JPH0321196B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a multi-needle sewing device equipped with a large number of sewing machine needles lined up in the width direction. This allows objects to be sewn whose thickness easily changes to be sewn to a desired thickness.

(Prior art) A large number of sewing machine needles are attached downward to a widthwise long needle stand that is supported so as to be able to rise and fall freely. A multi-needle sewing device that performs chain stitching is known (for example, Japanese Patent Publication No. 44-8715,
53-42978, Utility Model Publication No. 61-852, etc.).
As described in Japanese Patent Publication No. 53-42978, the above-mentioned needle rest is operated by rotating a crankshaft that is provided vertically below the needle rest and parallel to the needle rest. It was normal to raise and lower the vehicle via a In addition, in the single chain stitch method, a looper is provided below the object to be sewn, facing the sewing machine needle, and the sewing thread pulled out from the upper bobbin is passed through the needle hole of the sewing machine needle, stuck into the object to be sewn, and then raised. The tip of the looper is hooked onto the sewing thread loop that is formed at the time of sewing to create a sewing thread loop on the underside of the object being sewn (see Japanese Patent Publication No. 1987-8715). The sewing thread pulled out from the lower bobbin is hooked onto the hook of the sewing machine needle that pierces the kimono from above and protrudes below the object to be sewn, using the above-mentioned thread hook to pull out the sewing thread loop upward (Special Publication Act 1973- 42978 and Utility Model Publication No. 61-852) are known.

(Problems to be Solved by the Invention) When sewing with the above-mentioned single chain stitch type multi-needle sewing device, sewing is performed so that the thickness t of the object to be sewn and the stitch pitch p are approximately equal, and the sewing machine When there is a relationship p<a<2p between the height a of the top dead center of the needle (distance between the top surface of the object to be sewn and the needle hole) and the stitch pitch p,
Sewing work can be performed smoothly and good seams can be obtained. Therefore, the thickness range of objects to be sewn that can be sewn with a constant vertical stroke of the sewing machine needle is extremely narrow, and is limited to twice the thickness. Moreover, conventionally,
The object to be sewn was placed on a fixed guide plate and simply supported from below, or the object to be sewn on the guide plate was simply pressed elastically with a top pressing plate, so cushioning materials, pine tresses, etc. When sewing flexible and thick objects whose thickness easily changes with pressure, such as filter materials, or two pieces of fabric separated vertically by a certain distance, it is extremely difficult to adjust the amount of tightening. It was difficult.

It is known that multiple pin holes are drilled along the length of the crank and the connecting pins are replaced depending on the thickness of the material to be sewn to change the vertical stroke of the sewing machine needle. In order to keep the height of the bottom dead center of the sewing machine needle unchanged, it is necessary to adjust the length of the connecting rod at the same time as replacing the connecting pin, and furthermore, adjusting the stroke alone is not enough to tighten the flexible workpiece mentioned above. It was not possible to adjust the amount sufficiently.

The present invention provides a multi-needle sewing device that can sew objects whose thickness easily changes depending on pressure to a desired thickness.

(Means for Solving the Problems) In order to achieve the above object, in the multi-needle sewing device of the present invention, the object to be sewn is placed above a fixed guide plate that supports and guides the object to be sewn from below. A top guide plate in contact with the top surface is provided so that its height can be adjusted freely, and a horizontally movable table whose height can be adjusted in the longitudinal direction is provided below the fixed guide plate. A pair of left and right rocking levers are provided which are driven to swing up and down between the tilted position at an angle of , coupled so as to be slidable along a guide provided along the length of the swing lever.

An upper sheet guide plate is fixed below the upper guide plate with a gap through which an upper sheet such as a cloth can pass, and a lower sheet guide plate is placed above the fixed guide plate with a gap through which the lower sheet can pass. can be fixed.

Furthermore, the top guide plate can be raised and lowered in conjunction with the back and forth movement of the horizontal movement table, and the height of the top guide plate can be increased in accordance with the increase in the height of the needle rest as the horizontal movement table moves back and forth.

Further, the horizontal moving table may be moved manually to adjust its forward and backward position, but it can be reciprocated back and forth at a predetermined period.

