JP2742666B2 - Multi-needle sewing device for tatami floors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-ring sewing type multi-needle sewing apparatus used for manufacturing a tatami floor using an insulation boat or a styrofoam plate. By piercing upward from above, a uniform seam without slack of the thread is formed.

[0002]

2. Description of the Related Art There is known a so-called chemical tatami floor in which an insulation boat or a styrofoam plate is stacked as a tatami floor, and a single-ring sewing type multi-needle sewing apparatus is used for sewing the tatami floor. Is used. This sewing device is provided with a needle table in the width direction movably up and down above a tatami floor which is intermittently advanced, and a number of sewing needles are fixed to the needle table in a downward direction. It is formed by providing a large number of thread hooks corresponding to the sewing needles. In FIG. 9, T
Is a tatami mat floor, Y is a sewing thread, 10 is a support for supporting the tatami mat T from below, 1 is the sewing machine needle, and 2 is a thread hook.

In this apparatus, when the tatami floor T stops when the needle bed descends from the upper end of the elevating stroke, a large number of sewing needles 1 are simultaneously pierced into the tatami floor T from the upper side to the lower side. The sewing thread Y pulled out from the lower thread winding and passed through the thread hook 2 is rotated above the hook 1a of the needle tip by the horizontal rotation of the thread hook 2 around the tip of the sewing needle protruding downward. The sewing machine needle 1 is pulled out above the tatami floor T, and then the sewing thread Y is hooked on the hook 1a and pulled out above the tatami floor T. Then, after the above-mentioned tatami floor T is advanced to the left (in the direction of arrow A) by a predetermined pitch,
When the needle base is lowered again, the sewing needle 1 is pierced into the tatami floor T while leaving the loop Ya of the sewing thread Y hanging on the sewing needle 1 on the tatami floor T. Then, by repeating the turning of the thread hook 2, the raising of the sewing machine needle 1 and the forward feeding of the tatami floor T, a row of loops Ya of the sewing thread Y is formed on the upper surface of the tatami floor T, and the transition of the sewing thread Y on the lower surface. Part Yb
Are formed.

[0004]

However, conventionally, the tatami floor T is supported on a receiving stand 10 having a constant height, and the sewing machine needle 1 is inserted into the tatami floor T from above. When the thickness of the tatami floor T is reduced by the change and the upper surface of the tatami floor T is lowered to the chain line t, the height H of the sewing machine needle 1 at the ascending position with respect to the tatami floor T is equal to the thickness d of the tatami floor T. As a result, the slack of the loop Ya hanging on the hook 1a of the sewing machine needle 1 due to the lowering of the sewing machine needle 1 increases, and the loop Ya becomes the hook 1a of the sewing machine needle 1.
a, it is necessary to change the vertical stroke of the sewing machine needle 1 or the feed length of the tatami floor T every time the thickness of the tatami floor T changes in order to prevent this.

A tatami mat (not shown) is attached to the upper surface of the tatami floor T after the sewing, and a row of a loop Ya of a sewing thread Y exists on the upper surface of the tatami floor T.
a is formed of two parallel sewing threads Y, and since this loop Ya lies on the tatami floor T made of a hard insulation board as compared with rice straw, the feeling of unevenness is increased and the foot feel is not good. . On the other hand, a row of transition portions Yb made of one sewing thread Y is formed on the lower surface of the tatami floor T, but the needle hole on the upper surface of the tatami floor T has one straight line because the sewing needle 1 pierces from above. While the needle holes on the lower surface are shifted to the front, rear, left and right with respect to the needle holes on the upper surface due to the variation in resistance of the tatami floor T when the sewing machine needle 1 descends,
For this reason, the seam line made of the jumping yarn Yb is formed in a zigzag shape and is exposed without being covered with a tatami mat or the like, which deteriorates the appearance when the product tatami is erected.

