JPH03215286A - Multineedle sewing device - Google Patents

Abstract

PURPOSE:To increase or decrease the length of a lift stroke by interposing a swing lever having one end supported swingably back and forth between a needle bed and the upper end of a connecting rod, and adjusting a fixed position of a swing block according to the thickness of an article to be sewn. CONSTITUTION:The vertical movement of a connecting rod 7 is transmitted to a needle bed 1 through a connecting pin 20, swing lever 10, slide block 15 and connecting pin 25. The needle bed 1 carries out the vertical movement with a certain stroke along a vertical guide 4. Then, a fulcrum 13 of the swing lever 10 swings back and forth. When the upper and lower end positions of the lift stroke are symmetrical about a horizontal line passing through the fulcrum 13 of the swing lever 10, the lower end position of the lift stroke is hardly changed and only the upper end position is largely changed. Thus, by setting a locus of the moving fulcrum 13 of the swing lever 10 somewhat downward relative to the horizontal and a locus of the moving lower dead point of the connecting rod 7 close to the locus of the moving fulcrum 13 of the swing lever 10, the lift stroke can be increased and decreased without changing the lower end position of the lift stroke.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a multi-needle sewing device used in the manufacture of tatami floors, etc. The stroke amount can be set to any size, and the lower end position of the stroke is maintained at a substantially constant height when the stroke amount is changed. (Prior art) As a sewing machine for applying multiple rows of single-ring stitching to objects to be sewn such as tatami floors, a widthwise long needle base with multiple sewing machine needles fixed downward is installed on both the left and right sides. The needle rest is guided by a vertically positioned guide, and the needle rest is raised and lowered via a pair of left and right connecting rods that reciprocate up and down by a cam or crank located below, synchronizing with the movement of the needle rest up and down. There is a known sewing machine in which the sewing needle described above is used to sew objects to be sewn, such as tatami floors, which are fed forward below the needle stand. As a means for changing the vertical stroke of the needle rest in such a multi-needle sewing device according to the thickness of the material to be sewn, a plurality of pin holes are drilled along the length of the crank. It is known to maintain the height of the bottom dead center of the sewing machine needle constant by replacing the connecting pin with the connecting rod depending on the thickness of the sewing item and adjusting the length of the connecting rod. In addition, in this type of width chainstitch sewing machine, the thread is hung on the sewing machine needle near the bottom dead center to perform the desired operation, so when changing the ascending stroke of the needle base, It is necessary to change the top dead center position without changing the . Further, a horizontally movable table is provided below the fixed guide plate that supports and guides the object to be sewn from below, and a pair of left and right swinging levers are provided on the horizontally movable table so as to be vertically swingable. The lower ends of the connecting ports 7 at both ends are guided vertically up and down, and the lower ends of the connecting holes 7 and 7 are slidably connected to a guide provided along the length direction of the swinging lever. While the needle rest is raised and lowered by the vertical movement of the moving lever, by changing the longitudinal position of the horizontal movement table, the connection position of the lower end of the connecting rod with respect to the guide of the swinging lever is changed, thereby raising and lowering the needle rest. It is known to change the ascending stroke without changing the height of the bottom dead center (see Japanese Patent Laid-Open No. 1-285289).

(Problem to be Solved by the Invention) However, the means for replacing the connecting pin between the crank and the connecting rod requires changing the setting of the lifting stroke because it is necessary to replace the bottle and also adjust the length of the connecting rod. The work for this was troublesome. In addition, while the means for driving the needle rest via the connecting iron by means of a swinging lever provided on the horizontal moving table makes it easy to change the setting of the elevating stroke, the mechanism for elevating the needle rest is different from the conventional one. This is fundamentally different from a mechanism using a crank, a cam, etc., and has the problem of being more complicated than the conventional mechanism.

