JP2016209966A - Tatami facing cutting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfy the desire that the valley of a tatami facing should be cut with the valley of a tatami facing mesh in a straight line form, or that the same should be cut to be a straight line parallel with a straight line of the valley of a tatami facing mesh when the tatami facing is to be cut with a tatami facing cutting machine.SOLUTION: A tatami facing cutting machine for cutting a tatami facing in the width direction by transporting the tatami facing is provided which comprises a sensor for detecting the height or depth of a tatami facing mesh and a sensor for detecting the height or depth of the slope of a rush at a position equidistant or nearly equidistant from the valley of a tatami facing mesh on right and left in the width direction from the valley of a tatami facing mesh to detect whether the tatami facing is transported along the valley of a tatami facing mesh from height or depth data of the tatami facing mesh, height or depth data of the slope of a rush at a position on right in the width direction of a tatami facing mesh, and height or depth data of the slope of a rush at a position on left in the width direction of a tatami facing mesh.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a tatami mat cutting machine. More specifically, the present invention relates to a tatami mat table cutting machine that conveys a tatami mat table while detecting a valley of an eye of a tatami mat table and cuts along or in parallel with a valley of an eye of a tatami mat table.

  In tatami mats woven with weeds and warps as wefts, ears called whiskers formed by weaving parts woven through warp and end of weeds protruding from both sides of this weaving part It is well known that the part exists. (For example, FIG. 7 of Patent Document 1)

  Then, as shown in FIG. 4 of Patent Document 1, a guidance device that guides the tatami mat placed in the receiving basket while centering the left and right (width direction) positions, and up and down to sandwich the tatami mat. A tatami mat feeding device composed of a feeding roller and a pressing roller, a cutting device provided on the exit side of the tatami mat feeding device, and a guide device and a tatami mat feeding device, which cuts the beard portion of the tatami mat table. 2. Description of the Related Art Conventional tatami mat cutting devices are known which are configured by a beard cutting device composed of a rotating blade.

  The feed roller and the rotary blade of the beard cutting device are driven by the main motor, and an encoder for measuring the length of the tatami mat to be fed is coupled to the shaft end on one side of the pressing roller. The measurement signal is sent to a control device (not shown), and a cutting blade for cutting the tatami mat in the width direction is provided on the exit side of the feed roller. It can reciprocate in the width direction) and is driven by a cutting motor. The measurement signal from the encoder is counted, and when the set length is reached, the main motor is stopped and the cutting motor is started by the control device.

  In order to solve the problems of the conventional tatami mat cutting machine, a horizontal frame arranged in the cutting direction in the tatami mat cutting apparatus having a cutting blade attached to a slider and a blade guide rail for moving the slider in the cutting direction. The present applicant has also proposed a tatami mat cutting apparatus (Patent Document 1) comprising a pressing link mechanism including a pressing lever provided in the horizontal frame.

  Furthermore, a tatami table consisting of weaves that are wefts and woven parts woven with warps and beard parts formed from the ends of the weeds protruding from both sides of the weaving part is sent in the longitudinal direction and cut into fixed lengths. The tatami mat cutting machine comprises a core bar, a rotating body fitted into the core bar with a space therebetween, a guide section projecting radially from the rotating body, and an introduction section inclined with respect to the shaft center. There has also been proposed a tatami mat table cutting machine (Patent Document 2) including a tatami mat table guide device for centering a tatami mat table composed of a plurality of guide bars.

JP 09-109088 A JP 09-109093 A

  In the tatami mat cutting machine disclosed in Patent Literature 1 and Patent Literature 2 disclosed above, a guide device (described in FIG. 4 of Patent Literature 1) for centering the tatami mat or a guide rod attached to a rotating body in the guide device is inclined. Both sides of the weaving part of the tatami table slide along the introduction part and abut the inside of the guide part to center the tatami table, but the structure of guiding the end of the woven table regardless of the eyes of the tatami table Therefore, there is a problem that it cannot be cut along or parallel to the valleys of the weave of the tatami surface due to variations in the degree of weaving of the end portions and the contact of the guide device. When cutting a tatami table, the warp of the tatami table is not tensioned, and the troughs of the tatami table may meander without being conveyed in a straight line. However, it also had a problem that it could not be cut in parallel along the valley of the tatami mat.

  When manufacturing a tatami mat, the end of the tatami rim is sewn on the tatami rim so that the valley of the eyes on the tatami surface is hidden. It is a tatami mat with a good finish.