According to the present invention, the sewing needle is inserted upward from the bottom with respect to the tatami floor, thereby eliminating the need to change the setting stroke of the sewing needle and the feed length of the tatami floor when changing the thickness of the tatami floor, and The feeling of unevenness on the surface side after the tatami mat is attached is reduced, and the positions of the needle holes appearing on the lower surface are aligned on a straight line to improve the appearance of the seam.

[0007]

SUMMARY OF THE INVENTION A multi-needle sewing apparatus for a tatami floor according to the present invention comprises a plurality of tatami floor slabs such as an insulation board and an expanded polystyrene board which are intermittently advanced and forwarded. In a multi-needle sewing apparatus for a tatami floor, in which a large number of sewing needles arranged in a width direction are pierced into the above-mentioned plate material at the time of rest and a large number of rows of single-ring sewing are performed, a support for supporting the tatami floor plate from below. A needle table in which a large number of single-ring stitch sewing needles are implanted upward is provided below the table so as to be able to move up and down, and when the sewing needle penetrates the plate material above the receiving table, the plate is held down. A holding member for preventing escape is provided, and a thread hook for the large number of sewing needles is provided above the holding member.

[0008] The tatami floor T shown in Fig. 1 has a foamed polystyrene plate Tb sandwiched between upper and lower insulation boards Ta in a sandwich shape. It can be changed appropriately according to the purpose. Then, a woven sheet or other lining sheet made of nonwoven fabric, paper, or synthetic resin tape is overlapped on the front and back surfaces, and can be sewn together with the plate members Ta and Tb to be integrated. The cradle 10 is made of the above-mentioned tatami floor plate Ta, T
b is supported from below so that the sewing machine needle 17 can penetrate the plate materials Ta and Tb. For example, the sewing machine needle is formed to be long in the width direction as shown in the drawing, and between left and right side frames (not shown). Fixed to

The needle table 16 located below the receiving table 10
A large number of single-ring stitch sewing needles 17 are fixed upward on the upper surface thereof. The sewing needles 17 may be arranged in a single row, or may be arranged in a staggered manner in two rows as shown in the drawing. / 2 is preferred. And this needle base 16
Is the widthwise main shaft located below (not shown)
Can be moved up and down via a piston / crank mechanism (not shown) or the like. The tatami floor T (plate material Ta, Tb for tatami floor) is provided with a feed roller 1 which rotates when the needle base 16 descends in conjunction with the rotation of the spindle.
2, the feed is intermittently advanced in the direction of arrow A by a predetermined distance (sewing pitch).

A holding member 30 above the receiving table 10
When the sewing machine needle 17 is pierced from below onto the tatami flooring plates Ta and Tb which are stationary on the receiving table 10, the plate Ta,
A plate having holes or openings through which the sewing needles 17 pass one by one or a plurality of them at a time, while preventing the Tb from floating excessively, and the sewing machine For example, two bars or rollers or the like before and after are arranged in parallel with a gap through which the needle 17 can pass. When the sewing machine needle 17 is located below the receiving table 10, the pressing member 30 and the pressing member 3
0, the plate members Ta and Tb can move in the front-rear direction, and the sewing machine needle 17 rises to move the plate members T and Tb.
When a and Tb are pierced, they can be supported at arbitrary heights by the support means 30A at the left and right ends as long as the piercing is possible.

The above-mentioned supporting means 30A includes a holding member 30.
That can adjust the height of the tatami mat according to the thickness of the tatami floor T is preferable. Further, the lower surface of the holding member 30 is made of the plate material Ta, Tb.
The plate Ta, Tb can be automatically raised and lowered so as to float from the surface when the plate materials Ta and Tb are moved forward, and a cam that rotates in conjunction with the rotation of the main shaft and It can be configured using a link mechanism. The pressing member 30 is formed in a plate shape long in the width direction as shown in the figure, and a needle hole 30b through which the sewing machine needle 17 passes is formed in a central portion except for both right and left ends thereof. When the sewing needles 17 are arranged in a staggered manner and the sewing needles 17 are arranged in a staggered manner, the needle holes 30 b are also formed in a staggered manner corresponding to the arrangement of the sewing needles 17.

