 to be cut next is fed to the transport conveyor 2.

FIG. 3 shows the operation order of the feed cutting method according to the present invention, wherein the movement of each part of the feed cutting device is indicated by an arrow, and the operation order is indicated by a to f.

FIG. 4 is a flow chart showing the feed cutting method shown in FIG. 3; The symbols correspond to FIG.

FIG. 5 is a side view showing an outline of a conventional feed cutting device.

6A and 6B show a cleaning blade for an electrophotographic copying machine as an example of a strip-shaped elastic sheet cut by the feed cutting method of the present invention. FIG. 6A is a front view, and FIG.
(B) shows a side view.

[Explanation of symbols]

 1: Belt elastic sheet 2: Conveyor 4: Blade holder 5: Cutter blade 6: Idle roll 7: Feed roll 8: Separation roll 9: Second sensor 10: First sensor 15: Cutting means 16: Pulling means 17: Sensor 18: Conveying means 31: Cut control means

Claims (2)

[Claims] 1. A belt-like elastic sheet take-off means comprising a feed roll and an idle roll which come and go, a cutting means comprising a cutting blade and a pedestal which come and go, a conveyor,
A stripping device for cutting a strip-shaped elastic sheet in which a separation roll which comes in contact with the transfer conveyor and two transporting means provided with two sensors for detecting the leading end of the strip-shaped elastic sheet are arranged in this order; The take-off means and the transfer means are set to a low speed, the separation roll is brought into contact with the transfer conveyor and the idle roll is separated, and the second
Cutting the strip-shaped elastic sheet, wherein cut-off control means for stopping the take-up means and the transport means in response to a detection signal of a sensor and contacting the idle roll with the feed roll to operate the cut means is provided. apparatus. 2. A method for cutting and feeding a belt-shaped elastic sheet to a design length by passing a take-up means, a cutting means, and a conveying means in this order, wherein the take-up means holds the band-shaped elastic sheet. The belt-like elastic sheet is conveyed at high speed until the leading end of the band-like elastic sheet reaches the position of the first sensor, and the leading end of the band-like elastic sheet reaches the position of the first sensor. Then, the feed speed of the take-up means and the transport means is reduced, and the belt-like elastic sheet is sandwiched by the transport means, and the belt-like elastic sheet is released by the take-up means. When the leading end of the elastic sheet reaches the position of the second sensor, after stopping the conveyance by the collection means and the conveyance means, Feeding and cutting the belt-like elastic sheet, wherein the cutting means is actuated by sandwiching the belt-like elastic sheet.