Furthermore, the object to be sewn can be advanced intermittently in synchronization with the vertical movement of the sewing machine needle, as in a normal multi-needle sewing device, but the object to be sewn can be advanced continuously, The sewing machine needle may be moved back and forth while being raised and lowered.

Note that the horizontal position of the swing lever does not require that the swing lever be strictly horizontal at the lowest point of its swing range; it may be slightly inclined; for example, the swing lever may be at the lowest point of its swing range. When the lower point is reached, the position may be approximately 5 degrees below the horizontal line.

(Function) When the swing lever swings up and down between the horizontal position and the inclined position, the needle rest swings up and down via the vertical rod, and when the swing lever is in the inclined position, the needle rest moves up and down in the stroke. When the swing lever is in the horizontal position, the needle rest is located at the lower end of the stroke. When the position of the horizontal moving base moves back and forth, the vertical stroke of the needle rest changes. however,
When the swing lever is in the horizontal position, the needle rest is located at the lower end of the stroke, so as the stroke changes, only the upper end position of the stroke changes, and the lower end position does not change. Note that if the swing lever drive mechanism is set so that when the swing lever reaches the lowest point of its stroke, it will be approximately 5 degrees below the horizontal line, then the swing lever will move approximately 5 degrees below the horizontal line. When the temperature rises and the swing lever is accurately horizontal, hook the sewing thread loop at the lower end of the sewing machine needle to the looper,
The sewing thread can be hooked onto the hook of the sewing machine needle, and these hooking operations are facilitated.

On the other hand, by fixing the top guide plate at a predetermined height, the thickness of flexible thick objects such as mats filled with cotton or soft resin foam can be controlled to the height of the top guide plate. be done. Therefore, by setting the longitudinal position of the horizontal moving table and determining the vertical stroke of the sewing machine needle according to this height, a stitch that matches the height of the upper guide plate is formed, and is flexible and The degree of tightening of thick objects to be sewn is adjusted.

In this case, the upper sheet guide plate is fixed below the upper guide plate, the lower sheet guide plate is fixed above the fixed guide plate, the upper sheet is fixed above the upper sheet guide plate, and the lower sheet guide plate is fixed below the lower sheet guide plate. When sewing through the lower sheet, the length of the sewing thread spanning the upper and lower sheets is controlled by the distance between the upper and lower sheet guide plates, and the upper and lower 2
The sheets are sewn together with the above distance apart, resulting in a bag that does not bulge beyond the above distance.

In addition, when the upper guide plate is moved up and down in conjunction with the back and forth movement of the horizontal moving table, the height of the upper guide plate is adjusted in conjunction with the up and down stroke of the sewing machine needle.
The vertical stroke of the sewing machine needle always matches the height of the upper guide plate.

Further, when the horizontal moving table is moved back and forth at a constant cycle, the vertical stroke of the sewing machine needle increases and decreases at a constant cycle, resulting in a sewn product whose thickness changes in a chevron shape.

In addition, if the material to be sewn is continuously fed forward and the sewing machine needle moves up and down and back and forth, problems caused by inertia when the material to be sewn is particularly heavy can be reduced, and the stitches can be sewn at a constant speed. Since the adhesive moves continuously, the adhesive is applied uniformly to the seams.

(Example) In FIG. 1, rails 2 in the front and back direction (the left side of the figure is the rear) are fixed on the front, back, left and right sides of a rectangular base 1 fixed on the floor F.
A rectangular horizontal moving table 3 is placed on the top, and legs 3a are placed on the bottom of the table.
It can be slid forward and backward. A threaded portion 6a at the front of a screw shaft 6 supported by a bearing fitting 5a is screwed into a nut 4 fixed to the center of the horizontal moving table 3, and a hand crank is attached to the rear end of the screw shaft 6. 6b is fixed, and by turning this manual handle 6b, the horizontal moving table 3 moves back and forth and stops at a desired position.