The thread hook 64 located above the holding member 30 is provided with a sewing thread Y which is pulled out from a sewing thread bobbin located above and behind the holding member 30 and travels obliquely to the surfaces of the plate members Ta and Tb. To wind the sewing machine needle 17 projecting upward through Ta and Tb once or to simply press the sewing machine needle 17 around, and then to hook the sewing thread Y on the hook of the sewing machine needle 17 as the sewing machine needle 17 descends. As shown in FIG. 1, a thread hook 64 is formed in a vertical cylindrical shape, and a sewing thread Y is inserted through the cylindrical thread hook 64 so that the thread hook 64 is attached to the sewing needle 17. The thread may be rotated around the circumference, or a ring-shaped thread hook may be used instead of the cylindrical thread hook 64, and the ring-shaped thread hook may be rotated around the sewing needle 17. In addition, the sewing thread Y is inserted into the distal end hole of the downward arm-shaped thread hook.
The sewing thread Y may be swung in the width direction behind the sewing needle 17 to simply press the sewing thread Y against the sewing needle 17. The sewing needle 17
In the case of a staggered arrangement, the thread hook 64 is also
Are arranged in a zigzag pattern corresponding to the arrangement of.

[0013]

A tatami floor plate Ta, Tb is supplied between the tatami floor receiving base 10 and the holding member 30, and a large number of sewing threads Y are drawn out from a spool (not shown) prepared at an arbitrary position. Pass the tip through the thread hook 64, and
When the multi-needle sewing machine is driven with any means fixed at an appropriate position such as the front end of a, Tb or the front part of the holding member 30, the needle base 16 rises when the plate materials Ta, Tb stop, and the sewing needle 17 pierces the plate materials Ta and Tb, and
The tip of 7 protrudes above the plate materials Ta and Tb. Thereafter, each thread hooking tool 64 makes one rotation around the corresponding sewing needle 17 or swings in the width direction on the rear side, so that the tatami flooring plate materials Ta, Tb and the thread hooking tool 64 are connected to each other. The sewing thread Y in between presses the protrusion of the sewing needle 17.

Next, the needle base 16 is lowered, and the sewing thread Y which is in contact with the sewing needle 17 with the lowering of the needle base 16 is moved.
As the sewing needle 17 is pulled down from the tatami floor T by hooking on the hook 7, the sewing thread Y forms a loop and is passed through the tatami floor T, and then the tatami floor T is moved forward by a predetermined length. Sent. Then, the needle base 16 is raised again, the sewing machine needle 17 is pierced into the tatami floor T, and thereafter, by repeating the above, a large number of rows of single-ring stitches are applied to the tatami floor T to form the tatami floor T. The upper and lower insulation boards Ta and the expanded polystyrene plate Tb therebetween are integrated by sewing.

FIG. 7 shows the stitches formed in this manner, where Ya is a loop of a sewing thread Y formed on the lower surface of the tatami floor T, and Yb is formed on the upper surface of the tatami floor T. This is a transition portion of the sewing thread Y. A tatami mat (not shown) is attached to the upper surface of the tatami floor T, and the crossover portion Yb is covered with the tatami mat, while the lower loop Ya is exposed without being covered. However, since the sewing machine needle 17 is pierced from below into the tatami floor T, the needle holes on the lower surface of the tatami floor T are opened in a straight line, so that the seam line composed of the loop Ya meanders right and left. And improve the appearance by forming a straight line.
On the other hand, on the upper surface of the tatami floor T, the piercing direction of the sewing machine needle 17 may swing back and forth and right and left due to the piercing resistance of the tatami floor T with respect to the sewing machine needle 17. The seam line composed of the crossover portion Yb is shifted from right above the hole and meanders to the right and left. Since the crossover portion Yb is formed by one sewing thread Y, the unevenness on the upper surface is smaller than when the loop Ya is formed on the upper surface, and the feel from the top of the tatami mat is improved.

