JP4686744B2 - Portable flat stitch machine - Google Patents

Description

  The present invention is a flat needle sewing machine used for sewing tatami mats, in particular, a tatami mat that can be miniaturized and has a notch or a U-shaped notch for avoiding a protruding tatami with a key, that is, a pillar, etc. The present invention relates to a portable flat needle sewing machine that is suitable for flat stitching a hem (helicity) on the edge of a cutout portion.

Conventionally, a flat stitch sewing machine in which the work of flat stitching a margin fabric on the edge of a tatami is mechanized is known (see, for example, Patent Documents 1 and 2). However, in the case of a tatami with a key that has been cut out in a U-shape or U-shape to avoid the protrusion of a pillar or the like in a conventional flat-needle sewing machine, the cut-out portion is a corner of the notch in a conventional flat-needle sewing machine. Until the needle does not reach. In addition, the keyed tatami may eventually finish the notch on the site, and in such a case, the conventional flat sewing machine cannot be used easily because it cannot be carried easily. For this reason, conventionally, the flat stitch stitching of the notch portion of the tatami with lock is performed by hand stitching.
Japanese Utility Model Publication No. 60-60 JP-A-1-27760

  As described above, the flat stitch stitching of the notch portion of the lockable tatami mat has not been mechanized and has been forced to perform extremely inefficient work. Also, hand-sewing required skill and there was a problem with the stability of quality.

  An object of the present invention is to solve such a problem, and an object of the present invention is to provide a portable flat needle sewing machine that can be miniaturized and is suitable for flat stitch sewing of a notch portion of a lockable tatami mat.

  The portable flat sewing machine of the invention according to claim 1 is a flat sewing machine that sewes a hem and a margin paper on a tatami floor that has been sewed and fixed by tensioning the tatami surface, and is an upper surface of the tatami mat. An upper frame having an upper presser for pressing and a lower frame having a lower table for supporting the lower surface of the tatami mat. The upper frame has a needle and a needle holding operation mechanism for flat stitching, and further, the needle holding operation. A sewing machine feed mechanism interlocking with the mechanism and a drive mechanism for driving all of them; a thread supply mechanism for supplying a thread for sewing to the lower frame; and flat stitch sewing of the thread for sewing A member for connecting to the upper frame and the lower frame is provided at least on the back side of the flat needle sewing machine. Between the lower tables, it is composed of only a thin plate-like member in the traveling direction of the sewing machine, and a member for drivingly connecting the threading mechanism to the driving mechanism is installed therein, and the upper presser and the lower table are connected to each other. It is characterized in that the interval can be arbitrarily adjusted.

  The portable flat stab sewing machine of the invention according to claim 2 is the portable flat stab sewing machine according to claim 1, characterized in that the sewing method is single-ring sewing.

  The portable flat bar sewing machine of the invention according to claim 3 can be equipped with a rack type ruler with a claw for feeding the sewing machine in the sewing direction in the portable flat bar sewing machine according to claim 1 or 2. It is characterized in that the setting position of the ruler can be changed by temporarily stopping the sewing operation of the sewing machine during the sewing operation.

  A portable flat bar sewing machine according to a fourth aspect of the present invention is the portable flat bar sewing machine according to the first aspect, wherein the needle holding operation mechanism engages horizontally with a pin on the front side of the cam plate so as to move horizontally. The guide groove is characterized in that a central portion is recessed upward so as to stably hold the needle in the raised position.

  The portable flat bar sewing machine of the invention according to claim 5 includes upper pressers that are substantially parallel to each other and have holes through which needles pass at positions that are opposed to each other vertically and overlap each other in the vertical direction with an interval between the edges of the tatami mat. A lower table, an upper frame that holds the upper presser, a lower frame that holds the lower table, and the upper frame and the lower frame are connected to each other on the back side so that the gap between the upper presser and the lower table can be adjusted. An upper and lower frame connecting mechanism, a cam plate having a substantially disc shape and having a cam surface on the outer periphery and having a pin on the front side and rotatably supported by the upper frame above the upper presser, and rotating the cam plate A driving mechanism for driving, a needle for flat sew stitching having a key portion at the front end in front of the cam plate, is held substantially vertically and cooperates with a pin on the front side of the cam plate to rotate the cam plate. The lower table in cooperation with a needle holding operation mechanism for operating the needle up and down in conjunction with the sewing machine, a thread supply mechanism for supplying a sewing thread below the lower table, and a cam surface on the outer periphery of the cam plate. The sewing machine body is sewn in the sewing direction after the needle is raised in cooperation with the thread hooking mechanism for hooking the thread supplied by the thread feeding mechanism to the key part at the tip of the needle lowered downward and the pin on the front side of the cam plate. The sewing machine is provided with a sewing machine feed mechanism for moving the needle by one stitch.