The rear end of a longitudinally long swinging lever 8 is connected to brackets 7 fixed on the left and right sides of the rear end of the horizontal moving table 3 by a pin 7a so as to be able to swing up and down. This swing lever 8 has a guide groove 8a formed along its length.
A swing pin 10 attached to the lifting block 9 is slidably fitted therein. The lifting block 9 is mounted on a vertical guide 11 erected at the left and right center portions of the fixed base 1 so as to be vertically slidable. Further, a tip pin 13b of a crank 13, which is driven by a motor 12 and rotates counterclockwise, is slidably fitted into the tip side of the guide groove 8a. 8 is adapted to swing up and down between a horizontal position and an inclined position as shown. In addition, 12a is a motor sprocket, 14 is a transmission chain, 13a is a crank sprocket, and 15 is a crank stand.

An upper needle rest 17 connected to the above-mentioned lifting block 9 by a vertical rod 16 is formed long in the width direction, is supported by a side frame (not shown) so as to be vertically slidable, and is attached to the lower surface of the side frame (not shown). Metal fittings 1
A large number of chain stitch sewing machine needles 19 are fixed downward by 8. Then, the sewing machine needle 19
A thread hook 20 for chain stitching is provided below, and this thread hook 20 fits into a spline shaft 21 and is driven by a cam 22 rotating together with the spline shaft 21, so that when the sewing machine needle 19 is lowered, The sewing thread Y is attached to the hook at the end. The cam 22 is supported on the main body frame, and the spline shaft 21 is supported on the horizontal moving table 3, and is rotated in synchronization with the vertical movement of the sewing machine needle 19 by transmission from the motor 12 below. do.

A fixed guide plate 31 for placing and guiding the article to be sewn S is provided above the thread hook 20, and an upper guide plate 34 that can be raised and lowered is provided above the fixed guide plate 31. The fixed guide plate 31 and the upper guide plate 34 have needle holes 31a and 34a, respectively, through which the sewing machine needle 19 can pass. The fixed guide plate 31 is fixed at a predetermined position on a frame (not shown), but the upper guide plate 31 is provided in a height adjustable manner. That is, the vertical part 36a of the L-shaped elevating frame 36 is attached to the rear upper vertical guide rail 35 via the sliding block 37 so as to be vertically slidable, and the leg part 36c is attached to the lower surface of the horizontal part 36b of the L-shaped elevating frame 36. The upper guide plate 34 is fixed thereto. The left and right L-shaped frames 36 are connected together by a widthwise beam 36d, and the threaded portion of the vertical screw shaft 40 is screwed into a nut 38 fixed to the widthwise center of the upper beam 36d. Hand crank 4 fixed at the top end
By rotating 0a, the height of the upper guide plate 34 is adjusted via the L-shaped vertical frame 36.

In the above structure, the sewing thread Y pulled out from the sewing thread cheese Ya is transferred to the thread hook 20, the needle hole 31a of the fixed guide plate 31, and the needle hole 34a of the upper guide plate 34.
When the workpiece S is put on the hook of the upper sewing machine needle 19 through the sewing machine needle 19 and the machine is operated with the workpiece S placed on the fixed guide plate 31, the workpiece S is intermittently fed forward at a predetermined pitch, and at the same time, The sewing machine needle 19 is connected to the motor 12
The sewing machine is driven by the sewing machine and moves up and down, and multiple rows of chain stitches are performed on the sewing object S. When the handle 6a of the screw shaft 6 is turned, the horizontal moving table 3 moves back and forth, the distance between the fulcrum 7a of the swing lever 8 and the vertical guide 11 changes, and the lifting block 9
The vertical stroke of the vertical axis changes, and the upper end position of the vertical stroke changes. That is, the sewing machine needle 19
The vertical stroke and the position of the upper end change. However, the lower end position of the vertical stroke does not change. Therefore, while the swing lever 8 is in the inclined position and the sewing machine needle 19 is at the upper end of the vertical stroke, the lower handle 6b is turned to lower the sewing machine needle 1.
9 while adjusting the height of the upper L-shaped frame 36 and setting the height of the upper surface guide plate 31 to a height corresponding to the vertical stroke of the sewing machine needle 19. It is possible to sew a flexible object S, such as a cushion filled with rubber, to a desired thickness and in an appropriately tightened state.

