JPH01285289A - Multiple needle sewing device - Google Patents

Abstract

PURPOSE:To enable the sewn object of which thickness is changeable according to pressure, to be sewn in a desired thickness, by arranging a pair of left and right oscillating levers oscillating vertically with driving between a horizontal position on a horizontally moving base, and an inclined position at a specified angle inclined to the horizontal position. CONSTITUTION:When the handle 6a of a screw shaft 6 is turned, then a horizontally moving base 3 is moved to the front and rear, and a distance between the fulcrum 7a of an oscillating lever 8 and a vertical guide 11 is changed, and the elevating stroke of an elevating block 9 is changed, and the upper end position of the elevating stroke is changed. In other words, the elevating stroke of a sewing machine needle 19 and its upper end position are changed. However, the lower end position of the elevating stroke is not changed. In the meantime, by turning a manually operating handle 40a for an upper L-type frame 36 and by setting the level of an upper surface guide plate 31 to be a level according to the elevating stroke of the sewing needle 19, a flexible sewn object S like a cushion filled up with a foam rubber can be sewn in a desired thickness and in a properly fastened state.

Description

Detailed Description of the Invention (Industrial Field of Application) This invention relates to a multi-needle one-piece sewing machine equipped with a large number of sewing machine needles lined up in one 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 machine that uses chain stitching is known (for example,
-8715, Japanese Patent Publication No. 53-42978, Japanese 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 it via a In addition, as for the opening chain stitch method, a looper is provided below the object to be sewn opposite to 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 and stuck into the object to be sewn, and then raised. The tip of the looper is hooked to the sewing thread loop that is formed during the sewing process, and a sewing thread loop is displayed on the underside of the object to be sewn (Special Publication Publication No. 44-8
In place of the above-mentioned looper, the thread hook is provided with a hook, and the sewing thread pulled out from the lower bobbin is attached to the hook of the sewing machine needle that pierces the object to be sewn from above and protrudes below the object to be sewn. It is known that the above-mentioned thread hook is hooked with a hook and the sewing thread loop is pulled upward (see Japanese Patent Publication No. 53-42978 and Japanese Utility Model Publication No. 61-852, etc.).

(Problem to be solved by the invention) When sewing with the above single chain stitch multi-needle sewing device.

The material to be sewn is sewn so that the thickness t and the stitch pitch p are almost equal, and the height a of the top dead center of the sewing machine needle (distance between the top surface of the material and the needle hole) and the above-mentioned stitches are Between pitches p<
When there is a relationship of a<2p.

Sewing work can be performed smoothly and good seams can be obtained. Therefore, the range of thicknesses 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, in the past, 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 an upper pressing plate. When suturing flexible and thick objects whose thickness easily changes due to pressure, such as cushioning materials, pine tresses, filter materials, or two pieces of fabric separated vertically by a distance of It was extremely difficult to adjust the amount.

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 cannot tighten the flexible workpiece mentioned above. It was not possible to adequately adjust the amount of addition and subtraction.

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. An upper surface guide plate in contact with the upper surface is provided to be height-adjustable, and a horizontal movable table capable of adjusting the front and rear same position vl is provided below the fixed guide plate. A pair of left and right rocking levers are provided that are driven to swing up and down between a tilted position tilted at a predetermined angle, and guide the lower end of the overlapping iron connected to both ends of the needle stand so that it can move up and down vertically. ,
The swing lever is connected so as to be slidable along a guide provided along the length direction 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.

Further, although 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, the object to be sewn can be continuously advanced. 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 rocking lever swings up and down between the horizontal position and the tilted position, the needle rest swings up and down via the vertical rod, and when the rocking lever is in the tilted 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. When you reach the bottom of the stroke, about 5
When the swing lever drive mechanism is set so that the swing lever moves down approximately 5 degrees after reaching the lowest point, the bottom end of the sewing machine needle You can hook the sewing thread loop on the looper or hook the sewing thread on the hook of the sewing machine needle.

These hooks are easier to operate.

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 seam that matches the height of the upper guide plate is formed, and is flexible and thick. The amount of tightening of objects to be sewn with a large amount 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.
The two upper and lower sheets are sewn together with the above-mentioned distance apart, and a bag that does not bulge beyond the above-mentioned distance is obtained.

In addition, when the top guide plate is moved up and down in conjunction with the horizontal movement back and forth, the height of the top guide plate is adjusted in conjunction with the vertical movement of the sewing machine needle, and the height of the top guide plate is always matched to the height of the top guide plate. The vertical stroke of the sewing machine needle can be obtained.

In addition, if the horizontal moving table is moved back and forth at a constant cycle,
Since the vertical stroke of the sewing machine needle increases and decreases at regular intervals, a sewn article whose thickness changes in a chevron shape is obtained.

