JPH0321197B2 - - 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.
When sewing various objects having different thicknesses such as cushion materials and filters, the setting of the vertical stroke of the sewing machine needle can be easily changed according to the 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, Japanese Utility Model Publication No. 61-852, etc.) are known.

(Problems to be Solved by the Invention) When sewing is performed using the above-mentioned single-chain-stitch 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 When there is a relationship p<a<2p between the height a of the sewing machine needle's top dead center (distance between the top surface of the object to be sewn and the needle hole) and the stitch pitch p, the sewing work can be performed smoothly. , a good seam can be obtained. Therefore, the range of thickness of the workpiece that can be sewn with a constant vertical stroke of the sewing machine needle is extremely narrow, with a limit of 2 times the thickness, and wide ranges of thickness from 5 mm to 100 mm, such as pine dresses and cushions. When the range is extended, it is extremely difficult to sew them using a single multi-needle sewing machine.

In order to solve this problem, a plurality of pin holes are drilled along the length of the crank, and the connecting pins are replaced depending on the thickness of the object to be sewn. However, in this case, 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 this adjustment is extremely troublesome.
The vertical stroke of the sewing machine needle can only be changed in stages, and therefore it is not always possible to obtain the optimum stroke no matter what thickness the object to be sewn has.

The present invention provides a multi-needle sewing device that allows the vertical stroke of a sewing machine needle to be set continuously and extremely easily with a simple operation.

(Means for Solving the Problem) A needle stand 17 in which a large number of sewing machine needles 19 are fixed with their tips facing downward is provided so as to be movable up and down.
In a multi-needle sewing device that performs multiple rows of single chain stitches on a workpiece A that is fed horizontally below the workpiece A, a guide plate 23 supports and guides the workpiece A.
Horizontal moving table 3 whose position can be adjusted in the longitudinal direction below
A pair of left and right swing levers 8 are provided on the horizontal movable table 3 and are driven to swing up and down between a horizontal position and an inclined position inclined at a predetermined angle with respect to the horizontal position. The lower end of the vertical rod 16 connected to both ends of the needle rest 17 is guided vertically up and down, and is connected so as to be slidable along a guide 8a provided along the length of the swing lever 8. . Note that the horizontal position of the swing lever 8 does not mean that the swing lever 8 is strictly horizontal at the lowest point of the swing range, but when the swing lever 8 reaches the lowest point. The position may be about 5 degrees below the horizontal line.

(Function) When the swing lever 8 swings up and down between the horizontal position and the inclined position, the needle rest 1 is moved through the vertical rod 16.
7 swings up and down, and when the swing lever 8 is in the inclined position, the needle rest 17 is located at the upper end of the stroke, and when the swing lever 8 is in the horizontal position, the needle rest 17 is located at the lower end of the stroke. And horizontal moving table 3
When the position of moves back and forth, the vertical stroke of the needle rest 17 changes. However, since the needle rest 17 is located at the lower end of the stroke when the swing lever 8 is in the horizontal position, only the upper end position of the stroke changes as the stroke changes, and the lower end position does not change. Note that if the drive mechanism of the swing lever 8 is set so that when the swing lever 8 reaches the lowest point of its stroke, it is approximately 5 degrees below the horizontal line, the swing lever 8 will reach its lowest point. When the swing lever 8 is accurately horizontal after rising approximately 5 degrees from the
The sewing thread loop at the lower end of the sewing thread loop 9 can be hooked on a looper, or the sewing thread can be hooked on the hook of the sewing machine needle 19, and these hooking operations are facilitated.

(Example) In the drawing, 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 5 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 swinging lever 8, which is long in the front and back direction, is connected to brackets 7 fixed to the left and right sides of the rear end of the horizontal moving table 3 by pins 7a so as to be able to swing up and down. This swing lever 8 has a guide groove 8a formed along its length.
Then, a sliding pin 10 attached to the lifting block 9 is slidably fitted. 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 is driven by a cam 22 that fits onto a spline shaft 21 and rotates together with the spline shaft 21. Sewing thread Y is attached to the hook at the end. In addition,
The above cam 22 is supported on the main body frame,
Further, the spline shaft 21 is supported on the horizontal movable table 3, and rotates in synchronization with the vertical movement of the sewing machine needle 19 by transmission from the motor 12 below. and,
A guide plate 23 for supporting and guiding the object A to be sewn is provided between the sewing machine needle 19 and the thread hook 20.

In the above structure, the sewing thread Y pulled out from the sewing thread cheese Ya is passed through the thread hook 20 and the needle hole 23a of the guide plate 23 and hung on the hook of the upper sewing machine needle 19, and the article to be sewn A is placed on the guide plate 23. When the machine is operated, the material to be sewn A is intermittently fed forward at a predetermined pitch, and the sewing machine needle 19 is moved forward by the motor 1.
2, it moves up and down, and multiple rows of chain stitches are applied to the object A to be sewn. However,
When the handle 6a of the screw shaft 6 is turned, the horizontal moving table 3 moves back and forth, and the fulcrum 7a of the swing lever 8
The distance of the vertical guide 11 changes, the lifting stroke of the lifting block 9 changes, and the upper end position of the lifting stroke changes. That is, sewing machine needle 1
9 and its upper end position change. However, the lower end position of the vertical stroke does not change. Therefore, by adjusting the height of the sewing machine needle 19 by turning the handle 6b while the swing lever 8 is in the inclined position and the sewing machine needle 19 is located at the upper end of the vertical stroke, the thickness of the workpiece A can be adjusted. The optimum stroke 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. Furthermore, 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 lowermost position.

(Effects of the Invention) This invention provides a swinging lever with a predetermined stroke on a horizontal movable table whose position can be adjusted back and forth, so that its lower end position is almost horizontal, and a vertical rod is connected to the swinging lever. Since the needle stands are connected, the vertical stroke of the sewing machine needle can be changed by adjusting the longitudinal position of the horizontal moving table. Furthermore, since only the upper end position of the vertical stroke changes and the lower end position does not change, there is no need to adjust the height of the guide plate, looper, thread hook, etc. that support the sewing object. Therefore, the optimum stroke for the thickness of the object to be sewn can be easily set by an extremely simple operation.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of an embodiment of the invention. 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,
Y: sewing thread, A: object to be sewn.

Claims (1)

[Claims] 1. A multi-needle sewing machine with a needle base in which a large number of sewing machine needles are fixed with their tips pointing downwards, which can be moved up and down, and multiple rows of single chain stitches can be performed on the material to be sewn, which is fed horizontally below the needle base. In a sewing device, a horizontal movable table whose position in the front and back direction can be adjusted is provided below a guide plate that supports and guides the workpiece, and a horizontal position and a predetermined angle with respect to the horizontal position are set on the horizontal movable table. A pair of left and right swing levers are provided which are driven to swing up and down between the inclined position and the needle rest, and 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. A multi-needle sewing device characterized in that a swing lever is connected so as to be slidable along a guide provided along the length direction.