JP4811907B2 - Tatami sewing device - Google Patents

Description

  The present invention provides a sew stitch that covers a tatami mat on the tatami floor and sews it to the end surface of the tatami floor. A tatami stitching device capable of performing any sewing process of reverse stitching sewn on the floor side, particularly suitable for sewing a thin tatami mat having a thickness of about 20 mm or less. The present invention relates to a tatami-stitching device that can change patterns easily and easily, can efficiently perform sew stitching and reverse stitching on thin tatami mats, and can achieve a high product value finish.

  Tatami mats are indispensable in Japanese houses and have been used for a long time. Even today, when the architectural style of residential houses has diversified, they are used in Japanese-style rooms and Western-style rooms, so-called tatami mats. Has come to be used as often.

  Among them, the tatami mats used between Japanese styles usually have a tatami mat thickness of about 50 to 60 mm. The tatami mat is put on the tatami floor and sewn on the end surface of the tatami floor. A machine that performs a series of sewing processes, such as overlaying a hem cloth on the side edge of the tatami floor from above (sewing with flat stitches), folding the tatami edge and sewing to the side of the tatami floor (backward stitching). It is done by sewing.

  On the other hand, the tatami mat with a tatami mat used in Western style is a thick tatami mat with a tatami thickness of about 50 to 60 mm, whereas a tatami mat has a tatami thickness of about 10 to 20 mm. (Or ultra-thin tatami mats), if so thin, it is difficult to machine sew with a traditional tatami sewing machine designed for thick tatami mats. It was not a normal and elegant tatami mat, but the product value was extremely low.

  In addition, as a sewing machine for mechanically sewing thin tatami mats, a sewing machine with a main sewing method for saddle stitching and a sewing machine with a main sewing method for reverse stitching have been developed. The sew sewing machine performs a sewing operation in a so-called ladder stitch sewing pattern as shown in FIG. 6 and is mainly used for sewing a sew sewing. The sewing operation is performed in a so-called staggered stitch pattern as shown in FIG. 7, and is mainly used for reverse stitching.

  The sewing machine used for sewing these thin tatami mats uses an arc-shaped sewing needle, and the arc-shaped sewing needle passing through the upper thread (U) advances along the arc. The tatami mat (H) or the edge cloth (N) is inserted from one point a (hereinafter referred to as a point) of the end surface or side surface of the tatami floor (T) shown in FIG. 6 and FIG. The needle tip comes out from one point b (hereinafter referred to as b point) on the back of the tatami floor (T) through the needle, and the needle tip enters the hook in which the lower thread (L) is wound, and then the sewing needle retracts. By doing so, the sewing operation of the main sewing is performed. As a result, the upper thread (U) and the lower thread (L) intersect at one point c (hereinafter referred to as point c) in the tatami floor (T) to form a knot, and so-called "actual sewing" is performed. . The main sewing machine has a point d (hereinafter referred to as point d) where the sewing machine head is lowered below the back surface of the tatami floor (T) by lowering the sewing head after the needle has been removed from the end face or side surface of the tatami floor (T). The needle tip enters the hook that has the lower thread (L) wound in, and then the sewing needle moves backward to perform the sewing operation of the main stitch. As a result, the upper thread (U) and the lower thread (L) intersect at one point e (hereinafter referred to as e point) outside the back surface of the tatami floor (T) to form a knot, and so-called “empty stitching” is performed. Is called. By the combination of “actual sewing” and “blank stitching” depending on the position of the sewing head and the sewing machine feed operation, the sewing of the ladder sewing shown in FIG. 6 or the staggered sewing pattern shown in FIG. 7 is performed.

  In this case, the upper thread (U) entered from one point (a) on the end face or side of the tatami floor (T) and the lower thread (L) entered from the point b on the back surface of the tatami floor (T) are tatami floors. The tatami floor (T) is tightened at the point c in (T) and the e point outside the back surface of the tatami floor (T), so that the end surface or side surface of the tatami floor (T) is the upper thread ( U), and in particular in the case of thin tatami mats, the deformation is large and the distance to the tatami surface is short, so that the dent deformation extends to the tatami surface. There is a risk that the product value will be lost due to the tatami mat fabric being pulled too far. Further, in this case, as shown in FIGS. 8A and 8B, holes on the end face or side surface of the tatami floor (T) (hereinafter referred to as “a hole”) generated when the upper thread (U) passes. On the other hand, the force v3 (the resultant force of the vector v1 and the vector v2) that lowers the tatami mat (H) and the edge cloth (N) works, and in the case of a thin tatami mat, the influence of the wedge effect due to the penetration of the sewing needle is also added. If the hole a spreads downward, or the tatami floor (T) cracks at the line connecting the points a, c, and e, the quality of the tatami that has been sewn is not broken. There is a risk of damage.

