JPH0718378Y2 - Round string sewing machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a sewing machine for sewing a round string from a continuous tape-shaped string, and in particular, it can automatically form a round string. About the sewing machine.

[Conventional technology]

When a round string is sewn from a continuous tape-shaped string, a generally used sewing machine for lock stitch is usually used, and a round string forming tool is attached to the upper surface of the needle plate, and the tape-shaped string is attached to the round string. A circular cord is formed by sewing while passing through a forming tool.

FIG. 2 shows a perspective view of a main part of a conventional sewing machine for sewing a round cord. Even if it is called a round string sewing machine, a lockstitch sewing machine is usually used as described above, but in FIG. 2, the feed dog and the presser foot which are not used in the round string sewing are shown in the drawing. Is omitted.

In FIG. 2, the sewing machine bed 2, the needle bar 4, the needle 6, the sliding plate 8 and the like are the same as those of the lockstitch sewing machine. The point different from the lockstitch sewing machine is that the feed dog and the presser foot are not necessary, and that the round string forming tool 12 is attached to the needle plate 10.

As shown in FIG. 3, a perspective view is shown in FIG. 3, a view from the direction of the arrow in FIG. 3 is shown in FIG. 4, and a plan view is shown in FIG. The plate 16 is integrally fixed to the plate 16 by soldering or the like. A mounting hole 18 is formed in the mounting plate 16, and as shown in FIG. 2, the shaft portions of the fixing screws 20 and 20 are inserted into the mounting hole 18, and the screw hole formed in the needle plate 10 (see FIG. The round string forming tool 12 is fixed to the throat plate 10 by screwing the threaded portion on (not shown) and pressing the upper surface of the mounting plate 16 with the lower surface of the head.

The round string forming tube 14 is formed by fixing the outer cylinder 24 to the flat plate 22 so as to sandwich it from the vertical direction, and fixing the inner cylinder 26 to the inner side edge of the outer cylinder 24. When the round string forming tool 12 is fixed to the needle plate 10, the flat plate 22 and the outer cylinder 24 respectively have notches 28 and needle through-holes 30 and 30 '(see FIG. 6) at positions directly below the needle 6. (See) is formed. In addition, the rear end positions of the flat plate 22 and the outer cylinder 23 are located closer to the front than those shown in the drawing, and the needle is dropped to the position near the rear end of the flat plate and the outer cylinder without forming a notch or a needle through hole. It doesn't matter. The insertion opening 32 at the rear end of the inner cylinder 26 is at the needle drop position,
Therefore, the outer cylinder 24 is located rearward of the positions of the needle through holes 30 and 30 '. Further, the inner cylinder 26 has a cylindrical shape at the rear end portion, but the cylindrical surface is cut off in a semicircular shape from the middle to the front end. Of course, the inner cylinder may be formed in a tubular shape over its entire length.

To sew a round string from a tape-shaped string with a sewing machine that attaches the round string forming tool 12 to the needle plate 10, first, in the state where the round string forming tool 12 is removed from the needle plate 10, form the round string. Ingredient
Set the tape string to 12. To do this, fold the tape-shaped cord along the length and fold it in two.
The tape-shaped cord is inserted into the passage 34 formed by the inner surface of 24 and the outer surface of the inner cylinder 26 in an annular shape, and then the tip is inverted and inserted into the insertion port 32 of the inner cylinder 26. The tip portion of the tape-shaped cord is pulled out from the feeding port 36 at the tip through the inside. The round cord forming tool 12 with the tape-shaped cord thus set is positioned and attached to the needle plate 10 so that the needle through holes 30, 30 ′ of the outer cylinder 24 are located directly below the needle 6.