Therefore, when cutting a tatami table with a tatami table cutting machine, there has been a desire to cut along the valleys of the eyes of the tatami table or to cut in parallel along the valleys of the eyes of the tatami table.

In order to solve the above problems, the present invention provides a sensor for detecting the height or depth of the valleys of the tatami mats in the tatami mat table cutting machine that transports the tatami mats and cuts the tatami mats in the width direction. A sensor for detecting the height or depth of the inclined portion of the grass at a position equidistant or substantially equidistant from the valley of the eye in the width direction from the valley of the eye, Depth data, height or depth data of the grass slope at the right of the tatami table eye valley width direction, and height of the grass slope at the left of the tatami table eye valley width direction It is characterized in that it is detected from the depth or depth data whether or not the state along the valley of the eyes of the tatami mat is conveyed in parallel with the valley of the eyes of the tatami mat.

  In addition, each of the sensors described above is characterized by being arranged so as to be shifted in the transport direction of the tatami mat so that the measurement spots do not interfere with each other.

  In each of the above sensors, the measurement data is acquired a predetermined number of times during a predetermined time during the transport of the tatami mat, and the average value of the measurement data acquired by each sensor is calculated, along the valley of the tatami mat table. Is detected.

Furthermore, when it is determined that the tatami mat is meandering to the right or left side by detecting the valley of the eyes of the tatami mat, it has a tatami mat transport correction mechanism for shifting the tatami mat to the side opposite to the meandering direction. .

  According to the present invention, a sensor for detecting the height or depth of the valley of the eye of the tatami table, and the slope of the grass at a position equidistant or substantially equidistant from the valley of the eye in the width direction from the valley of the eye of the tatami A sensor for detecting the height or depth, and the height or depth data of the valley of the eye of the tatami table and the height or depth of the inclined portion of the grass at the right in the width direction of the valley of the eye of the tatami table. By detecting whether the tatami mat is being conveyed along the valley of the eye of the tatami table from the height data and the height or depth data of the slope portion of the grass at the left in the width direction of the trough of the tatami mat It is possible to cut along or parallel to the valleys of the tatami mats.

  When the spot of each sensor is shifted in the transport direction, it is possible to detect the trough of the tatami mat with high accuracy by detecting the transport distance and detecting the trough of the tatami mat in the same grass portion. In addition, it may be performed with measurement data with the spot shifted, and a predetermined number of measurement data is acquired during a predetermined time during tatami mat transport, and the average value of the measurement data acquired by each sensor is calculated. Then, it is possible to cut the tatami table by detecting whether or not the tatami table is being conveyed along the valleys of the eyes of the tatami table.

Furthermore, when it is determined that the tatami mat is meandering to the right or left side by detecting the trough of the tatami mat, the tatami mat transport correction mechanism that shifts the tatami mat to the side opposite to the meandering direction detects the trough of the tatami mat. Therefore, it is possible to cut the tatami mat along the valley of the eyes of the tatami mat or in parallel.

It is a front view of the tatami mat cutting machine of the present invention. It is a side view of the tatami mat cutting machine of the present invention. In FIG. 2, the first sensor, the second sensor, and the third sensor are cut out so as to be visible. It is a top view of the tatami mat cutting machine of the present invention. It is a figure explaining the detection means of the trough of the tatami mat. (A) It is a figure explaining the state which irradiated the spot from the detection means of the valley of the eye of a tatami mat on a tatami mat, (b) is a figure explaining the texture of the grass of the tatami mat surface. It is a figure explaining detection of the valley of the eye of a tatami surface by the 1st sensor, the 2nd sensor, and the 3rd sensor. (A) is a figure explaining the state where the spot of the second sensor matches the valley of the eyes of the tatami table, (b) is a diagram explaining the state where the tatami table starts to shift to the right, and (c) is ( The figure explaining the state which the tatami table further shifted to the right from the state of b) and the valley of the eyes of the tatami table reached the spot of the first sensor, and (d) the state where the tatami table T started to shift to the left. (E) is a diagram for explaining a state in which the tatami table is further shifted to the left from the state of (d) and the valley of the eyes of the tatami table has reached the spot 13 of the third sensor.

