KR20080107586A - Stitch skip equipment of chain stitch sewing machine - Google Patents

Abstract

A stitch skip apparatus of a round rod sewing machine is provided to perform easily operation of inserting looper thread because the operation of inserting looper thread is performed to the looper at a state of maintaining and fixing upper support block to the lower state when workers insert the looper thread. A round rod sewing machine contains a looper(110), a retainer looper part and a looper holding unit. The looper captures a loop of the sewing thread from a sewing needle moved upward and downward by an oscillation of a direction parallel to a cloth transferred direction, and inserts and penetrates the looper thread. The retainer looper part captures the looper thread from an end part of a knife of the looper and contains a retainer looper pin forming the loop. The looper holding unit controls support of the looper and an amount of wobbling. A stitch skip apparatus of the round rod sewing machine contains an upper support block(120), an actuator(130) and a lower support block(140).

Description

Stitch skip equipment of chain stitch sewing machine

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a case of forming a sewing stitch and a skipping stitch on a jeans.

Fig. 2 is a schematic view showing an enlarged cut portion of a piece of belt cloth and a view showing a state in which the cut portion is sewn;

Figure 3 is a perspective view showing a conventional round sewing machine.

Figure 4 is a perspective view of the main portion showing a sewing sweat skip device of the conventional round bar sewing machine.

5 is a view showing the motion trajectory of the looper of the conventional round sewing machine.

6 is a view showing the looper of the conventional round sewing machine.

Figure 7 is an exploded perspective view showing a sewing stitch skip device of a round bar sewing machine according to a preferred embodiment of the present invention.

8 is a state of use of the sewing stitch skip device of the round bar sewing machine according to a preferred embodiment of the present invention.

9 is a state of use of the sewing stitch skip device of the round bar sewing machine according to another embodiment of the present invention.

   <Description of Symbols for Main Parts of Drawings>

110: looper 111: insertion portion

120: upper support block 121: guide hole

122: intermittent hole 130: actuator

131: body 132: cylinder

133: intermittent bar 135: intermittent nut

140: lower support block 141: fixing hole

142: mounting groove 143: fixing part

144: fixing groove 145: fixture

146: set screw 147: swinging shaft

150: guide rod 151: spring

160: intermittent bolt 161: fixed rod

162: intermittent part 163: auxiliary spring

170: retainer looper portion 171: retainer looper pin

173: axis of motion 180: needle bar

181: needle support 182: sewing needle

The present invention relates to a round bar sewing machine, and more particularly, by changing the height of the looper of the round bar sewing machine to prevent thread stitching with a needle, so that the sewing sweat is not formed reliably. It is about.

In general, the round bar sewing machine is used to seal the waist belt of the jeans (jeans) shown in Fig. 1 (A), where the waist belt (W) is the circumference of the upper body of the jeans (J) It is a strip-shaped cloth sealed to the portion of, and as shown in Fig. 1 (B), parallel sewing is performed on each of the upper and lower portions by using at least two sewing needles.

In order to efficiently produce jeans, the following process is performed for efficient production. As shown in (B) of FIG. 1, a length cloth is formed in the opening of the long piece of waist belt cloth 10 having a substantially U-shaped cross section. The end of the piece 11 is inserted, and each piece of cloth cloth 11 and the waist belt cloth piece 10 are sealed only a predetermined distance A, and then the predetermined distance B is skipped without sewing stitches. After making the part (unsealed part), it is continuously sealed with an intermittent sewing, which once again seals only a predetermined distance (A).

Then, in order to prepare a piece of cloth pieces from the cloth pieces (10, 11) to be sealed, a predetermined position C, C of the waist belt cloth pieces (10) are cut, and the waist belt cloth pieces (10) are cut. As shown in Fig. 2, the cut end face 10a of Fig. 2) is sandwiched in the direction indicated by the arrow D, the end portion to be sandwiched is sealed and cross-sectional treatment is performed.

If such a process, a large number of pieces of cloth cloth and waist belt cloth can be sealed quickly can finally improve the production efficiency and work efficiency significantly.

Here, the sewing portion between the cloth fabric piece 11 and the waist belt fabric piece 100 as described above is sealed after cross-sectioning the cut end 10a of the waist belt cloth piece 10, wherein, Compared to the case where the cloth cloth piece 11 and the waist belt cloth piece 10 were continuously sealed without making a sewing stitch skipping portion, the cut piece 10a of the waist belt cloth piece 10 was located near the cut section 10a. Since the sewing stitches do not need to be loosened again, work efficiency can be greatly improved.

As an intermittent sewing means as described above, in which the worker intentionally makes a part of the sewing sweat skipping, referring to Japanese Patent Application Laid-Open No. 2007-29151, which is a conventionally disclosed round bar sewing machine, with reference to FIGS. 3 to 6, a sewing needle ( A needle bar 14 having a needle holder 13 to which the 12 is mounted and fixed; An up / down moving mechanism (not shown) for moving the needle bar 14 up and down; A looper which is swung along the conveying direction (X-axis direction) of the sewing material and separately penetrates the looper thread L with respect to a loop of the sewing thread T of the sewing needle 12 to form sewing stitches ( looper: 15); A looper holding mechanism 20 for adjusting the amount of swing of the looper 15; A rocking mechanism (not shown) for rocking the looper 15 using the looper holding mechanism 20; Retainer looper pins 31 are provided as sharp protrusions which move in a direction crossing the trajectory of the knife tip 15a with respect to the looper 15 and capture the looper seal L and at the same time form a loop. A retainer looper portion 70; A reciprocating mechanism (not shown) for reciprocating the retainer looper portion 70 along the Y-axis direction; It is comprised by the main body frame 50 which supports each said structure.