Separately, the sewing pattern can be changed by raising / lowering control of the sewing operation mechanism and feed control of the sewing machine main body so that it is possible to efficiently perform sew and reverse stitches on thin tatami mats. There has also been proposed a tatami-stitching device that can be used (for example, see Patent Document 1).
JP 2002-292170 A

  As described above, in a conventional sewing machine, especially when a thin tatami mat having a tatami mat thickness of, for example, about 10 to 20 mm is sewed, a so-called tatami mat or a tatami edge cloth is excessively pulled, or a tatami floor is cracked. The product value may be impaired.

  Further, the above conventional tatami stitching device that changes the sewing pattern by the raising / lowering control of the sewing needle operating mechanism and the feed control of the sewing machine body requires a dedicated power source for the raising / lowering mechanism, and the raising / lowering control and feed control. Must be controlled in accordance with each pattern, and the apparatus and the control system become complicated.

  The present invention solves these problems, and covers the tatami mat on the tatami floor and sews it to the end surface of the tatami floor, and also overlays the tatami mat on the side edge of the tatami floor. It can be used for any of the reverse stitches that fold back the flat sewed edge fabric and sew it on the side of the tatami floor, and is suitable for sewing thin tatami mats with a thickness of about 20 mm or less. Therefore, it is possible to provide a tatami stitching device that can easily and variously change the seam pattern, can efficiently perform sew stitching and reverse stitching on thin tatami mats, and can achieve a high product value finish. It is aimed.

  The tatami stitching device of the present invention is equipped with a sewing machine driving shaft that rotates using a sewing machine driving motor as a driving source, and a sewing needle that has a hole through which an upper thread for sewing is inserted, and interlocks with the rotation of the sewing machine driving shaft. These are equipped with a needle actuation mechanism that reciprocates the sewing needle once every time the sewing machine drive shaft makes one revolution, and also includes a bobbin that accommodates a bobbin in which a lower thread for sewing is accommodated and that rotates in conjunction with the reciprocating operation of the sewing needle. The sewing machine needle and the hook operate synchronously to perform the sewing operation, and the sewing head is configured to be able to swing up and down so that the sewing position changes up and down, and the sewing machine drive shaft has 3 as a drive source. It consists of a camshaft that rotates once every rotation, a cam on the camshaft, and a transmission mechanism that is linked to the cam, and the sewing drive shaft performs three sewing operations in three rotations at the raised sewing position. , The sewing machine drive shaft is 3 The head lifting mechanism that swings the sewing machine head up and down so that one sewing operation during rolling is performed at the lowered sewing position, and the sewing machine drive shaft, the sewing machine head, and the sewing machine body on which the head lifting mechanism is mounted can be moved. A tatami stitching apparatus comprising: a sewing machine feed mechanism; a sensor that detects a rotational position of the camshaft; and a control device that operates the sewing machine feed mechanism based on a detection signal of the sensor and moves the sewing machine body at a predetermined timing. The plurality of sensors are installed corresponding to the plurality of rotational positions of the camshaft, the detection signals of the plurality of sensors can be selected, and the sewing pattern can be changed depending on which sensor detection signal is selected. It is characterized by comprising.

  The sewing needle may be an arc needle or a straight needle. The reciprocating motion in the case of an arc needle is a swinging revolving motion, and the reciprocating motion in the case of a straight needle is a linear reciprocating motion.