In the embodiment shown in FIG. 2, the lower sheet guide plate 32 is supported above the fixed guide plate 31 by a pair of right and left supports (not shown), and the lower sheet guide plate 32 is supported by a pair of left and right supports (not shown) below the upper guide plate 34. (not shown), the lower sheet B is fixed between the fixed guide plate 31 and the lower sheet guide plate 32, and between the upper guide plate 34 and the upper sheet guide plate 33. The upper sheet A is inserted into each case, and the upper sheet A and the lower sheet B are sewn together in a vertically separated state. Note that the upper sheet guide plate 33 and the lower sheet guide plate 32 have long needle holes 33a and 32a with open front ends, respectively, so that the upper and lower sheets A and B can be connected to each other.
This allows the suture Y to escape across the

In the embodiment shown in FIG. 3, the horizontal movable table 3 is reciprocated back and forth at a predetermined period, and the L-shaped lifting frame 36 is reciprocated up and down in synchronization with this.
That is, the screw shaft 6 for moving the horizontal movement table 3 back and forth is driven by the horizontal movement motor 5,
The horizontal movement table 3 is rotated by the forward and reverse rotation of the motor 5.
The sewing machine needle 19 reciprocates back and forth at a constant cycle, and the vertical stroke of the sewing machine needle 19 repeats a gradual decrease and a gradual increase. On the other hand, a vertical screw shaft 40 for raising and lowering the L-shaped lifting frame 36 upward is driven by a height adjustment motor 39, and its forward and reverse rotation moves the L-shaped lifting frame 36 up and down, and the sewing machine needle 1
The height of the upper surface guide plate 34 changes in accordance with the change in height of the upper end of the vertical stroke of No. 9, that is, the top dead center. Note that an upper sheet guide plate 32 is fixed above the fixed guide plate 31, and an upper sheet guide plate 33 is fixed below the upper guide plate 34.

Thus, in this embodiment, the upper sheet A and the lower sheet B are continuously fed forward, and the sewing machine needle 19 reciprocates back and forth. That is, the upper frame 24, which supports the needle rest 17 which is long in the width direction so as to be slidable up and down, rides on the front and rear upper rails 23, 23 fixed on the main body frame via the leg portions 24a, so as to be slidable back and forth. It is biased backward by a tension coil spring 25 attached to the rear surface, so that it can retreat until it touches a stopper 26. On the other hand, a chain 27 extending forward is connected to the front surface of the upper frame 24, and the front end of this chain 27 is fixed to a feed chain sprocket 28.
A driving sprocket 2 which is provided coaxially with the motor and which is attached and detached by an electromagnetic clutch (not shown).
9 is driven via a transmission chain 30 from a winding device for sheets A and B located in front, and continuously rotates clockwise at a constant speed. Therefore, when the driving sprocket 29 and the feeding chain sprocket 28 are connected by an electromagnetic clutch, the upper frame 24 advances at a speed equal to the winding speed of the upper sheet A and the lower sheet B, and the above-mentioned When the connection is broken, the tension coil spring 2
It retreats due to the elasticity of 5. Note that the spline shaft 21 moves back and forth together with the horizontal moving table 3, and the thread hook 20 and cam 22 move back and forth together with the upper frame 24 and needle rest 17.

In the embodiment shown in FIG. 3, the horizontal movement motor 5
The horizontal moving table 3 reciprocates back and forth by the forward and reverse rotation of the rocking lever 8.
swings up and down, and the upper guide plate 34 changes its height by the forward/reverse rotation of the upper height adjustment motor 39, and the rotation of the front winding device and the sprocket 28,
By intermittent operation of the electromagnetic clutch 29, the upper frame 24 reciprocates back and forth over a distance corresponding to a vertical pitch to stitch the upper sheet A and the lower sheet B together. Then, while the swinging lever 8 is repeatedly rocked up and down, the horizontal moving table 3 gradually moves back and forth, thereby changing the vertical stroke of the needle rest 17, and at the same time changing the height of the top guide plate 34. ,
The interval between the upper and lower sheet guide plates 32, 33 is narrowed or widened, and the upper and lower sheets A, B are sewn together in the shape shown in FIG. 3. Therefore, by cutting the sheets A and B shown in FIG. 3 at their tops and troughs, respectively, to form a wedge-shaped sutured body in the shape shown in FIG. 4, and then sewing both ends to form a bag, A wedge-shaped bag filter that does not lose its wedge shape due to internal pressure can be obtained.