This invention makes it easy to change the settings of the lifting and lowering scroll, maintains the height of the bottom dead center almost constant during the change, and has a simple mechanism, allowing conventional cranks, cams, etc. to be used as is. This provides a multi-needle suturing device that can (Another Means to Solve the Problem) The device of this invention (see Fig. 1) has a large number of sewing machine needles 2.
is fixed downward and is vertically movable along a guide 4 in the vertical direction. A widthwise long needle rest l is raised and lowered via a pair of left and right connecting rods 7 that are driven up and down. The above-mentioned sewing machine needle 2
In a multi-needle sewing device that performs multiple rows of single chain stitches, there is a
A sliding block I5 is provided with a vertically swingable swinging lever IO having a fulcrum l3 that can freely move forward and backward tX, and can be fixed to this ta moving lever IO at any position in its length direction.
Install the above swing lever IO and sliding block l.
5, connect the upper end of the connecting rod 7 with the connecting pin 20 in the width direction, and connect the end of the needle rest l with the connecting pin 2 in the width direction on the other side.
5 (see Figure 2), each of which is rotatably connected. (Function) As the connecting rod 7 moves up and down, the up and down movement is transmitted to the needle rest 1 via the connecting pin 20, the moving lever 10, the sliding block 15, and the connecting pin 25, and the needle rest 1 moves in the vertical direction. The lever IO moves up and down with a constant stroke along the guide 4, and at this time, the fulcrum l3 of the swing lever IO swings back and forth. Then, the upper end of the connecting rod 7 and the sliding block 1
5 overlaps with each other, the ascending and descending stroke of the connecting rod 7 coincides with the ascending stroke of the needle stock l, but the upper end of the coupling rod 7 is located closer to the fulcrum 13 of the swing lever IO than the needle stock l. When the upper end of the connecting rod 7 is located on the opposite side, the vertical stroke of the connecting rod 7 is reduced and the vertical stroke of the needle base l becomes large. The lifting stroke of platform I becomes smaller. Furthermore, when the upper and lower end positions of the vertical stroke are symmetrical with respect to the horizontal line passing through the fulcrum l3 of the swing lever IO, the upper and lower end positions of the vertical stroke due to the change in the upper end position of the connecting rod 7 are Although the changes are the same, when the lower end position of the lifting stroke rises and approaches the horizontal line, the lower end position of the lifting stroke hardly changes, and only the upper end position changes significantly. Therefore, the movement locus of the fulcrum l3 of the oscillating rehear 10 is set slightly downward with respect to the horizontal line, and the movement locus of the bottom dead center of the connecting rod 7 is brought close to the movement locus of the fulcrum 13 of the 1-5-movement rehear 10. This makes it possible to increase or decrease the W lowering stroke without changing the lower end position of the lifting stroke. (Example) In FIG. 1, the needle rest l is formed long in the machine width direction,
A large number of sewing machine needles 2 for single chainstitch are fixed downward at regular intervals along the lower surface of the sewing machine, and fixed to a frame (not shown) to a rising bronck 3 fixed to the end of the needle rest ■. A vertical guide shaft 4 is slidably inserted therethrough, and the needle rest 1 is guided by this guide shaft 4 and vertically moves up and down. There is a king shaft 5 which is long in the width direction below the needle rest l and rotates by a motor.
A crank 6 is fixed to the end of the main shaft 5.
The lower end of a long connecting rod 7 is connected to the tip of the pin 8 by a pin 8, and the top end thereof extends upward.

A swing lever IO is interposed between the upper end of the connecting rod 7 and the lifting block 3 fixed to the end of the needle rest l.

This swing lever lO is provided facing in the front-rear direction, and one end thereof is connected to the upper end of the swing arm +2 with the lower support shaft 11 as a fulcrum by a pin I3, and this pin l3 can swing in the front-rear direction. , and this pin l3 is formed on the swinging lever 1.
It constitutes a fulcrum for the vertical swing of 0. In addition, a slot 14 is formed along the length direction of this swing lever lO,
A sliding block l5 is slidably fitted into this slot l4, and a longitudinal adjustment screw l6 rotatably connected to this sliding block l5 is screwed into the free end l7 of the swing lever lO. , a lock nut H8 is attached to its protruding end. That is, by turning the adjustment screw l6, the sliding block 15 is moved in the longitudinal direction of the swing lever IO, and by tightening the long nut l8, the sliding block l5 is fixed at a desired position on the swing lever 10.

The groove hole 14 is located in the center of the swing lever IO.
A U-shaped pin plate l9 that straddles the pin plate l9 is fixed to the pin plate l9, and the upper end of the connecting rod 7 is attached to the bin 20 in the width direction.
connected by. In addition, on the sliding block 15,
A rear bronck 3a protruding from the elevating bronk 3 of the needle rest l is connected by a widthwise pin 25 (see FIG. 2).

