JPS6127580Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is based on the so-called tatami edges, which correspond to the edges in the length direction of the tatami mat, which are flat-stitched and sewn on the top side and folded back, and with the return straw applied to the lower corners. This relates to a tatami edge sewing machine used for sewing and finishing the so-called stile corresponding to the widthwise edge of the tatami mat together with the folded part of the tatami face, which A threading needle that enters and exits the tatami body and a thread-drawing hook needle that enters and exits the tatami body from the side edge of the tatami body, the sewing thread threaded through the threading needle is received by the hook needle inside the tatami body, and is drawn to the tatami body side. The present invention relates to an improvement of a sewing machine which performs sewing similar to hand-stitched raised needle-like regular reverse stitching by pulling out to the edge.

A sewing machine of the above type is known from Japanese Patent Publication No. 43-11630 or Japanese Patent Publication No. 43-11631.
As can be seen from Figures 1 and 2, its configuration is as follows:
A threading needle 3 having a threading hole 1 bored near the tip and a recess 2 cut out near one of the holes, and a straight thread having a threading hook 4 near the tip. the threading needle 3;
The tatami body 7 is pulled from the back side of the tatami body 7 with the sewing thread 6 passed through the threading hole 1 stretched over the recess 2.
At the same time, the tip of the hook 5, which has entered the tatami body 7 from the side edge 7a of the tatami body 7, rubs the side surface of the tatami body 7 and comes into contact with the concave part 2. The threading needle 3 and the hook 5 enter the gap 8 with the sewing thread 6, and after the hook portion 4 of the hook 5 passes through the gap 8, the threading needle 3 and the hook needle 5 each exit the tatami body 7. The key point is that the hook portion 4 is adapted to hook the sewing thread 6 passed through the threading needle 3 and pull it out to the side edge 7a of the tatami body 7. Thus, the threading needle 3 and the hook needle 5 move intermittently along the side edge 7a of the tatami body 7 together with a body (not shown) that holds them, and during the pause period of this movement, the above-mentioned entry and exit operations are performed. Each time this operation occurs, a thread transfer means such as a thread transfer needle (not shown) provided in the machine body takes over the end ring of the sewing thread pulled out to the side edge of the tatami body from the hook needle, and threads the end of the sewing thread on the back side of the tatami body. The needle is moved to a position where it can be engaged with the insertion of the needle, and in this way the edge of the tatami mat is sewn in a manner similar to hand-sewn up-needle regular reverse stitching. Note that the body is provided with a receiving plate (not shown) that presses the tatami mat 7 from above and below. Also threading needle 3
is moved into and out of the tatami body from the back surface of the tatami body through the lower clamping plate with a predetermined stroke by a reciprocating drive means (not shown) provided in the body. In this case, the threading needle 3 is linear and enters and exits perpendicularly to the plane of the tatami mat.
There are straight types that enter and exit diagonally in the sewing direction with respect to the plane of the tatami body, and curved types that enter and exit in an arc shape in the sewing direction. In the first style, the sewing line of the sewing thread that appears on the side edge of the tatami body is diagonal, and in the latter two styles, the sewing thread is passed diagonally in the sewing direction within the tatami body, so that the sewing line that appears on the side edge of the tatami body is diagonal. The seam line appearing in the section can be vertical. In any case, the recess 2, which is formed as a notch in the threading needle 3 and is brought into contact with the side surface of the tip of the hook, is provided on the side surface of the threading needle 3 on the opposite side to the sewing direction. Further, as shown in the figure, the hook 5 is moved into the tatami body 7 from the tatami body side edge 7a with its rear end supported by a support member 9 that linearly reciprocates with a predetermined stroke in a reciprocating drive means provided in the body. This operation is performed by a plate-shaped guide member 10 at the rear.
At the same time, the front part is guided through the guide hole 13 of a similar guide member 12 that is in contact with the side edge 7a of the tatami body, so that it is guided in a straight line. Ru.

In the sewing machine having the above configuration, it is important that the tip of the hook needle 5 reliably enters the gap 8 between the recess 2 of the threading needle 3 and the sewing thread 6 stretched over the recess 2. However, especially when the hook 5 enters the tatami body 7 from the side edge 7a of the tatami body 7, it deflects in the advancing direction due to the laminated state and resistance of the straw that makes up the tatami body 7, and its tip ends in the gap 8. This is likely to result in miscatch of the sewing thread 6 without entering the thread.