The holding member 30 is raised and lowered, and the tatami floor T
When the tatami floor T is lifted from the tatami floor T at the time of forward feeding, and the tatami floor T is pressed down when the sewing machine needle 17 rises, the frictional resistance when the tatami floor T is advanced is reduced. When a woven sheet made of nonwoven fabric, paper, synthetic resin tape, or other lining sheets is provided on the lower surface, damage to these lining sheets is prevented. Further, the sewing needle 17 on the needle base 16, the long hole 30 b on the holding member 30 and the thread hook 64 on the thread hook support table 62 are respectively moved forward and backward by 2.
When the rows are arranged in a staggered manner, the number of the needle holes arranged in the width direction of the tatami floor T is reduced by half and the positions of the needle holes are dispersed as compared with the case of arranging them in a single row. Stress concentration when bending stress is applied is avoided, and the tatami floor T is less likely to break.

[0017]

In FIG. 2, reference numeral 10 denotes a support for the tatami floor T, which is supported between left and right side frames (not shown). A guide roller 11 is provided at the rear of the receiving table 10, and a guide roller 11 and a feed roller 12 are sequentially provided at the front so as to have the same upper surface height. A ratchet 14 is fixed to a shaft 13 of the feed roller 12. , Guide roller 11 and feed roller 12
Are provided so that the height can be adjusted in accordance with the thickness of the tatami floor T, and the pressing roller 15 is placed on the receiving table 10, the guide roller 11, and the feed roller 12. It is in contact with the upper surface of the floor T.

A needle base 16 which is long in the width direction is provided below the receiving base 10 so as to be able to move up and down, and sewing needles 17 for single-ring stitches are implanted on the needle base 16 in a two-row staggered fashion. Reference numeral 18 denotes a lifting guide for raising and lowering the needle base 16 along a vertical line. A widthwise main shaft 20 that rotates clockwise by motor driving is provided below the needle base 16, and cranks 21 fixed to both left and right ends of the main shaft 20 are provided.
One end of a connecting rod 22 is connected to the end of the needle rod, and the end of the needle base 16 is connected to the other end of the connecting rod 22 to form a slider / crank mechanism. Therefore, spindle 2
The needle stand 16 moves vertically up and down with the rotation of 0, and when the needle stand 16 rises, the sewing machine needle 17 passes through the needle hole of the receiving stand 10 and the tatami floor T
And the tip of the sewing needle 17 projects above the tatami floor T.

At the side of the end of the main shaft 20, a lower support shaft 2 is provided.
A swing lever 24 is provided which can swing back and forth with the fulcrum 3 as a fulcrum. A slider attached to the tip of the crank 21 is provided in a slot 24a provided along the length of the swing lever 24. The crank 21 and the swing lever 24 form a swing slider / crank mechanism. The lower end of a vertical feed rod 27 is connected to the tip of an arm 26 projecting forward from the lower end of the swing lever 24, and the upper end of the feed rod 27 is swingable on the shaft 13 of the ratchet 14. The feed pawl 29 attached to the other end of the V-shaped lever 28 is engaged with the teeth of the ratchet 14, and the V-shaped lever 28 is turned for each rotation of the crank 21. Is reciprocated one time back and forth, and at the time of its forward swing, the feed roller 12 is rotated clockwise by a predetermined angle,
The tatami floor T is advanced in the direction of arrow A by a predetermined distance.

A pressing member 30 for pressing the tatami floor T from above is provided above the receiving table 10 so as to be able to move up and down.
The pressing member 30 is long in the width direction, has upward ribs 30a along the edges of the front and rear ends thereof, and has a number of long holes 30b between the front and rear ribs 30a (see FIGS. 3 and 5). ) Are opened in a zigzag pattern corresponding to the arrangement of the sewing needles 17, specifically, over a distance equal to or more than the feed length from directly above the sewing needles 17 in the feed direction of the tatami floor T. Then, a clip 31 for fixing the thread end of the sewing thread Y is fixed to the rear of each of the long holes 30b via an elongated plate-shaped clip base 32 parallel to the rib 30a.