  In the portable flat sewing machine according to the fifth aspect of the present invention, the upper and lower frame connecting mechanism is further fixed to the center of the back portion of the lower frame with one short side of the flat rectangular shape facing the front. A back plate extending substantially vertically upward, and a variable connecting device for connecting the upper frame to the upper portion of the back plate so that the height of the upper frame can be adjusted, and the yarn hooking mechanism is provided below the lower table. It fits in a horizontal swivel thread hook that pushes the thread into the key at the tip of the needle, a vertically swinging cam follower that contacts the cam surface on the outer periphery of the cam plate, and a vertically elongated hole provided in the back plate. A shaft extending from a back portion of the upper frame to a back portion of the lower frame, and an upper link device that connects the cam follower and the shaft and converts a vertically swinging motion of the cam follower into a rotational motion of the shaft; And a lower link device that connects the shaft and the thread hook and converts the rotational movement of the shaft into a horizontal swiveling movement of the thread hook, at a height below the upper presser and above the lower table. In the horizontal cross section, only the back plate and the shaft that fits in the hole in the back plate appear.

  This portable flat needle sewing machine is set so that the tatami is sandwiched between the upper presser and the lower table in accordance with the needle position at the start of sewing on the side of the tatami mat covered with the edge cloth, with the needle raised. And adjust the gap between the table and the lower table to the thickness of tatami mat.

  At this time, the needle holding operation mechanism includes a guide plate having a horizontally long guide groove that is movably engaged with a pin on the front surface of the cam plate, and the central portion of the guide groove stably holds the needle at the raised position. When the central portion is recessed upward, the needle is stably held at the raised position, and it is possible to prevent the feeding operation from being lowered carelessly.

  Then, the cam plate is rotated. When the cam plate is rotated in this way, the needle holding operation mechanism cooperates with the pin on the front side of the cam plate, the needle is lowered, passes through the lower presser paper, the edge cloth and the tatami through the hole of the upper presser foot, and the needle tip is It goes down further down through the hole in the lower table. Then, when the needle tip is lowered, a thread hooking mechanism that cooperates with the cam surface on the outer periphery of the cam plate is operated to hook the thread on the key portion at the tip of the needle.

  In this state, the sewing machine feed mechanism is set to the initial operation state. When the cam plate is further rotated, the needle rises to lift the thread, and then the sewing machine feed mechanism that cooperates with the pin on the front side of the cam plate is activated to move the apparatus main body by one stitch in the sewing direction. .

  Thus, every time the cam plate makes one round, flat stitches are advanced by one stitch. By repeating this operation, flat stitches on the tatami side can be performed as long as necessary.

  And this portable flat bar sewing machine is a structure in which only the shaft that fits in the back plate and the hole in the back plate appears in the horizontal section at the height below the upper press and above the lower table, Even when performing flat sew at the notch of the tatami with key, the needle reaches near the corner of the notch, and stable flat sew by mechanization can be performed.

  And this portable flat bar sewing machine has a simple configuration and can be miniaturized.

  As is clear from the above description, according to the present invention, flat stitching of the notch portion of the lockable tatami mat can be mechanized.

  1 to 8 show an example of an embodiment of the present invention. 1 is a front view of a portable flat bar sewing machine, FIG. 2 is a side view of the portable flat bar sewing machine, FIG. 3 is a perspective view showing a schematic configuration of the portable flat bar sewing machine, and FIG. FIG. 5 is a front view explanatory view (a) of the upper and lower parts of the sewing machine schematically illustrating the state where the needle is raised, and FIG. 6 is a plan view explanatory view (b) of the lower part of the sewing machine, and FIG. 6 is a schematic view of the state where the needle is lowered. FIG. 7 is a front view explanatory diagram of the upper and lower parts of the sewing machine, and FIG. 7B is a plan view of the lower part of the sewing machine. FIG. View explanatory drawing (a), plane view explanatory view (b) of the lower part of the sewing machine, and FIG. 8 are action explanatory views of flat stitching by the portable flat needle sewing machine of this embodiment.

