JPS61239073A - Cloth widening apparatus in embroidering sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a spreading device used in an embroidery sewing machine to control the transfer of a long base fabric in a spread state.

(Prior Art) As a conventional technology, there is, for example, Japanese Unexamined Patent Publication No. 197364/1983.

(Problems to be Solved by the Invention) In conventional embroidery sewing machines of this type, when controlling the transfer of a long base fabric, the stretched state of the base fabric is unstable and the embroidery pattern may be deformed or inaccurate. There were some easy problems.

SUMMARY OF THE INVENTION An object of the present invention is to provide a spreading device for an embroidery sewing machine that avoids the above-mentioned problems and can control the transfer of base fabric in a stable and uniformly spread state.

(Means for Solving the Problems) The present invention provides synchronization in the roller axial direction with respect to the front and back of the needle head in order to transport the base fabric in a curved manner at the front and rear of the needle head and to transport the base fabric straight in the vicinity of the needle head. A plurality of rollers arranged in the circumferential direction of the feed roller are attached to each roller arm of a pair of front and rear feed rollers horizontally mounted so that the movement can be controlled. The slide plates are respectively movable in the axial direction of the rollers and attached in a left-right and left-right facing manner, and each row of slide plates arranged at each roller end of both the feed rollers has a slide plate in each row. The gist of the present invention is to include a spreader device 4 in which fixed cam means are provided in opposition to each other to control the movement in the axial direction of the rollers to control the spread width of the curved portion.

(Function) The device of the present invention has a row of slide plates for expanding the curved portion of the base fabric for each roller end of a pair of feed rollers arranged in parallel to control the transfer of the base fabric in the width direction and longitudinal direction. Each slide plate row is controlled to move in the axial direction of the roller by a cam means to equalize the spreading state of the base fabric when it moves from the curved part to the vicinity of the needle head. .

(Example) To summarize, an example of the present invention will be described with reference to the drawings.
In the figure, 1 is the bed of embroidery sewing machine M, and 2 is the bed 1.
The flat surface installed on the top is a frame with an opening shape, 3 is an appropriate number of sewing machine heads arranged along the longitudinal direction with respect to the horizontal part 2a of the frame 2, and each is equipped with an appropriate number of sewing needles 4.
are arranged in parallel.

5 to 5 are two pairs of left and right rails placed horizontally in parallel near both ends of the bed 1, and 6 to 6 are installed on both rails 5 on both sides so as to be slidable in the left and right direction. 7A is a main drive box placed horizontally on both bases 6 on the right side in the figure so as to be able to co-move with the bases 6; 7B is a main drive box 7A on both bases 6 on the left side in the figure. 8 is a first control motor attached to the upper right end of the frame 2; 9 is attached near the center right side of the frame 2; A second control motor is mounted near the center of the main drive box 7A, and a ball screw 10 directly connected to the motor shaft 9a is mounted near the center of the main drive box 7A to control the movement of the main drive box 7A in the width direction of the base fabric. The control motors 8, 9 are screwed into a pole nut 11, and both control motors 8, 9 are synchronously driven in forward and reverse directions based on a base fabric transfer signal transmitted in accordance with the embroidery pattern.

Reference numeral 12.12 denotes a pair of front and rear feed rollers that are rotatably mounted horizontally in parallel to the front and rear of the main and sub-drive boxes 7A and 7B. 2 in a curved manner in a folded manner, respectively, and horizontally in a straight line between the two curved advancing parts Kl and K1, each of the two feed rollers 12 is At the roller end, guide protrusions 12a to 12a having a T-shaped cross section and protruding along the roller axis are arranged parallel to the circumferential direction, and are arranged in parallel to the feed roller 12 disposed on the rear side. A spline shaft 15 which is rotationally driven by the first control motor 8 via a belt 14 is directly connected to the spline shaft 15, and both feed rollers 12 are fitted to the spline shaft 15 so as to be able to slide in the axial direction and rotate together with the spline shaft 15. Main drive box 7
A pulley 25 rotatably supported by A and a pulley 26 fitted onto the shaft end of the front feed roller 12 are connected via a belt 27 to enable synchronous rotation in the same direction. Both feed rollers 12 are synchronously rotated by a predetermined angle by the forward and reverse rotations of the first control motor 8 whose rotation is controlled based on the base fabric transfer signal, and at the same time, they are rotated 1till' based on the base fabric transfer signal. The forward and reverse rotation of the second control motor 9 causes the main and sub-drive boxes 7A and 7B to move synchronously in the roller axial direction.

16 to 16 are movable independently in the axial direction of the rollers 12 and attached to each roller end of both feed rollers 12 so as to spread 1 in the width direction on the curved portion of the base fabric, and are attached to the left and right opposite sides. , are slide plates arranged parallel to the circumferential direction, each of which is formed in the shape of a strip of the same shape slightly curved in the width direction, and can be slid between each guide protrusion 12a of both feed rollers 12. is fitted in.

Then, near the inner end of each slide plate 16, bin plates 17 to 17 each having a protruding bin 17a for puncturing the hem of the base fabric and stretching the base fabric K in the width direction are attached. On the other hand, in the vicinity of the inner end of each slide plate 16, rollers 18 to 18 which are rotatably supported are protruded.