  An embodiment of a tatami mat cutting machine 1 according to the present invention will be described with reference to the drawings. FIG. 1 is a front view of a tatami mat cutting machine 1 of the present invention, FIG. 2 is a side view of the tatami mat cutting machine 1 of the present invention, and FIG. 3 is a plan view of the tatami mat cutting machine 1 of the present invention.

  A two-dot chain line shown in FIG. The tatami mat T is roll-shaped and set on the tatami mat holding means 3 provided on the frame 2 by the core rod 4, and the tatami mat T is transported along the transport path indicated by the two-dot chain line in FIG. 2.

  5 is an upper front cutting blade for cutting the upper front side of the tatami surface T, and 6 is a lower front cutting blade. The upper front cutting blade 5 is driven to rotate by a motor 5a, and the lower front cutting blade 6 is driven to rotate by a motor 6a. Further, the lower front cutting blade 6 is configured such that the fixed position can be adjusted to the left and right, and the width dimension of the tatami mat T to be cut can be adjusted. The fixing position is adjusted by fastening means that can be operated by hand such as a knob bolt.

  7 is a tatami surface feed roller, and 8 is a tatami surface measuring roller. The tatami table measuring roller 8 is moved up and down by the cylinder 8 a, and is raised when setting the tatami table T, and when cutting the tatami table T, it is lowered by the cylinder 8 a, and between the tatami table measuring roller 8 and the tatami table feeding roller by its own weight. Hold the tatami mat T. Although not shown in the tatami surface measuring roller 8, the encoder or slit disk is detected by a sensor, and the transport length of the tatami surface T is measured by detecting the number of slits that have passed through the sensor. Reference numeral 20 denotes a table on which the tatami mat T is placed, and reference numeral 21 denotes a cutting device that cuts by moving the tatami mat T in the width direction when the tatami mat T having a set length is conveyed. Reference numeral 22 denotes a tatami surface presser that descends and presses the tatami surface T when the tatami surface T is cut by the 21 cutting device.

  9 is a transport correction mechanism for the tatami mat T. When the tatami mat T is not transported in a straight line with respect to the upper cutting blade 5, the transport of the tatami mat T is corrected in the width direction of the tatami mat T. It is a mechanism to do.

  The conveyance correction mechanism 9 includes a correction roller 9b driven by a rotational drive source 9a (for example, a motor), an elevating pinch roller 9c provided on an upper portion of the correction roller 9b so as to be movable up and down, and a correction roller 9b at a swing fulcrum 9d. The swing actuator 9e is configured to swing. The elevating pinch roller 9c is configured to be moved up and down by elevating cylinders 9f provided at the left and right ends of the tatami mat cutting machine 1.

  Reference numeral 10 denotes a means for detecting the valleys of the eyes of the tatami mat T, and three non-contact type distance sensors are provided for the tatami mat T as shown in FIG. The three sensors are viewed from the side, and the measurement spots are schematically viewed from the plane.

  As shown in FIG. 5A, in order to detect the valley of the eye of the tatami mat T, the spot 11a of the first sensor 11 is a texture of the grass of the tatami mat T just to the right of the valley of the eye of the tatami mat T. Irradiates the part with a steep angle. The spot 12a of the second sensor 12 irradiates the valley of the eye of the tatami mat T. The spot 13a of the third sensor 13 irradiates a portion of the tatami mat T on the left side of the valley of the eye of the tatami mat T having a steep angle (see FIG. 5B). The distance in the width direction of the tatami mat T between the spot 11a and the spot 13a with respect to the spot 12a is 1 mm.

  In order to irradiate the spots 11a, 12a, and 13a in the state of FIG. 5, when the first sensor 11 and the third sensor 13 are installed with an angle θ, they are irradiated vertically like the second sensor 12. Therefore, the heights of the spots 11a and 13a may be calculated by multiplying the distance measured by the first sensor 11 and the third sensor 13 by cos θ. Although the angles of the first sensor 11 and the third sensor 13 may be different from each other, the angles are set to be the same in order to arrange the spots from the valleys of the tatami mat T in the same size. It is desirable. And the height data of the tatami mat T of the position where the said spots 11a, 12a, and 13a were irradiated are acquired.

  The spots 11a, 12a, and 13a are intended to be irradiated side by side in the width direction of the tatami mat T. However, if the spots are close, they interfere with each other, and the height of the irradiation position of the spot on the tatami mat T cannot be detected. Only the distance that is not provided is spaced from the transport direction.