In the above embodiment, when a looper is used instead of the thread hook 20 and the sewing thread Y is supplied from above, another driving source can be used instead of the spline shaft 21. Further, even when using the thread hook 20 described above, the spline shaft 21 can be omitted and the cam 22 can be driven using a drive source other than the motor 12. Further, as the drive means for the swing lever 8, any mechanism such as a cam may be used in place of the illustrated crank 13 as long as it is substantially horizontal at its lowest end position.

(Effect of the invention) The invention as claimed in claim 1 changes the setting of the lifting stroke by changing the upper end height of the sewing machine needle without changing the lower end height of the lifting stroke of the sewing machine needle by adjusting the longitudinal position of the horizontal moving table. Since the height of the upper guide plate in contact with the upper surface of the object to be sewn can be changed arbitrarily according to the above-mentioned lifting stroke, it is possible to adjust the thickness of flexible objects such as foam rubber or cotton-filled mat to the desired thickness. Moreover, it is possible to sew with the desired tightness. Further, according to the invention described in claim 2, 2
The sheets can be sewn together at desired intervals. Further, according to the third aspect of the present invention, the height of the upper guide plate and the vertical stroke of the sewing machine needle can be adjusted in conjunction with each other. Further, according to the invention described in claim 4, the vertical stroke of the sewing machine needle is continuously increased and decreased, so that the cross section can be formed into a continuous mountain shape, and the upper and lower sheets are sewn together to form a wedge-shaped cross section. You can make bags of Furthermore, according to the invention set forth in claim 5, the object to be sewn can be continuously fed forward and the sewing machine needle can be reciprocated back and forth.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the first embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of the main part of the second embodiment, Fig. 3 is a longitudinal cross-sectional view of the third embodiment, and Fig. 4 is the above-described longitudinal cross-sectional view. FIG. 3 is a longitudinal cross-sectional view of the upper sheet and lower sheet sewn by the apparatus shown in FIG. 3, and FIG. 5 is a perspective view of a portion of FIG. 4. 1: Fixed base, 3: Horizontal moving table, 8: Swing lever, 8a: Guide groove, 11: Vertical guide, 1
6: Vertical rod, 17: Needle rest, 19: Sewing machine needle,
20: thread guide, 24: upper frame, 31: fixed guide plate, 32: lower sheet guide plate, 33: upper sheet guide plate, 34: upper surface guide plate, S: object to be sewn, A: upper sheet (object to be sewn) ), B: Lower sheet (material to be sewn), Y: Sewing thread.

Claims (1)

[Scope of Claims] 1. A needle base in which a large number of sewing machine needles are fixed with their tips facing downward is provided so as to be able to move up and down, and multiple rows of single chain stitches can be performed on a material to be sewn which is fed horizontally below the needle stand. In the multi-needle sewing device, a height-adjustable upper guide plate that contacts the upper surface of the object to be sewn is provided above a fixed guide plate that supports and guides the object to be sewn from below; A horizontally movable table whose position in the front and back direction can be adjusted is provided below the plate, and on this horizontally movable table there is a device that is driven to swing vertically between a horizontal position and an inclined position inclined at a predetermined angle with respect to the horizontal position. A pair of left and right swinging levers are provided, which guide the lower ends of the vertical rods connected to both ends of the needle base so that they can move up and down vertically, and guide the needles along guides provided along the length of the swinging levers. A multi-needle sewing device characterized by being connected so as to be able to slide together. 2. A claim in which an upper sheet guide plate is fixed below the upper guide plate with a gap through which the upper sheet can pass, and a lower sheet guide plate is fixed above the fixed guide plate with a gap through which the lower sheet can pass. The multi-needle suturing device according to item 1. 3. Claim 1 or 2, wherein the top guide plate moves up and down in conjunction with the back and forth movement of the horizontal movement table, and the height of the top guide plate increases in accordance with the increase in the height of the needle rest as the horizontal movement table moves back and forth. The described multi-needle suturing device. 4. The multi-needle sewing device according to claim 3, wherein the horizontally movable table reciprocates back and forth at a predetermined period. 5. The multi-needle sewing device according to claim 1, wherein the object to be sewn is continuously fed at a constant speed, and the sewing machine needle reciprocates back and forth while moving up and down.