For this reason, conventionally, as shown in FIG. 1, the guide hole 13 of the guide member 12 applied to the side edge 7a of the tatami body suppresses the deflection of the tip of the hook 5 when it enters the tatami body 7. By making the threading needle 3 considerably thicker, the recess 2 is made deeper and the gap 8 is made as large as possible, and the guide slope 14 is formed diagonally wide so as to be continuous with the recess 2. In this way, the guide slope 14 is made wide. By causing the tip of the hook 5 to collide with and rub against the tip of the hook, and to be guided obliquely toward the gap 8, the tip of the hook 5 can enter the gap 8 even if the tip swings slightly in the direction of movement. It is something. By making the threading needle 3 thicker, when the tip of the hook needle 5 contacts the recess 2 with its side surface and enters the gap 8 to the point where the hook 4 crosses, the tip of the hook needle 5 faces toward the opposite side from the contact surface. Since the bending of the hook 4 cannot help but be large, the guide member 12
The thickness t of the threading needle 3 is reduced so that the guide hole 13 can be easily bent, and a recess 15 for engaging the recess 2 of the threading needle 3 is provided on the rear side surface of the hook 4 of the hook 5. It was also possible to temporarily reduce the deflection of the hook 5 by advancing the hook 5 until the recesses 2 and 15 engaged with each other.

However, in such a conventional configuration, in order to make the threading needle 3 thicker, the needle threading becomes difficult and the needle hole becomes large, which is extremely inconvenient for good sewing. There is an inconvenience that a large deflection is forced intensively on a short portion on the tip side starting from point 12. and,
In such a sewing machine, the sewing thread 6 to the hook portion 5 is generally
In order to ensure that the hook is caught, the threading needle 3 is made to enter the retracting motion before the hook 5 enters the retracting motion, but at this time, the recess 2 of the threading needle 3 is deep, Furthermore, when the concave portion 15 of the hook needle 5 engages with the threading needle 5, there is a disadvantage that the resistance to the retracting operation of the threading needle 3 increases.
When the tip of the hook 5 advances to the point where both the recesses 2 and 15 engage, the degree of protrusion of the tip beyond the threading needle 3 becomes large, resulting in the inconvenience that the hook 4 catches the straw. High risk.
The biggest problem is that the tip of the hook 5 collides with the large guide slope 14 of the threading needle 3 and is rubbed, so the impact and friction are large, causing the tip of the hook 5 to wear quickly or break. There is a very high risk of damage to the sewing thread, which makes it more likely that the sewing thread will be miscatched, and by making the guide hole 13 of the guide member 12 in a form that allows the hook needle 5 to easily bend, the hook needle 5 may be damaged. When the thread enters the tatami mat, deflection in the direction of movement tends to occur in front and behind the guide hole 13, which impairs the accuracy of catching the sewing thread.

The present invention aims to solve the above problems.

For this purpose, the present invention aims at connecting the guide hole 13 of the guide member 12, which is applied to the side edge of the tatami body and guides the hook needle, to the contact surface of the tip side of the hook needle to the recess of the threading needle. It is formed in the shape of a groove with a side opening that allows deflection of the hook toward the opposite side. Then, it moves to a state position in which the side opening of the guide hole is covered so as to prevent deflection of the crochet needle, and a state position in which the side opening of the guide hole is opened to allow the deflection displacement of the crochet hook. A possible cover member is provided. A mechanism for moving the cover member is provided.