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 extend in the front, back, left and right directions of a rectangular base 1 fixed on the floor F (the left side of the figure is the rear).
is fixed, and a rectangular horizontally movable table 3 rides on this rail 2 so as to be slidable back and forth by legs 3a on the lower surface thereof. 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 6b is attached to the rear end of the screw shaft 6. By turning the handwheel 6b, the horizontal moving table 3 moves back and forth and stops at a desired position.

The rear end of the swinging lever 8, which is long in the front and back direction, is attached to the bracket 7 fixed to the left and right rear ends of the horizontal moving table 3, and the rear end of the swing lever 8 is attached to the bin 7a.
It is connected so that it can swing up and down. This swing lever 8 has
A guide groove 8a is formed along its length,
A sliding pin 10 attached to the lifting block 9 is slidably fitted into the guide groove 8a. The elevating block 9 is mounted on a vertical guide 11 erected at the left and right center of the fixed base 1 so as to be vertically slidable. Further, a motor 1 is provided on the tip side of the guide groove 8a.
The tip pin 13b of the crank 13, which is driven by the crank 13 and rotates counterclockwise, is slidably fitted therein, and as the crank 13 rotates, the swing lever 8 moves up and down between the horizontal position and the inclined position shown in the figure. It is designed to oscillate. In addition, 12a is a motor sprocket, 14 is a transmission chain, 13a is a crank sprocket, and 15 is a crank stand.

The upper needle rest 17 connected to the above-mentioned lifting block 9 by a vertical iron 16 is formed long in the width direction and is supported by a side frame (not shown) so as to be vertically slidable. A large number of chain stitch sewing machine needles 19 are fixed downward. A thread hook 20 for chain stitching is provided below the sewing machine needle 19, and the thread hook 20 is fitted onto a spline shaft 21 and is driven by a cam 22 rotating together with the spline shaft 21. When the sewing machine needle 19 descends, the sewing thread Y is hung on the hook at its tip 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 rotates in synchronization with the vertical movement of the sewing machine needle 19 by transmission from the motor 12 below.

A fixed guide plate 31 for placing and guiding the article S to be sewn is provided above the thread hooking tool 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 L-shaped lifting frame 3 is attached to the rear upper vertical guide rail 35.
The vertical portion 36a of the L-shaped elevating frame 36 is attached to the vertical portion 36a of the L-shaped elevating frame 36 so as to be vertically slidable via the sliding block 37.
The upper guide plate 3 is attached to the lower surface of the upper guide plate 6b via the leg portion 36c.
4 is fixed. The left and right L-shaped frames 36 are integrally connected by a widthwise beam 36d, and a nut 38 is fixed to the widthwise center of the upper beam 36d.
The threaded portion of the vertical threaded shaft 40 is screwed into.

By rotating a hand-cranked handle 40a fixed to its upper end, the upper guide plate 34 is moved through the L-shaped vertical frame 36.
height is adjusted.

In the above structure, the sewing thread Y pulled out from the sewing thread cheese Ya is passed through the thread hooking tool 20, the needle hole 31a of the fixed guide plate 31, and the needle hole 34a of the upper surface guide plate 34, and is hung on the hook of the upper sewing machine needle 19. When 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 the sewing machine needle 19 is driven by the motor 12 to move up and down. The movement is performed, and multiple rows of loops are applied to the object S to be sewn. 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 stroke of the lifting block 9 changes. The upper end position of the vertical stroke changes. That is, the vertical stroke of the sewing machine needle 19 and its upper end position change.

However, the lower end position of the vertical stroke does not change.

Therefore, while adjusting the height of the sewing machine needle 19 by turning the lower handle 6b with the swing lever 8 in the inclined position and the sewing machine needle 19 located at the upper end of the vertical stroke,
By turning the manual handle 40a for the upper L-shaped frame 36 and setting the height of the upper guide plate 31 to a height corresponding to the vertical stroke of the sewing machine needle 19, a flexible cushion like a cushion filled with foam rubber is created. The object S to be sewn can be sewn to a desired thickness and with appropriate tightness.

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. The upper sheet guide plate 33 is fixed by the fixed guide plate 31 and the lower sheet guide plate 32, and the upper sheet B is placed between the upper guide plate 34 and the upper sheet guide plate 33. The upper sheet A and the lower sheet B are respectively inserted and sewn together in a vertically separated state. Note that the upper sheet guide plate 33 and the lower sheet guide plate 32 are provided with long needle holes 33a and 32a, respectively, whose front ends are open, allowing the thread Y extending over the upper and lower sheets A and B to escape.

In the embodiment shown in FIG. 3, the horizontal moving table 3 is reciprocated back and forth at a predetermined period, and in synchronization with this, an L-shaped lifting frame 36 is moved back and forth.
It is made by reciprocating up and down.