  In this tatami stitching device, the sewing machine driving shaft rotates with the sewing machine driving motor as the driving source, and every time the sewing machine driving shaft makes one rotation, the sewing needle that passes the upper thread makes one reciprocation, and the lower thread is wound to synchronize and rotate. Sewing operation is performed in synchronization with the kama. Further, every time the sewing machine driving shaft makes three revolutions, the cam shaft makes one revolution, the head lifting mechanism operates, the sewing head moves up and down, and the sewing operation of the sewing machine shaft that has made three revolutions increases. The sewing position is switched so that it is performed at the sewing position, and one sewing operation of the sewing machine drive shaft rotating three times is performed at the lowered sewing position. Further, the control means operates the sewing machine feed mechanism based on the detection signal of the sensor that detects the rotational position of the camshaft, and moves the sewing machine main body at a predetermined timing. Thereby, sewing with a predetermined sewing pattern is performed. A plurality of sensors are installed corresponding to a plurality of rotational positions of the camshaft, detection signals of the plurality of sensors can be selected, and the sewing pattern can be changed depending on which sensor detection signal is selected.

  In this tatami stitching device, the sewing pattern can be changed depending on which one of the detection signals of the plurality of sensors is selected as described above, and the selection is made by switching a circuit for inputting the detection signal of the sensor to the control device with a switch. Alternatively, the control can be performed by switching the control circuit of the control device, and there is no need for complicated control for controlling the elevation control and the feed control in accordance with the patterns as in the prior art. The head lifting mechanism is driven by a cam shaft that uses a sewing machine driving motor as a driving source, and does not require a dedicated power source. Therefore, the apparatus and the control system can be simplified.

  And, by changing the sewing pattern, the sew stitch that covers the tatami floor on the tatami floor and sews it to the end surface of the tatami floor, and the sewed woven cloth that overlaps the side edge of the tatami floor from the top of the tatami floor It is possible to perform any sewing process of reverse stitching that folds back and sews to the side of the tatami floor, especially for thin tatami mats with a thickness dimension of about 20 mm or less. It is possible to select a sewing pattern that is less likely to be too much or cause cracks in the tatami floor, so that the sew and reverse stitches can be efficiently performed on a thin tatami mat, and the finished product has a high product value.

  In particular, three sensors for detecting the rotational position of the camshaft are preferably installed at intervals of about 120 ° along the circumference centered on the axis of the camshaft. In addition to so-called ladder stitching and zigzag stitching, the tightening force is dispersed, and the force to pull down the tatami mat and the edge cloth to the hole on the tatami floor end face or side face through which the thread is passed is dispersed. Sewing patterns that can be made to be selectable, so that in the sewing of thin tatami mats, the tatami mat or the tatami edge fabric becomes excessively shaped, or the tatami floor is cracked and the product value is lost. Can be prevented.

  As is clear from the above description, according to the tatami stitching device of the present invention, the sewing pattern can be changed depending on which of the detection signals of the plurality of sensors is selected, and the selection does not require complicated control, Since the head lifting mechanism does not require a dedicated power source, the apparatus and the control system can be simplified.

  And, by changing the sewing pattern, the sew stitch that covers the tatami floor on the tatami floor and sews it to the end surface of the tatami floor, and the sewed woven cloth that overlaps the side edge of the tatami floor from the top of the tatami floor It is possible to perform any sewing process of reverse stitching that folds back and sews to the side of the tatami floor, especially for thin tatami mats with a thickness dimension of about 20 mm or less. It is possible to select a sewing pattern that is less likely to pass or cause cracks in the tatami floor, so that it is possible to efficiently perform sew and reverse stitching on a thin tatami mat and achieve a high product value finish.

  In particular, by installing three sensors for detecting the rotational position of the cam shaft at intervals of 120 ° along the circumference centered on the axis of the cam shaft, a combination of detection signals of the sensors to be selected is set. It can be changed as appropriate to disperse the tightening force in addition to so-called ladder stitching and zigzag stitching, and to disperse the force to pull down the tatami mat and the edge cloth to the hole on the tatami floor end face or side surface through which the thread passes. Sewing patterns that can be selected can be selected, so that, in thin tatami mat sewing, the product value is prevented from being lost due to the tatami mat or the tatami mat cloth being excessively pulled or cracked on the tatami floor. be able to.