When the above preparation is completed, the sewing machine is driven while pulling the front end portion of the tape-shaped string toward the front side. As a result, as shown in FIG. 2, the continuous tape-shaped cord T is guided by the outer cylinder 24 of the round cord forming tool 12 and formed into an annular shape in the width direction so that both side edge portions along the transfer direction overlap each other. After being
Both edge portions are sewn together at the positions of the needle through holes 30 and 30 'of the outer cylinder 24. Then, as shown in FIG. 6 and FIG. 7 in the sewing state, a vertical sectional view taken along the line VI-VI and a vertical sectional view taken along the line VII-VII of FIG. 5, respectively, linearly along the transfer direction of the cord. The sewn portion S, which is formed into a tubular shape by being sewn, is inverted at the insertion port 32 portion of the inner cylinder 26, and is turned upside down to be guided into the inner cylinder 26. By thus turning over the tubular sewn portion S, the sewn portion S
The seam allowance portion S ′ of is sewn inside the cylinder of the sewn portion S to form the round string L. FIG. 8 shows the state of the inverted portion of the cord, omitting the illustration of the round cord forming tool 12. In the figure, N is a stitch. Then, the round string L is continuously sewn by continuously pulling the round string L toward the front side.

[Problems to be solved by the device]

By the way, when sewing a round string, with a conventional sewing machine, the operator starts the sewing machine and at the same time starts pulling the string in the transfer direction, and after sewing with a constant pulling force according to the sewing speed of the needle. The sewing is performed while pulling the round string part of the sewing machine continuously to stop pulling the string when the sewing machine stops.

As described above, conventionally, since the string is transferred manually when sewing a round string, it is difficult to always pull the string with a constant force, and if the pulling force changes during sewing, the string transfer speed may change. As a result, there is a problem that the stitches become uneven and the appearance of the sewn round cord becomes unsightly.

In addition, once the sewing machine is started, it is necessary to continue the work for a long time without interruption, while the worker must always pay close attention to prevent the stitches from becoming uneven. Therefore, there is a problem that the fatigue level of the operator becomes very large.

The present invention has been made in view of the above circumstances, and it is a technical subject to make it possible to automatically perform the sewing operation of a round string without manual labor.

[Means for Solving the Problems]

As a means for achieving the above object, this invention has made the following improvements to the above-described conventional sewing machine for sewing a round cord. That is, in the sewing machine for sewing a cord according to the present invention, the needle plate is provided with the feed dogs which are interlocked with the movement of the needles at intervals with respect to the cord forming tool, and the feed teeth are contacted above the feed teeth. A presser foot is arranged so that it can be separated, and
It is configured by arranging a guide tool for inverting the round string formed by the round string forming tool and guiding it to the position of the feed dog.

[Action]

When sewing a round string using the above-described sewing machine for sewing a round string, the round string drawn out from the round string forming tool is inverted by the guide tool and pressed toward the feed dog by the presser foot. In the state where the feed dog is securely bitten, the feed dog is automatically transferred by being pulled along with the rotation operation of the feed dog. At this time, since the movement of the feed dog is interlocked with the movement of the needle, the round string is pulled at a constant transfer speed that is always synchronized with the suturing speed by the needle, so that the stitches in the round string are uniformly aligned. It will be.

〔Example〕

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of an essential part of a sewing machine for sewing a round cord according to an embodiment of the present invention. In the figure, those denoted by the same reference numerals as those in FIGS. 2 to 5 are basically the same as the members shown in FIGS. 2 to 5. Therefore, its explanation is omitted.

This sewing machine differs from the conventional sewing machine for sewing a round cord shown in FIG. 2 in that a needle plate 40 is provided with a feed dog 42, and a presser foot 44 is abutted above the feed tooth 42. The guide roller 46 for guiding the round string L is arranged on the upper surface of the sewing machine bed 2.

In a normal lockstitch sewing machine, the feed dog and the presser foot are arranged at the needle drop position, but in this sewing machine, the feed dog 42 is provided at the needle drop position, and accordingly, is spaced from the round string forming tool 12, It is arranged substantially parallel to the longitudinal direction of the forming tube 14. This feed dog 42, like the feed dog of other general sewing machines, also has a needle 6
Is rotated on an elliptical orbit in a vertical plane in association with the movement of the above, and the round string L is transferred by the teeth on the upper surface.

The presser foot 44 is fixed by a fixing screw 52 to a front end portion of a horizontal mounting plate 50 which is fixed to a mounting rod 48 of the sewing machine main body by a fixing screw (not shown). Like the presser foot of other general sewing machines, this presser foot 44 can be brought into contact with or separated from the feed dog 42 by moving the mounting rod 48 up and down. The round string L inserted between the two is pressed against the feed dog 42, and the round string L can be reliably transferred by the feed tooth 42.