As shown in FIGS. 3 and 6, guide pins 34 are fixed upright on both front and rear ends of the holding member 30 via spacers 33 along both ends thereof.
The block 35 is fixed in the middle. The guide pin 34 is inserted into a hole of a guide 37 fixed to a side frame 36 (see FIG. 3).
The other end of the connecting rod 38, one end of which is fixed to 5, extends outwardly in the width direction through a vertically long hole provided in the side frame 36, and its protruding end extends from the main shaft 20. It moves up and down by interlocking.

That is, a first intermediate shaft 40 driven from the main shaft 20 via a wrapping transmission 39 is provided in parallel with the main shaft 20 behind the main shaft 20 (to the left in FIG. 2). Above the shaft 40, a second intermediate shaft 43 driven from the first intermediate shaft 40 via a first bevel gear 41 and a second bevel gear 42 is provided vertically, and a cylinder is provided at the upper end of the second intermediate shaft 43. The cam 44 is fixed. The side frame 36 (FIGS. 3 and 4) is inserted into the groove 44a of the cylindrical cam 44.
Roller 47 at the rear end of a horizontal lever 46 having a fulcrum 45 is fitted to the upper end of a vertical first link 48 with a front end of the horizontal lever 46.
The front end of a second link 50 in the front-rear direction having a fulcrum 49 below the roller 47 and the rear end of a third link 51 in front of the second link 50 are respectively pin-coupled, and a fulcrum 52 is attached to the front end thereof. The vertical end of an L-shaped lever 53 having a pin is connected with a pin, and the horizontal end of the
Are connected.

Therefore, when the main shaft 20 makes one rotation, the cylindrical cam 44 makes one rotation, and the horizontal end of the L-shaped lever 53 reciprocates up and down one time. However, the rising time is set when the tatami floor T is moved forward by the rotation of the ratchet 14.
In FIG. 2, the dotted line 53A indicates the roller 4
7, horizontal lever 46, first link 48, second link 5
0, third link 51, L-shaped lever 53, connecting rod 38
And a link mechanism comprising the block 35.

Below the cylindrical cam 44 (see FIG. 2),
A third intermediate shaft 56 in the front-rear direction, which is driven from the second intermediate shaft 43 in the vertical direction via a third bevel gear 54 and a fourth bevel gear 55, is provided above the third intermediate shaft 56 at the front upper side. A vertical fourth intermediate shaft 59 driven through a fifth bevel gear 57 and a sixth bevel gear 58 is provided.
9, a crank 60 is fixed at the upper end.
The both ends of a thread hook support 62 are connected to a crank pin 61 at the tip of the thread hook via a hanging bracket 63.
Are disposed above the pressing member 30.

The hanging fittings 6 at both ends of the thread hook support base 62
3 comprises a vertical portion 63a extending upward from both ends of the thread hook support base 62 and a horizontal portion 63b projecting laterally from the upper end of the vertical portion 63a. The crank pin 61 is rotatably fitted, and the thread hook support base 62 (including the hanging bracket 63) and the left and right ends of the crank 60 form a parallel crank mechanism.
A large number of circular holes 62 corresponding to the sewing needles 17 on the needle base 16 are formed on the threading support base 62 (see FIGS. 3 and 5).
a is opened, and a cylindrical thread hook 64 communicating with the circular hole 62a is fixed to the lower surface of the needle base 16 downward. Therefore, when the left and right cranks 60 make one rotation around the fourth intermediate shaft 59, each of the thread hooks 64 moves the corresponding sewing needle 17
Make one revolution along circle 65 (see FIG. 3).

In the above structure (see FIG. 2), the main shaft 2
When 0 rotates, the needle base 16 moves up and down for each rotation,
Further, the feed V-shaped lever 28 of the ratchet 14 reciprocates one time back and forth, and at the same time, the driving cylindrical cam 44 of the pressing member 30 makes one turn, and the turning crank 60 of the thread hook 64 makes four turns. And the sewing needle 17 on the needle base 16
Is located below the tatami floor T, the cylindrical cam 44 raises the pressing member 30 from the tatami floor T by a slight amount via the link mechanism 53A.
9 rotates the ratchet 14 clockwise to advance the tatami floor T forward by the sewing pitch.