  In other words, the tatami floor is placed on the tatami floor and sewn on the end surface of the tatami floor, and the side cloth on the side surface of the tatami floor is folded over the side edge of the tatami floor and folded on the side edge of the tatami floor. It can be used for both reverse stitching and sewing, and is suitable for thin tatami mats with a thickness of about 20 mm or less. The stitch pattern can be changed in various ways and easily. In addition, it is possible to efficiently perform sew stitching and reverse stitching on thin tatami mats and achieve a high product value finish.

  1 to 5 show an example of an embodiment of the present invention. 1A and 1B show the structure of a tatami stitching apparatus, wherein FIG. 1A is a vertical sectional view with the sewing head raised, FIG. 1B is a vertical sectional view with the sewing head lowered, and FIG. Fig. 3 shows the structure of the apparatus, (A) is a horizontal sectional view, (B) is a front view of a portion where a sensor is arranged, Fig. 3 is an explanatory diagram showing a sewing pattern changing operation in a time chart, and Fig. 4 is selectable. (A) is an explanatory diagram of a first sewing pattern (ladder sewing), (B) is an explanatory diagram of a second sewing pattern (staggered stitching), and (C) is a third sewing pattern. FIG. 5 is an explanatory diagram for explaining the pattern (deformation sewing), and FIG. 5 is an explanatory diagram for explaining the thread force in the case of the third sewing pattern (deformation sewing).

  The structure of the tatami-stitching device of this embodiment is based on the structure of a conventional sewing machine exclusively used for ladder sewing, as shown in FIGS. 1 and 2, and travels along the traveling direction of the sewing machine. A feed pinion 5 is provided at the lower part of the sewing machine body 10 so that the running rails 2 and 3 installed on the base 1 are engaged with a feed rack 4 fixed to the running base 1 to run the sewing machine body 10. ing. The feed pinion 5 causes the sewing machine main body 10 to travel by a feed motor 6 that rotates intermittently in synchronization with the rotation of the sewing machine.

  A sewing machine motor 7 is attached to the sewing machine body 10. The sewing machine motor 7 transmits the rotation to the intermediate shaft 9 via the handle shaft 8. The intermediate shaft 9 rotates the sewing machine drive shaft 11 at a 1: 1 speed ratio, and rotates the cam shaft 14 via the first reduction gear 12 and the second reduction gear 13 meshing therewith. The first reduction gear 12 and the second reduction gear 13 are configured such that the number of teeth is 1: 3. Therefore, when the sewing machine drive shaft 11 rotates three times, the cam shaft 14 rotates once.

  When the sewing machine drive shaft 11 makes one revolution, the needle arm 15 makes one reciprocation. Therefore, the sewing machine needle 16 fixed to the needle arm 15 also makes one reciprocation, and the needle 17 and the kama 17 that rotates at the same time are interlocked. Sewing operation can be performed.

  Since this sewing machine is a lockstitch sewing machine, a sewing thread (U) called an upper thread is inserted into the sewing needle 16 and a sewing thread called a lower thread (L) is wound around the bobbin in the hook 17. Is contained. Further, in this embodiment, the sewing needle 16 is an arc needle, and the needle arm 15 performs a swinging and swiveling motion (a linear reciprocating motion may be performed using the sewing needle as a straight needle).

  An upper and lower cam 18 is attached to the cam shaft 14, and the sewing machine head 20 is moved up and down via a head elevating mechanism including a roller 31 rotating along the outer periphery of the upper and lower cam 18, a swing arm 32, a link 33, and the like. Rock.

  The sewing machine head 20 has a needle arm 15, a hook 17 and the like mounted near the tip. The sewing machine driving shaft 11 causes the needle arm 15 and the hook 17 to rotate synchronously to perform a sewing operation, and the sewing machine driving shaft 11 is a fulcrum. As the needle arm 15 and the hook 17 are moved up and down, the sewing position is changed up and down.

  The rotation ratio between the sewing machine drive shaft 11 and the cam shaft 14 is 3: 1, and about 2/3 of the outer circumference of the upper and lower cams 18 is made large in diameter so as to raise the sewing machine head 20. Therefore, the sewing head 20 performs sewing at the sewing machine raised position twice for three rotations and sewing at the sewing machine lowering position once every three rotations.