Further, the guide roll 46 is arranged at a position on the front side of the round cord forming tool 12 and the feed dog 42, and is drawn out from the feeding port 36 at the tip of the inner cylinder 26 of the round cord forming tool 12 by the guide roll 46. The round string L is wound around it, inverted, and guided to the position of the feed dog 42.

When the circular string sewing machine having the above-described configuration is used, the circular string L drawn out from the circular string forming tool 12 is inverted by the guide roll 46 and is pressed by the feed dog 42 and the presser foot 44. Since the feed dog 42 that is interlocked with the movement of the needle 6 is always pulled in the direction of the arrow at a constant transfer speed that is synchronized with the suturing speed of the needle 6, the stitch size is constant.

The circular string sewing machine of the present invention has the above-mentioned configuration, but the scope of the present invention is not limited by the above description and the contents of the drawings, and various modifications can be made without departing from the scope of the invention. Examples may be included. For example, as a guide tool for inverting the round string and guiding it to the position of the feed dog, a U-shaped tube is used instead of the roller as in the above-mentioned embodiment, and the round string is passed through the tube from the position of the round string forming tool. The round cord may be guided to the position of the feed dog. This sewing machine for sewing a round cord may be newly manufactured as a dedicated machine, but the needle plate, feed dog, and presser foot of the conventional lockstitch sewing machine may be partially modified. By attaching the round cord forming tool and the guide tool, it can be manufactured relatively easily.

[Effect of device]

Since the present invention is constructed and operates as described above, when the circular string is sewn using the circular string sewing machine according to the present invention, the string is automatically transferred without manual labor. Therefore, it is possible to eliminate the burden on the operator, which has been conventionally required when sewing a round string. Also,
Since the string can be always transferred at a constant speed, the stitches of the round string are uniformly aligned, the sewn round string looks good, and the quality of the round string is constant.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of a sewing machine for sewing a round cord according to an embodiment of the present invention, FIG. 2 is a perspective view of an essential part of a sewing machine for sewing a conventional circular cord, and FIG. Fig. 4 is a perspective view of a round string forming tool used in a sewing machine, Fig. 4 is a view seen from an arrow direction in Fig. 3, and Fig. 5 is a plan view of the round string forming tool.
Each of the figures is a longitudinal sectional view taken along the line VI-VI and a longitudinal section taken along the line VII-VII of FIG. 5 in a sewing state, and FIG. FIG. 2 ... Sewing bed, 6 ... Needle, 12 ... Circular cord forming tool, 14
...... Circular cord forming tube, 16 …… Mounting plate, 24 …… Outer cylinder, 26 ……
Inner cylinder, 32 ... Inner cylinder insertion port, 40 ... Needle plate, 42 ... Feed dog, 44 ... Presser foot, 46 ... Guide roller, T ... Tape string, S ... Sewing part, S '... seam allowance part, L ... round string.

Claims (1)

[Scope of utility model registration request] 1. An outer cylinder for guiding a continuous tape-shaped cord in an annular shape in the width direction while overlapping both side edge portions along the transfer direction with each other, and an inner side of the outer cylinder and an insertion port. Is provided so as to be located on the rear side in the transfer direction from the needle drop position, and the two sides of the tape-shaped cord formed into an annular shape by the outer cylinder are sewn linearly along the transfer direction to form a tubular shape. A needle string of a sewing machine bed having a circular cord forming tool having an inner cylinder that reverses the sewn portion formed on the upper end and repeats the front and back sides to end the seam allowance portion of the sewn portion inside the cylinder of the sewn portion. In a sewing machine for sewing a round cord, which is attached to the needle plate, at a distance from the round cord forming tool,
A feed dog that is interlocked with the movement of the needle is installed in parallel, and a presser foot is arranged above the feed dog so that it can be brought into contact with and separated from it, and the circular cord formed by the circular cord forming tool is reversed on the upper surface of the sewing machine bed. A sewing machine for sewing a round cord, wherein a guide tool for guiding the feed dog to the position is provided.