When the advance is completed, the cylindrical cam 44 presses the pressing member 30 against the tatami floor T via the link mechanism 53A until the next advance is started. And the needle base 16
Rises, the sewing needle 17 penetrates the tatami floor T, and its tip projects above the pressing member 30 (FIGS. 1 and 3).
And FIG. 5), the thread hook 64 pivots along the circle 65 around the sewing needle 17 and moves the sewing thread Y to the sewing needle 17.
And the wound sewing thread Y is attached to the next sewing needle 1.
7 is formed into a loop with the descent of the floor 7 and is drawn below the tatami floor T.

In this embodiment, the third bevel gear 5 is rotated while the rotation of the main shaft 20 is transmitted to the thread hooking crank 60.
The speed is increased by the mesh between the fourth bevel gear 55 and the fifth bevel gear 57 and the sixth bevel gear 58,
During the rotation, the crank 60 rotates four times, and in one of the rotations, the thread hook 64 winds the sewing thread Y around the sewing needle 17 protruding above the tatami floor T. In the remaining three rotations, the thread hook 64 is simply rotated. Since the idle rotation is performed, an expensive cam is used for rotating the crank 60, and the equipment cost can be reduced as compared with a case where the crank 60 is rotated only at the time of threading. Further, since the clips 31 are provided in the holding member 30 corresponding to the respective long holes 30b, the thread ends can be temporarily hooked to the clips 31 at the start of operation or when the sewing thread Y is cut.

The second link 50 and the third link 50 are arranged in a straight line in the link mechanism 53A for moving the holding member 30 up and down.
Since the toggle mechanism including the link 51 and the first link 48 for bending the connecting portion thereof up and down is arranged, the third link 51 is moved up and down with a weak force.
The pressing member 30 is strongly pressed via the L-shaped lever 53 and the tatami floor T can be firmly fixed. And
When the thickness of the tatami floor T is changed, the horizontal position of the L-shaped lever 53 can be changed simply by changing the fixing position (height) of the cylindrical cam 44 with respect to the second intermediate shaft 43 (see FIG. 2) in the vertical direction. The set height of the pressing member 30 connected to the portion can be changed.

In the embodiment shown in FIG. 8, a tatami floor plate Ta,
A pressing member is formed by providing bars 70 in the width direction in parallel before and after the stitching needles 17 in a staggered arrangement protruding above Tb. On the other hand, a bar-shaped thread hooking support 71 long in the width direction is provided above the sewing machine needle 17 so as to be swingable in the width direction (the direction of the arrow P), and an end surface 71a of the thread hooking support 71 is rotated around a vertical axis. Is pressed against the peripheral surface of the rotating plate cam 72. A thread hook 73 is provided on the front and rear faces of the thread hook support base 71 in correspondence with the sewing needles 17 in the front row and the rear row, respectively.
Are provided alternately.

The above-described thread hook 73 is provided on the thread hook support base 71.
A first arm 74 extending downward from the front or rear surface of the first arm 74 and a second arm 7 fixed to the front surface of the central portion of the first arm 74 and extending downward in parallel with the first arm 74
5 and the first arm 74
A thread 74a through which the sewing thread Y can be inserted is opened at the lower end of the first arm 74, the second arm 75 extends below the lower end of the first arm 74,
A thread hooking step 75a is formed on the right edge thereof, and when the thread hooking support base 71 swings left and right by the rotation of the plate cam 72, the first arm 74 moves rearward and left of the corresponding sewing needle 17 to the left and right. And the second arm 75 corresponds to the sewing needle 1
7 between the front and the left.