  As shown in FIGS. 1 to 3, the portable flat-tear sewing machine (M) of this embodiment is positioned so as to be opposed to each other in the vertical direction with an interval between the edges of the tatami mat (T) and overlapped when viewed in the vertical direction. It has an upper presser 3 and a lower table 4 which are substantially parallel to each other and have holes 1 and 2 through which needles pass. The hole 1 of the upper presser 3 has a circular cross section. Moreover, the hole 2 of the lower table 4 is used for allowing the needle to pass therethrough and for discharging the thread from the bottom of the lower table 4 as will be described later, and the cross-sectional shape is a hole elongated in the sewing direction.

  The upper presser 3 is fixedly held at the lower end of the upper frame 5, and the lower table 4 is fixedly held at the upper end of the lower frame 6. The upper frame 5 and the lower frame 6 are connected to each other on the back side so that the gap between the upper presser 3 and the lower table 4 can be adjusted by the upper and lower frame connecting mechanism (A).

  The upper and lower frame coupling mechanism (A) is a thin (for example, 6 mm thick) flat plate, and is fixed to the center of the back portion of the lower frame 6 with one short side of the substantially rectangular cross section facing the front, and extends substantially vertically upward. The upper frame 5 is connected to the upper part of 11 via a screw-type variable connecting device 12, and the height of the upper frame 5 can be freely adjusted by operating the thickness adjusting handle 13.

  Above the upper presser 3, a cam plate 23 having a substantially disc shape and having a cam surface 21 on the outer periphery and a pin 22 on the front side is rotatably supported on the upper frame 5 via a cam shaft 24. . An internal gear 25 is fixed to the back surface of the cam plate 23, and a drive handle 26 is disposed behind the upper frame 5. The rotation of the handle 26 is from a pinion (not shown) fixed to the handle shaft. A drive mechanism is configured such that the cam plate 23 is rotationally driven by being transmitted to the internal gear 25.

  In front of the front of the cam plate 23, a needle 32 for flat sew stitching having a threaded key portion 31 at the tip is held substantially vertically, and the cam plate 23 cooperates with a pin 22 on the front side of the cam plate 23. Is provided with a needle holding and operating mechanism (B) that operates the needle 32 up and down in conjunction with the rotation of the needle 32.

  The needle holding / operating mechanism (B) has a pair of left and right guides on the front side of a guide plate 34 having a horizontally elongated guide groove 33 that is horizontally engaged with a pin 22 on the front side of the cam plate 23 and whose center portion is recessed upward. The linear bushes 35A and 35B are fixed, the holder 36 holding the needle 32 is fixed at the center of the front, and the left and right linear bushings 35A and 35B are slidable vertically on the linear shafts 37A and 37B supported by the upper frame 5. It is inserted in

  Below the lower table 4, a thread supply mechanism (C) for supplying a thread for sewing is provided. The thread supply mechanism (C) is provided on a thread reel 41 attached to one side outward of the lower frame 6, a thread tension 42 on the feeding side that sandwiches the thread pulled out from the thread reel 41, and a side plate of the lower frame 5. After the leading end of the yarn led into the lower frame 6 from the yarn path 43 through the thread tension 43 on the feeding side and the thread tension 42 on the feeding side, the upper side is taken out from the hole 2 of the lower table 4 and then the opposite side of the lower frame 6 It is composed of a thread holding 44 on the front end side that is held outside.

  The portable flat sewing machine (M) is supplied by the thread supply mechanism (C) to the key 31 at the tip of the needle that has been lowered below the lower table 4 in cooperation with the cam surface 21 on the outer periphery of the cam plate 23. A yarn hooking mechanism (D) for hooking the thread that has been cut.

  The thread hooking mechanism (D) is a horizontal swing type thread hook 51 that pushes the thread into the key 31 at the tip of the needle below the lower table 4 and a vertically swinging type that contacts the cam surface 21 on the outer periphery of the cam plate 23. A cam follower 52, a shaft 54 that extends from the back of the upper frame 5 to the back of the lower frame 6, and is connected to the cam follower 52 and the shaft 54. An upper link device 55 that converts the vertical swing motion of the shaft 54 into the rotational motion of the shaft, and a lower link device 56 that connects the shaft 54 and the thread hook 51 and converts the rotational motion of the shaft 54 into the horizontal swing motion of the thread hook 51; It consists of The operation is indicated by arrows in FIG.

  In addition, the portable flat sewing machine (M) cooperates with the pin 22 on the front side of the cam plate 23 to move the main body of the apparatus (the upper frame 5 and the lower frame 6) in the sewing direction after the needle 32 is raised. A sewing machine feed mechanism (E) for moving the needle is provided.