That is, the screw shaft 6 for moving the horizontal moving table 3 back and forth is driven by the horizontal moving motor 5.
The horizontal moving table 3 reciprocates back and forth at a constant period due to forward and reverse rotation of the sewing machine, and accordingly, the vertical stroke of the sewing machine needle 19 repeats a gradual decrease and a gradual increase.

On the other hand, the vertical screw shaft 4o for raising and lowering the upper L-shaped lifting frame 36 is driven by a height adjustment motor 39, and its forward and reverse rotation causes the L-shaped lifting frame 3
6 moves up and down, and the height of the upper surface guide plate 34 changes in accordance with the change in the height of the upper end of the up/down stroke of the sewing machine needle 19, that is, the top dead center. In addition, the fixed guide plate 3
An upper sheet guide plate 32 is fixed above 1, 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 that 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 through the legs 24a so as to be slidable back and forth. It is biased backward by a tension coil spring 25 attached to the rear surface, and can be moved backward 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 the chain 27 is fixed to a feed chain sprocket 28. An electromagnetic clutch (not shown) is provided coaxially with the feed chain sprocket 28. A driving sprocket 29, which is attached and detached by a drive sprocket (not shown), is driven from a winding device for sheets A and B located in front via a transmission chain 30, and continuously rotates clockwise at a constant speed. Therefore, when the driving sprocket 29 and the feeding chain sprocket 28 are connected by the electromagnetic clutch, the upper frame 24 moves forward at a speed equal to the winding speed of the upper sheet A and the lower sheet B, and the above connection is broken. When it falls down, it retreats due to the elasticity of the tension coil spring 25. Note that the spline shaft 21 moves back and forth together with the horizontal moving table 3, and the thread hooking tool 20 and cam 22 move along the upper frame 24 and the needle rest 17.
move forward and backward.

In the embodiment shown in FIG. 3, the horizontal moving table 3 reciprocates back and forth by the forward and reverse rotation of the horizontal moving motor 5, and the swinging lever 8 swings up and down by the rotation of the swinging motor 12. The height of the upper guide plate 34 is changed by the forward and reverse rotation of the height adjustment motor 39, and the upper frame 24 is adjusted to the sewing pitch by the rotation of the winding device in front and the intermittent operation of the electromagnetic clutch between the sprockets 28 and 29. The upper sheet A and the lower sheet B are sewn by reciprocating back and forth. Then, as the horizontal movement table 3 gradually moves back and forth while the swing lever 8 repeatedly swings up and down, the needle rest 1
7 has been changed, and at the same time the upper guide plate 3
The height of the upper and lower sheets A is changed, and the interval between the upper and lower sheet guide plates 32 and 33 is narrowed or widened.
, B are sewn into the shape shown in FIG. Therefore, by cutting the sheets A and B shown in Fig. 3 at their tops and troughs, forming a wedge-shaded line in the shape shown in Fig. 4, and then sewing both ends to form a bag, the inner pressure can be reduced. A wedge-shaped bag filter that does not collapse is obtained.

In the above embodiment, a looper is used for hooking the thread instead of the tool 20, and when the sewing thread Y is supplied from above, the spline shaft 2
1 can be replaced with another driving source. Further, even when the thread hooking tool 20 is used, 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.

(Effects of the Invention) The invention described 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. The height of the top guide plate in contact with the top surface of the sewing item can be changed arbitrarily according to the above-mentioned lifting stroke.
Flexible materials such as foam rubber or cotton-containing mats can be sewn to a desired thickness and with desired tightness. Further, according to the second aspect of the invention, two sheets can be sewn together at a desired interval. 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 a bag 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, 8
a Ni guide groove, 11: Vertical guide, 16: Vertical rod,
17: Needle stand, 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 guide plate, S: Sewn object, A: Upper sheet (sewn object), B: Lower sheet ( (object to be sewn), Y: Sewing thread. Figure 1 Figure 5

Claims (1)

[Scope of Claims] [1] A needle rest in which a large number of sewing machine needles are fixed with their tips facing downwards is provided so as to be able to move up and down, and a material to be sewn that is fed horizontally below the needle stand is provided with a plurality of rows of single rings. In a multi-needle sewing device for sewing, a height-adjustable upper guide plate in contact with 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 horizontal movable table whose position in the front and back direction can be adjusted is provided below the fixed guide plate, and the horizontal movable table 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 end of a vertical rod connected to both ends of the needle stand so that it can move up and down vertically. A multi-needle sewing device characterized in that the needles are connected so as to be slidable. [2] 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 sewing device according to claim 1. [3] Claim 1 in which 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. or the multi-needle suturing device described in 2. [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 any one of claims 1 to 4, 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.