Therefore, when the machine is operated by passing the sewing thread Y through the thread 74a of the first arm 74, when the sewing machine needle 17 penetrates the tatami floor boards Ta and Tb and protrudes upward, the thread hooking support base 71 is moved. Swing from left to right, the first arm 7
4 is behind the corresponding sewing needle 17 and the second arm 7
5 swing forward of the same sewing needle 17 respectively, and at this time, the second arm 75 applies the sewing thread Y to the threading step 75a.
The sewing thread Y between the thread 74a and the threading step 75a is pressed against a portion of the sewing machine needle 17 below the hook to bend into a mountain shape. Next, as the sewing needle 17 descends, the contact portion of the sewing thread Y with the sewing needle 17 is hooked on the hook of the sewing needle 17 and descends, and the sewing thread Y is detached from the thread hooking step 75a. It is passed through the tatami floor plates Ta and Tb. Thereafter, the tatami floor boards Ta and Tb are advanced by the sewing pitch, and the thread hook 73 swings to the left and returns to the standby position to the left of the corresponding sewing needle 17. Note that the second arm 75 can be omitted by making the first arm 74 enter the back of the sewing needle 17 deeply.

[0033]

As described above, according to the first aspect of the present invention, a large number of single-ring sewing needles are implanted upward below a support for supporting a tatami floor plate from below. A needle table is provided so as to be able to move up and down, and a pressing member is provided above the receiving table to hold the plate material to prevent escape when the sewing needle penetrates the plate material. Is a multi-needle sewing device for a tatami floor, which is provided with a thread hooking means for the sewing needle of the sewing machine. Single-ring sewing can be performed by inserting a sewing needle upward.
Therefore, even when the thickness of the tatami floor changes due to the lot change, the distance between the tip of the sewing needle removed from the tatami floor and the tatami floor remains unchanged, that is, the slack of the sewing thread loop applied to the tip of the sewing machine needle is reduced. It is constant irrespective of the thickness of the floor, so that it is not necessary to change the vertical movement of the sewing needle and the feed length of the tatami floor to prevent the sewing thread loop from coming off the sewing needle.

In addition, since the sewing needle is inserted through the tatami floor from below, the needle holes on the lower surface of the tatami floor are opened in a straight line.
Therefore, the seam line composed of the sewing thread loop forms a straight line without meandering to the left and right, thereby improving the appearance. On the other hand, on the upper surface of the tatami floor, due to the penetration resistance of the tatami floor with respect to the sewing machine needle, the position of the needle hole is shifted from right above the needle hole on the lower surface, and the seam line formed of the crossover portion may meander left and right. However, since the seam line is covered with the tatami mat, there is no problem in appearance. And since the above-mentioned crossing part is formed by one sewing thread, unevenness due to the sewing thread is reduced as compared with the case where the sewing thread loop is formed on the upper surface, and the feel from the top of the tatami mat is improved.

According to a second aspect of the present invention, in the first aspect of the present invention, the holding member is formed so as to be able to move up and down, and the holding member is pressed against the surface of the plate member when the plate member is at rest. Because it is made to float from the surface at the time of forward feeding of the plate material, the frictional resistance between the tatami floor and the cradle or the holding member at the time of forward feeding is reduced, and nonwoven fabric, paper, When a lining sheet made of a fabric or the like is provided, the lining sheet is prevented from being damaged, the tatami floor is securely fixed when the sewing machine needle is pierced, and the piercing of the sewing machine needle is facilitated.

According to a third aspect of the present invention, in the first or second aspect of the present invention, a large number of sewing needles and thread hooks are provided in two rows in front and rear, respectively, in a staggered manner. Since the interval of the back row is set to about half of the front feed pitch of the tatami floor, the number of needle holes arranged in the width direction of the tatami floor is reduced by half compared to the case where these are arranged in a single row, and the position of the needle hole Are dispersed, so that the tatami floor becomes hard to break.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the thread hook is swung around a sewing needle projecting above the tatami floor plate. Since the sewing thread is wound around the sewing needle,
Even when the holding member moves up and down with respect to the thread hook with the change in the thickness of the tatami floor, the sewing thread can be reliably hooked on the sewing needle, and operation errors are further reduced.