  The sewing machine feed mechanism (E) includes a ruler guide 61 fixed to the upper front portion of the upper presser 3, a claw lever 63 that can be engaged with a rack-type ruler 62 that is set to be pressed against the upper surface of the tatami by the ruler guide 61, The lever 64 that cooperates with the pin 22 on the front side of the cam plate 23, the lever 64 and the claw lever 63 are connected, and the needle 32 is lowered to the rack position (initial operation position) one needle ahead. The link device 65 that rotates the engaged claw lever 63 to operate in the direction opposite to the sewing direction when the needle is raised, and the link device 65 moves so that the claw lever 63 does not exceed the initial operation position. It consists of a stopper 66 that regulates.

  This portable flat bar sewing machine (M) has a shaft that fits in a back plate 11 and a hole 53 in the back plate 11 in a horizontal section at a height below the upper presser 3 and above the lower table 4. Only 54 appears.

  This portable flat stab sewing machine is used with the upper presser 3 and the lower table 4 in accordance with the needle position at the start of sewing on the side of the tatami (T) covered with the edge cloth (N) with the needle 32 raised. The tatami is set so as to sandwich the tatami, and the gap between the upper presser 3 and the lower table 4 is adjusted to approximately the thickness of the tatami (T). FIG. 5 shows the state of each part when the needle 32 is raised. At this time, the needle 32 is stably held at the raised position by the center portion recessed above the guide groove 33.

  Then, the cam plate 23 is rotated. When the cam plate 23 is thus rotated, the needle 32 is lowered as shown in FIG. Then, the thread hook 51 hooks the thread (S) on the key part 31 at the tip of the needle 32. In this state, the claw lever 63 of the sewing machine feed mechanism (E) is set to the initial operation state one stitch ahead.

  When the cam plate 23 is further rotated, as shown in FIG. 7, the needle 32 rises to lift the thread (S), and then the sewing machine feed mechanism cooperates with the front side pin 22 of the cam plate 23. (E) operates, and the apparatus main body moves by one stitch in the sewing direction.

  Thus, every time the cam plate makes one round, flat stitches are advanced by one stitch. By repeating this operation, flat stitches on the tatami side can be performed as long as necessary.

  As shown in FIG. 8, this portable flat-stitch sewing machine (M) has needles close to the corner (K) of the tatami (T) notch when performing flat-stitching of the notch of the tatami mat with lock. 32 arrives and can perform stable flat stitching by mechanization. The thickness of the back plate 11 is, for example, 6 mm. In this case, the needle 32 can be sewn until the remaining distance (h) to the corner (K) of the notch is about 3 mm.

  The ruler 62 can change the installation position by temporarily stopping the sewing operation in the middle of the sewing operation.If the notch is large and the sewing length is long, stop the handle 26 and stop the sewing machine. By stopping and moving the ruler, the required flat stitch can be performed.

1 is a front view of a portable flat bar sewing machine as an example of an embodiment of the present invention. 1 is a side view of a portable flat bar sewing machine as an example of an embodiment of the present invention. It is a perspective view which shows schematic structure of the portable flat-tear sewing machine of an example of embodiment of this invention. It is operation | movement explanatory drawing of the threading mechanism of the portable flat-tear sewing machine of an example of embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically illustrates a state in which a needle of a portable flat-tear sewing machine as an example of an embodiment of the present invention is raised, (a) is a front view explanatory view of the upper part and lower part of the sewing machine, and (b) is a lower part of the sewing machine. FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically illustrates a state in which a needle of a portable flat-tear sewing machine as an example of an embodiment of the present invention is lowered, (a) is a front view explanatory view of the upper part and lower part of the sewing machine, and (b) is a lower part of the sewing machine. FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically illustrates a state in which a needle of a portable flat-tear sewing machine according to an embodiment of the present invention lifts a thread, (a) is a front view explanatory view of the upper and lower parts of the sewing machine, and (b) is a sewing machine. FIG. It is operation | movement explanatory drawing of the flat stitch by the portable flat stitch sewing machine of an example of embodiment of this invention.