According to the present invention, when the cover member is moved by the moving actuation mechanism to a position where it covers the side opening of the guide hole formed in a groove shape, the hook is accurately guided in a straight line so that it does not deflect in all directions. can. In addition, when the cover member is moved by the movement mechanism to the position where the side opening of the guide hole is opened, the side surface of the tip of the hook needle swings toward the side opposite to the contact surface side of the recess of the threading needle. The hook can be guided to a state that allows displacement. Therefore, the latter position is maintained while the hook advances through the tatami body until the side of the tip of the hook rubs against the recess of the threading needle, and then the side of the tip of the hook rubs against the recess of the threading needle. By setting the movement operation timing of the cover member by the movement operation mechanism so that the cover member takes the latter state position while it is in contact with the hook, there is no need for the tip of the hook to collide with the guide slope of the threading needle, and the recess of the threading needle It can be inserted accurately into the gap between the threading needle and the stretched sewing material, and the deflection of the hook needle due to rubbing contact with the concave part of the threading needle on the side surface of the tip of the next hook needle can be inserted into the side opening of the guide member's guide hole. In allowing the deflection displacement of the middle part of the crochet needle, the crochet needle can be easily allowed to have a small flexural deformation over almost the entire length of the crochet needle, without forcing the crochet needle to bend in a short local range. Therefore, it is possible to take the sewing thread from the threading needle to the crochet needle without the need to make the threading needle thicker or to provide a recess in the crochet needle for engagement with the recess of the threader needle, and without the risk of damaging the needle. This means that the sewing operation can be performed reliably without any mis-scratch, and can be performed safely, smoothly, and accurately.

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 3A to 3C, the thickness T of the guide member 12 applied to the side edge 7a of the tatami body for guiding the hook 5 through it is made as thick as possible compared to the conventional one. Therefore, the guide hole 13 is made long. As shown in FIG. 3A, the guide hole 13 is inserted into the tatami body 7 from the side edge 7a of the tatami body toward the position where the tip of the hook needle 5 comes into contact with the recess 2 of the threading needle 3 on the side. When entering, the swinging of the hook 5 in all directions is strongly restrained, and the course of the hook 5 is forced into a straight line toward the predetermined position. is maintained until the side surface is just about to contact the recess 2 of the threading needle 3 as shown in the figure. When the tip of the hook 5 reaches that position, the hook 5 can be allowed to deflect laterally toward the side opposite to the side of the tip that contacts the recess 2 of the threading needle 3. The side of the guide hole 13 of the guide member 12 is expanded in that direction, and in this state, as shown in FIG. It is designed so that it can be taken while in contact with the person. Then, as shown in FIG. 3C, when the tip of the hook 5 exits, for example, the side edge 7a of the tatami body, the guide hole 13 of the guide member 12 opens to expand to the original state shown in FIG. 3A. The side part that was previously closed is closed so as to be ready for the next plunge stroke of the hook. The timing for closing the guide hole 12 is from immediately after the point of the hook needle 5 leaves the recess 2 of the threading needle 3 on the side surface to just before the point of the next hook needle 5 enters the tatami side edge 7a. It can be set at any time.

According to this configuration, the hook needle 5 is directed by the guide member until the pointed end enters the tatami body 7 from the side edge 7a of the tatami body 7 and just before the side surface contacts the recess 2 of the threading needle 3. Since it is strongly restricted by the 12 long guide holes 13 and is forced to move in a straight line, there is no possibility that it may sag in front and behind the guide holes 13 due to the laminated state and resistance of the straw that makes up the tatami body 7. There is almost no difference, and the robot moves almost exactly as guided by the guide hole 13. Therefore, it is possible to preferably set the guide hole 13 of the guide member 12 so that the tip of the hook needle 5 is directed toward the bottom surface of the recess 2 of the threading needle 3, so that the tip of the hook needle 5 can advance exactly in almost the same direction. Therefore, the recess 2 is made shallower, and the guide slope 14 is
The threading needle 3 can be made thinner by minimizing or almost eliminating the threading, and even in this way, the tip of the hook needle 5 will surely enter the gap 8 and the sewing thread will always be accurately threaded without miscatch. This means that it can be hooked. In this way, the sewing thread can be accurately hooked without the tip of the hook needle 5 hitting the guide slope 14, eliminating the risk of wear or breakage of the tip, and the side surface is formed into a recess. It is possible to minimize the deflection of the hook needle 5 when it comes into contact with the guide hole 13 in the direction of the deflection.
by opening the sides of the
Since the deflection displacement in the middle part of the hook 5 in that direction is allowed, the deflection of the deflection is not specified in a short range starting from the guide member 12.
Starting from the rear end of the support by the rear guide member 10 or support member 9, this can be done evenly over almost the entire length of the hook 5, and can be done easily. Further, since the flexure of the hook 5 is small, there is no need to provide a recess 15 on the side surface of the hook 5 and advance it to the point where it engages with the recess 2, as in the conventional case. In this way, wear, breakage, and fatigue of the hook needle 5 can be effectively prevented, and the suture thread hooking operation can be performed smoothly and accurately without mis-catching, thus solving the conventional problems.