  In order to detect the feed timing, a striker 22 is attached to the timing setting plate 21 attached to the shaft end of the cam shaft 14, and the main body frame 19 is provided along a circumference centered on the axis of the cam shaft 14. First, second, and third three sensors 23a, 23b, and 23c are attached to each other at 120 ° intervals.

The TatamiNui desorption device, when causing the sewing machine feed timing of the sewing machine feed A shown in FIG. 3, as shown in FIG. 4 (A), sewing patterns of the same ladder stitch as FIG 6 (first stitch pattern ) Perform sewing operation. The feed timing in this case is detected by the first sensor 23a shown in FIG. The sewing machine feed amount is determined by sending a signal detected by the first sensor 23a to a control device (not shown) and controlling the rotation amount or rotation time to rotate the feed motor 6.

  This ladder sewing pattern (first sewing pattern) is particularly suitable for the saddle stitching. The sewing operation itself is the same as the conventional sewing operation described with reference to FIGS.

  When the sewing machine feed is performed at the timing of the sewing machine feed B in FIG. 3, a staggered stitch pattern (second sewing pattern) shown in FIG. 4B is obtained. The feed timing in this case is detected by the second and third sensors 23b and 23c shown in FIG. Then, the signals detected by the sensors 23b and 23c are sent to the control device, and the feed motor 6 is rotated by a certain amount.

  The zigzag stitching pattern in this case is the same as the conventional zigzag stitch shown in FIG. However, the zigzag stitching in this case is the point where the one stitch stop sewing is performed at the position of the hole indicated by a in FIG. 4B (sewing twice at the position a) and the conventional general zigzag stitching shown in FIG. And different. In the case of a conventional general staggered sewing machine, the rotation ratio between the sewing machine drive shaft and the cam shaft is 2: 1 and the sewing head alternately raises and lowers, so there is no stop stitching.

  This staggered stitch pattern (second stitch pattern) is particularly suitable for reverse stitching. The sewing operation itself is the same as the conventional sewing operation described with reference to FIGS.

  Further, when the sewing machine feed is performed at the timing of the sewing machine feed C in FIG. 3, a deformed (trapezoidal) sewing pattern (third sewing pattern) as shown in FIG. In this sewing pattern, as shown in FIG. 5, the force v3 (the resultant force of v1 and v2) that causes the thread to pull down the edge cloth (N) or the tatami mat (H) is dispersed, so that the conventional ladder stitching and staggered stitching are performed. Therefore, even if a thin tatami mat is sewed, it is less likely that a hole in the edge cloth (N) or the tatami mat (H)) will spread or the tatami floor (T) will break. Further, since one feed is made for one rotation of the sewing machine, the sewing speed is also increased.

  The feed timing in this case is detected by the first, second and third three sensors 23a, 23b and 23c shown in FIG. Then, the signals detected by the sensors 23b and 23c are sent to the control device, and the feed motor 6 is rotated by a certain amount.

  This deformation (trapezoidal) sewing pattern (third sewing pattern) is particularly suitable for reverse stitching. The sewing operation itself is the same as the conventional sewing operation described with reference to FIGS.

  Thus, depending on which of the detection signals (including the detection signals of a plurality of sensors) of the first, second, and third sensors 23a, 23b, and 23c that determines the feed timing is selected, (A) in FIG. It is possible to perform sewing with three sewing patterns including a ladder sewing, a staggered sewing, and a deformed (trapezoidal) sewing pattern shown in FIG. The selection can be performed by switching a circuit for inputting the detection signal of the sensor to the control device with a switch, or by switching the control circuit of the control device.

  Further, in the staggered stitch and deformed (trapezoidal) sewing patterns shown in FIGS. 4B and 4C, the sewing head 20 is lowered as shown in FIG. The “blank stitch” in which the sewing needle 16 passes through the point “d” in (C) or FIG. 7 (C) does not necessarily have to be the sewing (stop stitching) in a state where the traveling of the sewing machine body 10 is stopped. Instead, as shown as sewing feed D or sewing feed E in FIG. 3, it is possible to set a feed pattern in which the two feeds before and after “blank stitching” are combined into one feed. At that time, the feed timing is detected by the second sensor 23b shown in FIG. 3 in the case of the sewing feed D, and the first and second sensors 23a shown in FIG. Detect at 23b. Then, the detected signal is sent to the control device. In response to these signals, the control device controls the rotation amount or rotation time of the feed motor 6 to rotate the feed motor 6.