Explanation of symbols

1, 2 holes 3 Upper presser 4 Lower table 5 Upper frame 6 Lower frame
11 Backboard
12 Variable coupling device
13 Thickness adjustment handle
21 Cam surface
22 pin
23 Cam plate
24 camshaft
25 Internal gear
26 Handle
31 Key
32 needles
33 Guide groove
34 Guide plate
35A, 35B linear bush
36 holder
37A, 37B linear shaft
41 thread reel
42 Thread tension
44 Yarn retention
43 Yarn Path
51 Thread hook
52 Cam Follower
53 Hole
54 shaft
55 Upper link device
56 Lower link device
61 Ruler Guide
62 Ruler
63 Claw lever
64 lever
65 Link device
66 Stopper A Upper and lower frame coupling mechanism B Needle holding operation mechanism C Thread supply mechanism D Thread hooking mechanism E Sewing machine feed mechanism T Tatami M Portable flat stab sewing machine

Claims (5)

A flat stitch sewing machine that sew the hem cloth and the margin paper on the tatami floor where the tatami mat has been tensioned and fixed and the sew is completed.
An upper frame having an upper presser for pressing the upper surface of the tatami mat, and a lower frame having a lower table for supporting the lower surface of the tatami mat;
The upper frame includes a needle for flat sew and a needle holding operation mechanism, a sewing machine feed mechanism interlocked with the needle holding operation mechanism, and a drive mechanism for driving them all.
The lower frame includes a thread supply mechanism for supplying a thread for sewing, a thread hooking mechanism for guiding the needle for sewing to the needle for flat stitching and hooking the thread for sewing.
The member that connects the upper frame and the lower frame is composed of only a thin plate-like member in the traveling direction of the sewing machine at least between the upper presser and the lower table on the back side of the flat needle sewing machine. A member for drivingly connecting the yarn hooking mechanism to the drive mechanism,
A portable flat bar sewing machine characterized in that an interval between the upper presser and the lower table can be arbitrarily adjusted. The portable flat-tack sewing machine according to claim 1, wherein the sewing method is single-ring stitching. A rack ruler with a claw to feed the sewing machine in the sewing direction can be installed, and the setting position of the ruler can be changed by temporarily stopping the sewing operation during the sewing operation. The portable flat bar sewing machine according to claim 1 or 2, characterized in that: The needle holding operation mechanism includes a guide plate having a horizontally long guide groove that is movably engaged with a pin on the front side of the cam plate, and the guide groove stably holds the needle at the raised position. The portable flat stab sewing machine according to claim 1, wherein a central portion is recessed upward. An upper presser and a lower table that are substantially parallel to each other and have holes that allow the needles to pass in positions overlapping each other when viewed in the vertical direction with an interval between the edges of the tatami mat;
An upper frame for holding the upper presser and a lower frame for holding the lower table;
An upper and lower frame coupling mechanism for coupling the upper frame and the lower frame on the back side so as to adjust the gap between the upper presser and the lower table;
A cam plate that is substantially disc-shaped and has a cam surface on the outer periphery and a pin on the front side, and is rotatably supported by the upper frame above the upper presser;
A drive mechanism for rotating the cam plate;
A needle for flat stitching having a key portion at the front end in front of the cam plate is held substantially vertically and cooperates with a pin on the front side of the cam plate to move the needle up and down in conjunction with rotation of the cam plate. A needle holding actuation mechanism that is actuated by
A thread supply mechanism for supplying sewing threads below the lower table;
A thread hooking mechanism for hooking the thread supplied by the thread feeding mechanism to a key part at the tip of the needle that has been lowered below the lower table in cooperation with the cam surface on the outer periphery of the cam plate;
A portable flat stab sewing machine provided with a sewing machine feed mechanism that moves the apparatus main body by one stitch in the sewing direction after the needle is raised in cooperation with a pin on the front side of the cam plate,
The upper and lower frame coupling mechanism is a flat plate having a substantially rectangular cross section with one short side facing the front and fixed to the center of the back portion of the lower frame and extending substantially vertically upward; It consists of a variable connecting device that connects the upper frame so that the height can be adjusted,
The threading mechanism includes a horizontal swivel threading mechanism that pushes a thread into a key part at the tip of the needle below the lower table, a vertically swinging cam follower that abuts against a cam surface on the outer periphery of the cam plate, A shaft extending from a back portion of the upper frame to a back portion of the lower frame that fits in a vertically long hole provided in a back plate, and the cam follower and the shaft are connected to each other to vertically swing the cam follower. An upper link device that converts the rotational motion of the shaft, and a lower link device that connects the shaft and the thread hook and converts the rotational motion of the shaft into a horizontal pivoting motion of the thread hook,
The portable flat sewing machine characterized in that only the shaft that fits in the back plate and the hole in the back plate appears in a horizontal section at a height below the upper presser and above the lower table.

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