Next, the guide member 12 for achieving the above functions
An example of the configuration of the portion will be described based on FIGS. 4 to 6.

In the embodiment of the guide member shown in FIGS. 4A and 4B, two plate-shaped block members 16 and 17 of a required width that define the thickness of the guide member are provided with a predetermined interval between them, and bolts, etc. The block materials 1 are arranged face-to-face on the left and right in an integrally connected manner using a connecting means (not shown in the drawing).
A plate-shaped cover member 18 is clamped between 6 and 17 so as to be vertically slidable. The hook 5 is inserted into the lower position of the inner surface of one block material 16 so as to prevent it from swinging in three directions (up, down, and to one side), and to allow swinging only in the remaining one side. The guide hole 13 is formed in the shape of a U-shaped linearly extending groove having a side opening where the guide hole 13 is opened. The guide hole 1
The direction of the side opening that allows the swinging displacement of the crochet needle 5 in 3 is the direction opposite to the contact surface side of the recess 2 of the threading needle 3 on the pointed side surface of the crochet needle 5. And the guide hole 13 of the cover member 18
There is a cutout step 1 at the bottom of the side facing the side opening.
9 is formed. In this way, the cover member 18 slides downward to position the cutout step 19 below the side opening of the guide hole 13, thereby covering the side opening of the guide hole 13 and hooking the hook at the side opening. The hook 5 is in a state in which deflection in all directions is prevented. The cover member 18 also slides upward to position the cutout step 19 at the side opening of the guide hole 13, thereby opening the side opening of the guide hole 13 and allowing the hook 5 to open at the side opening. The hook 5 is set in a position that allows deflection in one direction, and is now in a state in which deflection of the hook 5 in the remaining three directions is prevented. The following movement operating mechanism is provided for vertically sliding movement of the cover member 18. That is, in the upper parts of both the block materials 16 and 17, there are holes 20 that face each other and pass through in the lateral direction.
21, and a slider 22 whose tips can move in and out of the holes 20, 21 is slidably attached to an underframe 23 integrally attached to the side of the block material 16. The slider 22 is connected to the fulcrum 2 by a rod 24 that is pulled and pushed at predetermined timing by a cam or the like in conjunction with the drive device of the sewing machine.
It is connected to a Becrank-shaped lever 26 which is slid about 5, so that the tip can be moved in and out of the holes 20 and 21. The tip of the slider 22 is formed into a pointed shape with a slope 22a, and a hole 27 that engages with the slope 22a is formed in the cover member 18.
It is set in. In this way, slider 2
2 is retracted, the cover member 18 is lowered by, for example, a spring (not shown), the notch step 19 is below the guide hole 13, and the cover member 18 is lowered by a spring (not shown).
covers and guides the hook 5 on all sides, but when the slider 22 moves forward as shown by the imaginary line, the cover member 18 is pushed up and slid by the slope 22a, and the notch step 19 is moved into the guide hole 13. The side opening of the guide hole 13 opens laterally at the cutout step 19, and the hook 5 is allowed to be displaced in that direction. . By moving the slider 22 forward and backward at predetermined timings during the insertion and withdrawal operations of the hook needle as described above, the desired one side of the guide hole 13 can be expanded to open and contracted to close. The desired effect is achieved. In this embodiment, since the permissible direction of deflection displacement of the hook by opening the side opening of the guide hole 13 is the lateral direction (horizontal direction),
It is applied to sewing machines in which the threading needle is straight and enters and exits perpendicularly to the surface of the tatami body. Note that the guide hole 13 is configured to form a notch groove 28 necessary for moving the sewing thread hooked on the hook 5 downward in cooperation with the notch stepped portion 19.