19~ One is each slide plate row P~ arranged in the circumferential direction for each roller end of both feed rollers 12.
These are cylindrical cams fixedly placed surrounding each slide plate row P in order to collectively control the movement of P in the roller axial direction to control the expansion and contraction of the spread width on the base fabric, and both driving boxes 7A, Each slide plate is supported via a cylindrical support member 20 which is attached to the roller ends of both feed rollers 12 by fitting them onto the roller 7B.
The recessed cam grooves 19a for controlling the movement of the cams 16 in the lower and lower axis directions are each curved into an endless shape, and the cam grooves 198 of the left and right cams are formed symmetrically, and each The slide plate 16 is the feed roller 12
As the feed rollers 12 rotate from the lower position to the upper position, the bin plates 17 on both sides are displaced from the inside to the outside of the feed roller 12.
The interval gradually increases, and each slide plate 16 is displaced from outside to inside of the feed roller 12 as the feed roller 12 rotates from the upper position to the lower position, and the bin plates 17 on both sides are displaced from each other. The interval is gradually decreased, and the spreading width of 1 in the curved portion gradually increases toward the 2 side in the straight portion.

21 to 21 are a pair of front and rear bell 1-wheels that are rotatably supported near each roller end of both feed rollers 12 for both drive boxes 7A and 7B, and 22° and 22 are front and rear belt wheels 22 on both sides. A pair of left and right clothing belts are hung so as to be able to rotate, respectively, and are spaced apart so as to be approximately equal to the distance between the bin plates 17 of the slide plates 16 on both sides that have been rotated to the upper position. At the same time, a group of bottles for puncturing the hem into the base fabric is planted all around the circumference, and the straight parts on the upper and lower sides restrict the movement of the straight parts in the width direction of the base fabric. The upper and lower guide grooves 238 of a pair of guide members 23 placed horizontally in left and right parallel configurations
．． 23a, and both sides of the base fabric when transitioning from the curved part 1 to the straight part 2, and from the straight part 2 to the curved part 1. The hem is transferred from the bin plate 17 of the slide plate 16 to the clothing belt 22 or from the clothing belt 22 to the bin plate 17 with the same widening width, and the base fabric has 1 at the curved part on both the front and rear slide plates. A double-clothed belt 2 is stretched between rows 2 and 2 is in the straight section.
In the expanded state spread between the two, the movement of both feed rollers 12 in the roller axial direction controls the transfer in the width direction of the base fabric, and at the same time, the rotation of both feed rollers 12 and both cloth belts 22. The transfer to the base fabric in the longitudinal direction is controlled by.

Note that 24 is a hook base placed below the sewing needle 4.

Next, the operation and effects of the embodiment having the above configuration will be explained.

Now, in this example, in order to move the base fabric K in a curved manner at the front and rear of the needle head H, and to transport the base fabric straight in the vicinity of the needle head H, rollers are used respectively at the front and rear of the needle head H on the base fabric. At each roller end of a pair of front and rear feed rollers 12, which are reversibly mounted horizontally so as to be able to control synchronized movement in the axial direction, there is a periphery of the feed roller 12 in order to spread 1 in the width direction at the curved portion of the base fabric. A plurality of slide plates 16 are arranged parallel to the direction and each has a bin plate 17 attached thereto, each of which is movable independently in the roller axis direction and is attached to the left and right oppositely. In each slide plate row P arranged at each roller end, each slide plate 16 is displaced in the roller axis direction so that the base fabric width of 1 is expanded in the curved part and the 2nd side is gradually expanded in the straight part. Each of them is provided with one fixed cam for controlling expansion and contraction.

For this reason, when performing embroidery by horizontally transferring the base fabric K in the width direction and longitudinal direction, the base fabric is always expanded to a predetermined width and moves from 1 in the curved part to 2 in the straight part. As the needle is always stretched in a constant state of tension near the needle head H, the stretched state of the base fabric is balanced and stabilized, and the base fabric K can be stably and accurately transferred, and the embroidered pattern can be accurately sewn. This has the effect of suppressing deformation of the embroidery pattern caused by improper stretching of the base fabric.

(Effects of the Invention) In other words, the present invention enables synchronized movement control in the roller axial direction for the front and rear of the needle base in order to move the base fabric in a curved manner at the front and rear of the needle base and to transport the base fabric straight in the vicinity of the needle base. A plurality of slide plates arranged in the circumferential direction of the feed rollers are installed at each roller end of a pair of front and rear feed rollers that are reversibly mounted horizontally on the feed rollers in order to spread the curved portion of the base fabric in the width direction. The rollers are movable independently in the axial direction and are attached to the left and right opposite each other, and each row of slide plates arranged at each roller end of both feed rollers has a slide plate in each row moved in the axial direction of the roller. By disposing stationary cam means in order to control the movement and expand/contract the spread width of the bending portion, the spread state of the base fabric is balanced and stabilized, and the base fabric can be accurately transferred. It has a moisturizing effect.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a front view of the main parts, FIG. 2 is a view taken along the line x--X of FIG. The figure is also a front view, and FIG. 5 is an enlarged view along YY line of FIG. 1. 12... Feed roller 16... Slide plate 19... Cam H... Needle base K... Base fabric 1... Curved portion P... Slide plate row

Claims (1)

[Claims] In order to transfer the base fabric in a curved manner at the front and rear of the needle head, and to move the base fabric straight around the needle head, a pair of front and rear rollers are mounted on the front and rear sides of the needle head so as to be able to control synchronized movement in the direction of the roller axis. Each roller end of the feed roller has a plurality of slide plates arranged in the circumferential direction of the feed roller in order to spread the curved portion of the base fabric in the width direction. At the same time, each row of slide plates arranged at each roller end of both the feed rollers is provided with slide plates arranged in opposite directions, and the slide plates of each row are controlled to move in the direction of the roller axis to expand the curved portion. 1. A fabric spreading device for an embroidery sewing machine, characterized in that fixed cam means are provided in opposition to each other for controlling width expansion/contraction.