  This distance is set to an interval of about 2 to 4 mm, for example, and the transport distance of the tatami mat T can be measured by the above tatami mat measuring roller 8, so that the grass of the height 11 of the spot 11a detected by the first sensor is measured. However, the height Y2 of the spot 12a is measured when it is conveyed to the position of the second sensor 12, and the height of the spot 13a is measured when the grass of height Y1 is conveyed to the position of the third sensor 13. Y3 is measured as data. By acquiring such data, it is possible to perform detection based on the measurement data of the same grass in the width direction even if the grass of the tatami table T may be folded. .

  Further, since the tatami mat T is woven with natural grass or artificial grass, this weave has some variation. In addition, the diameters of artificial rushes are almost even, but the cross-section of natural rushes is circular or elliptical, resulting in variations.

  For this reason, the eye valley of the tatami mat T is detected from the measurement of the height data Y1, Y2, Y3. However, the variation of the grass itself and the weave variation affect the detection of the eye trough of the tatami mat T. It is necessary not to.

  Therefore, the size of the sensor spot is set to about two grasses (for example, 0.8 to 1.5 mm) in the direction of conveyance of the tatami mat T, and 0 in the width direction of the tatami mat T. .About 3 to 1 mm. If the size of the rush is about 2 with respect to the conveyance direction, the highest position of the tatami mat T is measured at the spot where the spot hits without measuring the circular unevenness of the rush. be able to. Of course, it may be a spot having a length of about 5 mm in the transport direction.

  Next, the acquisition interval X and the acquisition number Z of the data of the height data Y1, Y2, and Y3 are determined, and the average data of the height data Y1, Y2, and Y3 is obtained as YA1, YA2, and YA3. If the transport speed of the tatami mat T is S, the distance that the tatami mat T moves while the number of Z pieces is acquired can be calculated, and the distance is set to 5 to 10 mm. By averaging the height data Y1, Y2, and Y3 acquired between 5 and 10 mm to obtain YA1, YA2, and YA3, so as not to be affected by variation in grass and texture of the tatami mat T is there.

  At this time, due to the variation in the texture of the tatami mat T, there may be a texture in which the grass on the left or right side of the trough protrudes to the valley of the tatami mat T. The data Y1, Y2, and Y3 of the portion where the grass is protruding to the valley of the eye of the tatami table T, the values of Y1 or Y3 and the values of Y2 are clearly the height from the table 20 surface Therefore, when the average data is obtained, the data Y1, Y2, and Y3 are averaged out, and the average data YA1, YA2, and YA3 can be obtained to increase the accuracy.

  The detection of the valley of the eyes of the tatami mat T using the average data YA1, YA2, and YA3 acquired as described above will be described.

  The state shown in FIG. 6A shows a state where the spot 12a matches the valley of the eyes of the tatami mat T. At this time, since the average data YA2 is the minimum value, even if the average data YA1 and the average data YA3 vary, the tatami mat T is transported as if the valleys of the eyes of the tatami mat T are detected.

FIG. 6B is a diagram showing a state in which the tatami mat T starts to shift to the right. Since the valley of the eye of the tatami table T is shifted to the right side of the spot 12a, the average data YA1 at that time becomes smaller than that in FIG. 6A, and YA2 and YA3 become larger. Assuming that the average data is YB1, YB2, and YB3 so that they can be distinguished from the data in FIG.
YB1 <YA1, YB2> YA2, YB3> YA3,
And YB3> YB1
It becomes the relationship. It can be detected from this data that the tatami mat T is shifted to the right.

FIG. 6C is a diagram showing a state in which the tatami table T is further shifted to the right from the state of FIG. 6B, and the valleys of the eyes of the tatami table T have reached the spots 11 a of the first sensor 11. Assuming that the average data is YC1, YC2, and YC3 so that they can be distinguished from the data in FIGS. 6A and 6B, respectively.
YC1 <YA1, YC2> YA2, YC3> YA3
And YC3>YC2> YC1
It becomes the relationship. It can be detected from this data that the tatami mat T is shifted to the right. Actually, the spot 11a becomes lower than the spot 12a before the valley of the eyes of the T table reaches the spot 11a of the first sensor 11, and the average data YC3>YC2> YC1 is satisfied. It can be detected that the position is further shifted to the right from the position of).