The embodiment of the guide member shown in FIG. 5 has almost the same construction as the embodiment shown in FIG.
9 is in the raised position, the notch step 19 is located above the guide hole 13 and the side opening of the guide hole 13 is covered, and when the slider 22 moves forward (the drawing shows this state). ) cover member 18
is lowered so that the notched stepped portion 19 aligns with the guide hole 13 and the side opening of the guide hole 13 is opened.
The difference is that the cutout step portion 19 is formed into a dogleg shape so that the direction in which the runout displacement is allowed is diagonally upward. Therefore, this embodiment is applied to a sewing machine in which the threading needle is linear and enters and exits obliquely upward relative to the surface of the tatami body.

Next, in the embodiment of the guide member shown in FIG. 6, a pair of block materials 30 and 31 are arranged opposite to each other on the left and right, and recesses 32 and 33 are provided on the opposing surfaces of the blocks, and a space between the lower parts of the recesses is provided. A guide hole 13 for the hook needle 5 is formed in the shape of a groove with an upwardly facing side opening on the lower side of the step. and double concave recess 3
A plate-shaped cover member 34 that can be moved left and right between 2 and 33 is installed, and the cover member 34 is engaged with a slider 35 to control the left and right movement. As a result, when the cover member 34 is on the side of the concave portion 32 forming the guide hole 13, its lower end surface covers the side opening toward the upper side of the guide hole 13, as shown by the imaginary line. cover member 3
4 is moved to the other concave portion 33, the upper side opening of the guide hole 13 is opened. Note that the cover member 34
is elastically biased toward the concave portion 32 forming the guide hole 13 by, for example, a return spring (not shown) so as to adapt to the movement of the slider 35. In this embodiment, the guide hole 13 has a side opening towards the upper side, and the hooking needle 5 can be opened by opening the side opening.
Since the permissible direction of runout displacement is vertically upward, it is applicable to sewing machines in which the threading needle is curved (arc-shaped) and enters and exits in an arc-shape from the surface of the tatami mat. Ru.

As described above, the present invention is extremely effective in preventing abrasion, breakage, and fatigue of the hook needle and making the hooking operation of the sewing thread smooth and accurate without mis-scatch. This is an excellent idea that can solve the pending problems.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the outline of the main parts of a conventional tatami edge sewing machine, Fig. 2 is a side view of the tip of the threading needle, and A, B, and C in Fig. 3 are respectively A plan view showing an outline of the main parts of the embodiment of the sewing machine according to the present invention according to the operating order of the crochet needle, and FIGS. 4A and 4B are front views of an embodiment of the crochet needle guide member according to the present invention; A cross-sectional view, FIG. 5 is a cutaway rear view of another embodiment of the guide member, and FIG. 6 is a cutaway rear view of still another embodiment of the guide member. 1... Threading hole, 2... Recess, 3... Threading needle, 4... Hook portion, 5... Hook needle, 6... Sewing thread, 7...
...Tatami body, 7a...Tatami body side edge, 8...Gap, 9...
...Supporting member, 12...Guiding member, 13...Guiding hole, 18, 34...Cover member.

Claims (1)

[Claims for Utility Model Registration] A straight or curved threading needle having a threading hole drilled near the tip and a recess cut out near one of the holes, and a thread hook near the tip. The threading needle has a linear thread pulling hook formed with a thread hole, and the threading needle enters into the tatami body from the back surface of the tatami body while stretching the sewing thread passed through the threading hole over the recess, and at the same time The tip of the thread pulling hook that has entered the tatami body from the side edge of the tatami body rubs its side surface against the recess and enters the gap between the recess and the stretched sewing thread, and the hook of the hook After passing through the gap, the threading needle and the hook needle each exit out of the tatami body, so that the hook portion of the hook hooks the sewing thread threaded through the threading needle and pulls it out to the side edge of the tatami body. In the tatami edge sewing machine, the hook needle enters the tatami body from the side edge of the tatami body through a guide hole provided in a guide member applied to the side edge of the tatami body, The guide hole is formed in the shape of a groove having a side opening that allows deflection of the crochet needle toward the side opposite to the contact surface of the tip side surface of the crochet needle to the concave portion of the threading needle. A cover member is provided which is movable between a state position where the side opening of the guide hole is covered so as to prevent the movement of the hook, and a state position where the side opening of the guide hole is opened so as to allow deflection of the hook. A tatami mat edge sewing machine characterized by being provided with a mechanism for moving a cover member.