  Although an example of the embodiment has been described above, the present invention is not limited to this, and can of course be implemented in various modes.

BRIEF DESCRIPTION OF THE DRAWINGS The structure of the tatami-stitching apparatus of an example of embodiment of this invention is shown, (A) is a vertical sectional view of the state in which the sewing machine head is raised, (B) is a vertical sectional view of the state in which the sewing machine head is lowered. is there. BRIEF DESCRIPTION OF THE DRAWINGS The structure of the tatami-stitching apparatus of an example of embodiment of this invention is shown, (A) is a horizontal sectional view, (B) is a front view of the part which has arrange | positioned the sensor. It is explanatory drawing which shows the change operation | movement of the sewing pattern in the tatami mat sewing apparatus of an example of embodiment of this invention with a time chart. The sewing pattern which can be selected in the tatami mat sewing apparatus of an example of embodiment of this invention is shown, (A) is explanatory drawing of a 1st sewing pattern (ladder sewing), (B) is the 2nd sewing An explanatory view of a pattern (staggered stitch), (C) is an explanatory view of a third sewing pattern (deformed stitch). It is explanatory drawing explaining the force of the thread | yarn in the 3rd sewing pattern (deformation sewing) which can be selected in the tatami mat sewing apparatus of an example of embodiment of this invention. The conventional ladder sewing (same also in this invention) is shown, (A) The front view of a tatami end, (B) is the bottom view of a tatami end, (C) is sectional drawing of a tatami end. The conventional zigzag stitching is shown, (A) is a side view of the tatami side, (B) is a bottom view of the tatami side, and (C) is a sectional view of the tatami side. The force of the thread | yarn in the conventional sewing pattern is demonstrated, (A) is explanatory drawing in the case of ladder sewing, (B) is explanatory drawing in the case of zigzag stitching.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling base 2, 3 Traveling rail 4 Feeding rack 5 Feeding pinion 6 Feeding motor 7 Sewing machine motor (motor for driving a sewing machine)
8 Handle shaft 9 Intermediate shaft
10 Sewing machine
11 Sewing machine drive shaft
12 First reduction gear
13 Second reduction gear
14 Cam shaft
15 needle arm
16 Sewing needle
17 Cama
18 Vertical cam
20 Sewing head
21 Timing setting board
22 Striker
23a First sensor
23b Second sensor
23c Third sensor
31 Kolo
32 Swing arm
33 Link U Upper thread L Lower thread

Claims (2)

A sewing machine driving shaft that rotates using a sewing machine driving motor as a driving source and a sewing needle having a hole through which an upper thread for sewing is inserted are attached, and the sewing machine driving shaft rotates once in conjunction with the rotation of the sewing machine driving shaft. A needle operating mechanism for reciprocating the sewing needle once for each, a bobbin around which a bobbin thread for sewing is housed, and a kama that rotates in conjunction with the reciprocating movement of the sewing needle. Each time the sewing machine driving shaft is rotated three times with the sewing machine driving motor as a driving source and the sewing head configured to be able to swing up and down so that the sewing position changes vertically. The sewing shaft is rotated once and the sewing shaft is driven at the raised sewing position when the sewing machine driving shaft is rotated three times. Axle 3 times The head lifting mechanism that swings the sewing head up and down so that one sewing operation can be performed at the lowered sewing position, and the sewing machine main body on which the sewing machine drive shaft, the sewing head, and the head lifting mechanism are mounted can be moved. Tatami sewing machine comprising a sewing machine feed mechanism, a sensor for detecting the rotational position of the camshaft, and a control device for operating the sewing machine feed mechanism and moving the machine body at a predetermined timing based on a detection signal of the sensor In the landing gear,
A plurality of sensors are installed corresponding to a plurality of rotational positions of the camshaft, detection signals of the plurality of sensors can be selected, and a sewing pattern can be changed depending on which sensor detection signal is selected. A tatami stitching device characterized by that. The tatami stitching device according to claim 1, wherein three sensors are installed at intervals of about 120 ° along a circumference centered on an axis of the cam shaft.

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