FIG. 6D is a diagram showing a state in which the tatami mat T starts to shift to the left. Since the valley of the eyes of the tatami table T is shifted to the left side of the spot 12a, the average data YA3 at that time becomes smaller than that in FIG. 6A, and YA2 and YA1 become larger. If the average data are YD1, YD2, and YD3, respectively, so that they can be distinguished from the data in FIG.
YD1> YA1, YD2> YA2, YD3 <YA1,
And YD3 <YD1
It becomes the relationship. It can be detected from this data that the tatami mat T is shifted to the right.

FIG. 6E is a diagram illustrating a state in which the tatami mat T is further shifted to the left from the state of FIG. 6D, and the valleys of the eyes of the tatami mat T have reached the spots 13 a of the third sensor 13. Assuming that the average data is YE1, YE2, and YE3, respectively, so that they can be distinguished from the data in FIGS. 6 (a) and 6 (d),
YE1> YA1, YE2> YA2, YE3 <YA3
And YE3 <YE2 <YE1
It becomes the relationship. It can be detected from this data that the tatami mat T is shifted to the left. Actually, the spot 13a is lower than the spot 12a before the valley of the eye of the T table reaches the spot 13a of the third sensor 13, and the average data YE3 <YE2 <YE1 is satisfied. It can be detected that the position is further shifted to the left from the position of).

Next, the operation of the tatami mat cutting machine 1 of the present invention will be described.
To set the tatami mat T on the tatami mat cutting machine 1, the roll of the tatami mat T is set on the tatami mat holding means 3 with the core rod 4, the lifting pinch roller 9 c and the tatami mat measuring scale rotor are raised, While rotating the lower front cutting blade 6, the tip of the tatami mat T is fed to a place where it can be pinched by the tatami mat feeding roller 7 and the tatami mat measuring roller 8. At this time, the position of the conveyance correction mechanism 9 is aligned, and the tatami mat T is set so that the spot 12a matches the valley of the eyes of the tatami mat T. It is preferable to perform a length setting for cutting in advance or position adjustment of the lower front cutting blade 6 with respect to the upper front cutting blade 5.

  If the setting of the tatami mat T is completed, the elevating pinch roller 9c and the tatami mat measuring scale rotor are lowered to pinch the tatami mat T respectively.

  The tatami mat cutting machine 1 starts cutting the tatami mat T with the operation switch (shown).

  At this time, until the cutting starts, the operator sets the tatami mat T while checking the spot 11a and the spot 13a while aligning the spot 12a with the valley of the eye of the tatami mat T. It is also possible to use Y1, Y2, and Y3 as reference values for control.

  If the tatami mat T can be transported straight, the tatami mat T is transported and cut in the state of FIG. When the tatami mat T starts to shift to the right as shown in FIG. 6B, the swing actuator 9e is operated. Specifically, the rod of the swinging actuator 9e is extended, and the right end of the correction roller 9b is turned around the swinging fulcrum 9d so as to be away from the table 20, so that the tatami mat T is moved to the left. If it still shifts as shown in FIG. 6C, the rod of the swing actuator 9e is further extended.

  Conversely, when the tatami table T starts to shift to the left as shown in FIG. 6D, the swing fulcrum 9d is moved so that the right end of the correction roller 9b approaches the table 20 by reducing the rod of the swing actuator 9e. Rotate to the center so that the tatami mat T moves to the right. If it still shifts as shown in FIG. 6E, the rod of the swing actuator 9e is further reduced.

  As described above, when the eye valley of the tatami mat T deviates from the spot 12a and starts meandering, the correction roller 9b is turned around the swing fulcrum 9d to prevent meandering, and the eye trough of the tatami mat T is In the detected state, the sheet is conveyed for the set length and cut. When the valley of the eye of the tatami mat T deviates from the spot 12a and starts meandering, the meandering of the tatami mat T is prevented, and the eye valley of the tatami mat T is parallel to the eye trough of the tatami mat T. Cut to. Tension table T is slightly tensioned during transport, but is often transported with the valleys of the eyes of the tatami table T bent without being straight, so the transport of the tatami table T is corrected to match the bend. By carrying out with the conveyance mechanism 9, it becomes possible to cut along the valley of the eyes of the tatami mat T or parallel to the valley of the eyes of the tatami mat T. By cutting the tatami table T while detecting the valleys of the eyes of the tatami table T, if the tatami mat T is applied to the tatami floor more strongly than the tension at the time of cutting, the warp yarn of the tatami table is also tensioned, The valley of the tatami mat T is finished with good linearity, and the linearity of the cut portion of the tatami mat T cut along the trough of the tatami mat T parallel to the trough of the tatami mat T is also good.