According to a fifth aspect of the present invention, in the invention according to any one of the first to third aspects, the thread hooking tool is provided in the width direction behind the sewing needle protruding above the tatami floor plate. Since the sewing thread is swung to press the sewing thread against the sewing needle, the structure of the driving device is simplified, and the device can be manufactured at lower cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an embodiment.

FIG. 2 is a side view showing details of the embodiment.

FIG. 3 is a plan view of a main part of FIG. 2;

FIG. 4 is a side view of a link mechanism for lifting and lowering a holding member.

FIG. 5 is a cross-sectional view illustrating a relationship between a pressing member and a thread hook.

FIG. 6 is a cross-sectional view showing a mounting portion of a pressing member.

FIG. 7 is a perspective view of a seam.

FIG. 8 is a perspective view showing a main part of another embodiment.

FIG. 9 is a sectional view showing the relationship between a conventional tatami floor and a sewing needle.

[Explanation of symbols]

T: Tatami floor Ta: Insulation board (plate material) Tb: Expanded polystyrene plate (plate material) Y: Sewing thread Ya: Loop Yb: Crossing section 10: Cradle 12: Feed roller 14: Ratchet 16: Needle base 17: Sewing needle 20 : Main shaft 21: Crank 22: Connecting rod 24: Swing lever 27: Feed rod 28: V-shaped lever 29: Feeding pawl 30: Holding member 30 b: Long hole 30 A: Supporting means of holding member 31: Clip 34: Guide pin 35 : Block 38: Connecting rod that moves up and down by driving 40: First intermediate shaft 43: Second intermediate shaft 44: Cylindrical cam 53A: Link mechanism 56: Third intermediate shaft 59: Fourth intermediate shaft 60: Crank 62: Threading support Table 62a: Circular hole 64: Threading tool 65: Circle indicating the turning locus of the threading tool 70: Holding member 71: Threading support base 72: Cam 73: yarn hooking member 74: first arm 74a: weaving 75: second arm 75a: yarn hooking step portion

Claims (5)

(57) [Claims] 1. A plurality of tatami floor boards such as an insulation board and an expanded polystyrene board are superimposed and intermittently advanced, and at the time of rest, a large number of sewing needles arranged in the width direction are pierced into the board to pierce the board. In a multi-needle sewing apparatus for a tatami floor that performs single-ring sewing in a row, a large number of single-ring sewing needles are planted upward below a receiving stand for supporting a tatami floor plate from below. A needle member is provided so as to be able to move up and down, and a pressing member is provided above the receiving table to hold the plate material and prevent escape when the sewing needle penetrates the plate material, and the pressing member is provided above the pressing member. A multi-needle sewing apparatus for a tatami floor, comprising thread hooks for a large number of sewing needles. 2. The multi-needle sewing device for a tatami floor plate material according to claim 1, wherein the pressing member is formed so as to be movable up and down.
A multi-needle sewing machine for a tatami floor provided with elevating means for pressing the pressing member against the surface of the plate member when the plate member is stationary and lifting the plate member from the surface when the plate member is moved forward. 3. A multi-needle sewing apparatus for a tatami floor according to claim 1, wherein a plurality of sewing needles are provided on a needle base, and a plurality of threading tools are provided on a threading support base. A multi-needle sewing machine for tatami floors, which is provided in a zigzag pattern and in which the interval between the front and rear of the sewing needle and the thread hook is set to about half of the forward feed pitch of the tatami floor plate. 4. A multi-needle sewing apparatus for a tatami floor according to any one of claims 1 to 3, wherein the thread hook rotates around a sewing needle projecting above the tatami floor plate material. A multi-needle sewing device for tatami floors that winds sewing threads around needles. 5. The multi-needle sewing apparatus for a tatami floor according to claim 1, wherein the thread hook swings in the width direction behind the sewing needle protruding above the tatami floor plate. A multi-needle sewing apparatus for a tatami floor, wherein a sewing thread is pressed against the sewing needle.