In the above structure, when the main shaft 5 is driven, the crank 6 rotates, and the connecting rotor 7 performs an ascending movement up and down,
Accordingly, the 1g moving lever IO swings up and down about the pin l3 at one end, and the elevating bronck 3 and the needle rest l move up and down via the sliding block l5 and the back block 3a. At this time, the lifting block 3 moves up and down along the guide shaft 4, so the sliding block l5 and the swing lever IO, which are connected to the lifting block 3 via the back block 3a, are moved by the lifting block 3. pin l3, which is the fulcrum of the swinging arm I, is restrained by the movement of the swinging arm I.
It swings back and forth along the arc drawn by the upper end of 2. That is, as shown in FIG. 2, when the crank 6 rotates,
The lifting block 3 and the back block 3a are at the lower end position at! of the solid line, respectively. : Vertically ascends and descends between the upper end position b of the chain line, and during that time the fulcrum of the swinging arm IO is the swinging arm l.
2 swings back and forth between points A and B along the trajectory K of the tip. Point A is the fulcrum pin l3 at the lower end of the lifting stroke
Point B indicates the position of the fulcrum pin l3 at the upper end of the lifting stroke. A straight line P extending upward to the right passing through point B and point b indicates the position of the swing lever IO at the upper end of the raising stroke. When the sliding block I5 (see FIG. 1) is displaced by turning the adjusting screw l6, the pin 20 connecting the sliding block l5 and the connecting port 7 is moved at the lower end of the vertical stroke as shown in FIG. Move along arc G of . If the position of the sliding block l5 is temporarily fixed at the position of point C, then tN. The fulcrum pin 13 of the movable lever 10 moves to point C, and the straight line Q connecting points C, that is, the pivot lever i
The center line of o passes through almost the same position as point a above, so that the height of sliding block 15 and the height of needle rest l are almost equal to the initial height, but at the upper end of the lifting stroke, connecting rod 7 The connecting bin 20 at the upper end rises to point d, and at the same time, the fulcrum bin l3 of the swing lever IO moves to point D, and the swing lever 10 moves on the straight line R connecting points D and d. The position of dynamic pronk l5 is an inclined straight line R connecting a vertical line connecting points a and b and points d and D.
, and only the upper end position of the vertical stroke changes significantly. In the figure, m is the amount of change in this upper end position. In the embodiment shown in FIG. 3, instead of attaching the fulcrum pin l3 of the swinging lever lO to the tip of the swinging arm l2, a slotted guide 2l is provided in the frame in a direction slightly inclined with respect to the horizontal line in the front-rear direction. The swing lever IO is connected to the sliding block 22 that fits into the slot guide 2l by a fulcrum pin l3, and the fulcrum pin l3 moves back and forth along a precise straight line compared to the embodiment shown in FIG. #1 Move. In the embodiment shown in FIG. 4, the sliding block l5 of the swing lever IO
The upper end of the connecting rod 7 is connected to the upper end of the connecting rod 7, and a pin plate 19 fixed to the back side of the paper in the center of the tz moving needle 10 is connected to the elevating bronck 3 integrated with the needle rest 1 by a pin 25 in the width direction.

The fulcrum pin l3 may be connected to either the upper end of the swing arm l2 in FIG. 1 or the sliding block 22 in FIG. 3.

(Effects of the Invention) This invention provides a swinging lever, one end of which is supported so as to be swingable back and forth, between the base, the connecting port, and the upper end of the door, and the longitudinal position of the swinging lever can be adjusted arbitrarily. A configurable sliding block is installed, and one of the connecting ronds and the needle rest is connected to this swinging block, and the other of the connecting rond and the needle rest is connected to the above-mentioned sliding block, so the thickness of the material to be sewn can be adjusted. By adjusting the fixed position of the sliding block according to the above, it is possible to increase or decrease the magnitude of the lifting stroke without changing the lower end position of the lifting stroke, and only the upper end position of the lifting stroke can be changed. Moreover, since the above-mentioned oscillating rehear is interposed between the needle rest and the upper end of the connecting rond, and a sliding block is attached to this oscillating reher to transmit the vertical movement of the above-mentioned connecting rond to the needle rest, the needle rest Conventional elevating means such as cranks and cams for elevating and crushing can be used as is.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the invention, Fig. 2 is a side view illustrating the operation of the embodiment of Fig. 1, Fig. 3 is a side view of main parts of another embodiment, and Fig. 4 is It is a side view of the main part of still another Example. l Two-needle base, 2: Sewing machine needle, 3: Elevating block, 4: Vertical guide, 6: Crank, 7: Connecting rond, 10
: ta! Movable lever, l3: fulcrum that can freely swing back and forth, l4
: Slot hole, l5: Sliding block, 16: m-section screw, l
8: Lock nut, 19: Bin plate fixed to swing lever, 20, 25: Connecting bin.

Claims (1)

[Scope of Claims] [1] A large number of sewing machine needles are fixed downward and are moved up and down through a pair of left and right connecting rods that drive a widthwise long needle stand that can be raised and lowered along a vertical guide. In a multi-needle sewing device that is moved up and down and is configured to perform multiple rows of single chain stitches using the sewing machine needles on a workpiece that is fed forward and backward below the needle rest, the end of the needle rest and the connecting rod are connected to each other. A swinging lever that has a fulcrum that can swing back and forth and can swing up and down is interposed between the top end and the swinging lever, and a sliding block that can be fixed at any position in the length direction of the swinging lever. Attach the upper end of the connecting rod to one of the vibrating lever and sliding block, and connect the end of the needle stand to the other of the swinging lever and sliding block so that they can rotate freely using connecting pins in the width direction. A multi-needle sewing device characterized by being connected.