  Each time the average data YA1, YA2, and YA3 are calculated, the swing actuator calculates which state shown in FIGS. 6 (a) to 6 (e) is performed by a control device (not shown). The operation of the swing actuator 9e is controlled. Therefore, the swing actuator 9e employs an actuator with good response.

  When the set length conveyance is completed, the conveyance of the tatami mat T is stopped, the tatami mat presser 22 is lowered, and the tatami mat T is cut in the width direction by the cutting device 21.

  In the above description, the detection of the valleys of the eyes of the tatami table T in the comparison of the average data YA1, YA2, and YA3 has been described. However, the calculated values of YA1-YA2 and YA3-YA2, that is, the heights of the spots 11a and 12a. The height difference and the height difference between the spot 13a and the spot 12a are compared, and if there is no difference in height, it is determined that the sheet can be conveyed along the valley of the eyes of the tatami mat T, and “calculated value of YA1−YA2” is determined. If <calculated value of YA3-YA2>, it is determined that the tatami mat is meandering to the right, and if the calculated value is "calculated value of YA1-YA2> YA3-YA2," the tatami mat is meandering to the left The swing of the correction roller 9b may be controlled based on the judgment.

  Furthermore, the elevating pinch roller 9c may also be turned around the swing fulcrum 9d integrally with the correction roller 9b. Since the elevating cylinder 9f is fixed to the frame material side of the portion that supports the correction roller 9b, the elevating roller 9c can be moved up and down and swivels with the correction roller 9b while holding the tatami surface T. is there.

  Furthermore, in order to detect the valley of the eye of the tatami mat T, the embodiment with three sensors has been described, but one sensor spot is provided between each of the three left and right ends and the center sensor spot. It is possible to increase the number of sensors to be detected with high accuracy, or to increase the number of sensor spots on the outer sides of the left and right sensors to form five sensors.

In the above description, the embodiment with three sensors has been described. However, a displacement sensor that detects unevenness in the width direction of the tatami table with one sensor may be used, and unevenness in the width direction of the tatami table T with one sensor. The technology for detecting this is equivalent to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Tatami table cutting machine 2 Frame 3 Tatami table holding means 4 Core bar 5 Upper front cutting blade 6 Lower front cutting blade 7 Tatami table feed roller 8 Tatami table measuring roller 9 Conveyance correction mechanism 9a Rotation drive source 9b Correction roller 9c Lifting pinch roller 9d Oscillation Support point 9e Oscillating actuator 9f Lifting cylinder 10 Detection means 11 First sensor 11a Spot 12 Second sensor 12a Spot 13 Third sensor 13a Spot 20 Table 21 Cutting device 22 Tatami table presser

Claims (4)

In the tatami table cutting machine that transports the tatami table and cuts the tatami table in the width direction,
A sensor that detects the height or depth of the valley of the Tatami mat eye,
A sensor for detecting the height or depth of the inclined portion of the grass at an equidistant or almost equidistant position from the valley of the eye in the width direction from the valley of the eye of the tatami table,
The height or depth data of the valley of the tatami mat table,
The height or depth data of the slope of the grass at the right position in the width direction of the eye valley of the tatami table,
From the height or depth data of the sloped portion of the grass at the left side in the width direction of the eye valley of the tatami table, it is determined whether it is being transported in a state along the eye valley of the tatami table or parallel to the eye valley of the tatami table A tatami mat cutting machine characterized by detecting. 2. The tatami mat cutting machine according to claim 1, wherein the sensors are arranged so as to be shifted in the tatami mat transport direction so that the measurement spots do not interfere with each other. In each of the above sensors, measurement data is acquired a predetermined number of times during a predetermined time during transport of the tatami mat, and the average value of the measurement data acquired by each sensor is calculated and the state along the trough of the tatami mat or the tatami mat The tatami mat cutting machine according to claim 1, wherein it is detected whether or not the tatami mat is being conveyed in parallel with the valley of the eyes. 2. A tatami mat transport correction mechanism for shifting the tatami mat to the side opposite to the meandering direction when it is determined that the tatami mat is meandering to the right or left by detection of the valley of the eye of the tatami mat. The tatami mat cutting machine according to claim 3.