Here, the retainer looper part 70 is provided with a cover 75 to prevent sewing stitches from being formed by preventing the threading of the retainer looper part 70 and the looper 15 when sewing the to-be-sealed material. The cover 75 has a plate-shaped thread preventing protrusion 74 formed at a side surface of the cover 75 in a position to shield the retainer looper pin 71 at a skip section during a sewing operation. Is moved so that the stitching of the looper 15 and the retainer looper pins 71 are prevented from forming by sewing stitches.

In the sewing stitch skip device of the conventional round bar sewing machine having the configuration as described above, when the cover 75 is moved, the retainer looper portion 70 is used as a guide member to reciprocate linearly, and the cover 75 and the retainer loop If the parts of the fur part 70 is not precise, smooth movement is not made and the sewing stitch skipping operation is not performed smoothly, or the thread loop preventing protrusion 74 and the retainer looper pin during the operation of the cover 75 are not performed. There was a problem that noise was generated due to the collision and friction between the 71.

In addition, when the lower thread sewing operation for penetrating the looper thread (L) to the looper 15, there are many problems that the looper 15 is only a swinging motion of a predetermined angle in the cloth feed direction is difficult.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to form a looper in the vertical direction by using an actuator to move up and down, the looper at the optimum position for forming sewing stitch It is to provide a device for skipping the sewing stitch of the round bar sewing machine to prevent the formation of the sewing stitch by preventing the thread binding with the retainer looper by leaving and returning.

Therefore, the sewing stitch skip device of the round bar sewing machine according to an embodiment of the present invention for achieving the above object, the loop of the sewing thread from the sewing needle to move up / down to the swinging motion in a direction parallel to the cloth feed direction A looper for picking up with the tip of the knife and inserting the looper thread therethrough; A retainer looper portion provided with a retainer looper pin for capturing the looper thread from the tip of the looper and performing loop formation; In the round bar sewing machine provided with a looper holding mechanism for adjusting the support and swing amount of the looper, the upper support block is fixed to the looper; An actuator providing a driving force for displacing the upper support block; And a lower support block to which one side of the actuator is mounted, and the other side to which a rocking shaft is connected to provide a driving force for rocking the looper in a direction parallel to the cloth conveying direction.

In a preferred embodiment, it is displaced in the vertical direction by using the driving force of the actuator.

In addition, it is preferable that the upper support block is rotationally driven in the transfer direction using the driving force of the actuator.

In addition, it is preferable that the said actuator is a pneumatic cylinder.

On the other hand, the space between the upper support block and the lower support block in the spaced apart between the guide rods for guiding it in the vertical movement of the upper support block; preferably further comprises a.

In a preferred embodiment, the spring is installed on the outer circumferential portion of the guide rod to absorb the shock due to the downward movement of the upper support block using a predetermined elastic force in the spaced space between the upper support block and the lower support block It further includes;

Here, it is preferable that one side of the intermittent rod inserted into the cylinder passes through the upper support block, and a screw portion is formed on the outer circumferential surface of the intermittent rod, and screwed with the intermittent nut provided on the upper side of the upper support block.

In addition, one side penetrates the upper support block and is fixed to the fixing part of the lower support block, and the other side protrudes above the upper support block, and an intermittent bolt for controlling separation of the upper support block is further provided. desirable.

In addition, the intermittent bolt, the fixing rod is formed in a cylindrical shape through the intermittent hole of the upper support block and one end is inserted into the fixing groove of the fixing part is fixed by the fixing screw; It is preferably configured to be formed of a disc of a predetermined thickness formed larger than the cross-sectional area of the fixed rod to control the separation of the upper support block in the upward direction.

On the other hand, the spring is installed on the fixing rod outer peripheral portion of the intermittent bolt for supporting the downward movement force of the upper support block using a predetermined elastic force in the spaced between the intermittent portion and the upper support block; It is desirable to.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. 7 is an exploded perspective view showing a sewing stitch skip device of the round bar sewing machine according to a preferred embodiment of the present invention, Figure 8 is a state diagram of the sewing stitch skip device of the round bar sewing machine according to a preferred embodiment of the present invention.

As shown in the figure, the sewing stitch skip device of the round bar sewing machine to prevent the sewing thread to skip the sewing stitch when sewing the looper 110, the upper support block 120, the actuator 130, the lower support Block 140, guide rod 150, intermittent bolt 160 is made.

The looper 110 is formed in the shape of a hook having a sharp insertion portion 111 in front, and participates in threading together with the retainer looper pin 171. Here, the retainer looper pin 171 is formed to protrude from the side portion of the retainer looper portion 170 provided at the end of the movement shaft 173 of the sewing machine.

The upper support block 120 is formed so that the plurality of guide holes 121 penetrates in one vertical portion in the vertical direction, and the intermittent holes 122 penetrate in the vertical direction in the other portion.

The actuator 130 is preferably provided with a pneumatic cylinder, the body portion 131, a cylindrical cylinder 132 inserted into the body portion 131, and a cylindrical shape inserted into the cylinder 132 It is comprised by the control rod 133. Here, the upper end of the cylinder 132 is in surface contact with the lower end of the upper support block 120, the intermittent rod 133 is penetrated through the upper support block 120, one side is the upper support block Protrudes on the upper side of the 120 is coupled to the intermittent nut 135. Thus, the upward release of the upper support block 120 is interrupted by the intermittent nut 135, and the lower part of the upper support block 120 is supported by the cylinder 132. On the other hand, in another embodiment, a threaded portion (not shown) is formed on the inner surface of the cylinder 132, the threaded portion is formed on the other side of the intermittent rod 133, screwed to the threaded portion of the cylinder 132 It is desirable to.

The lower support block 140 has a plurality of mounting grooves 142 formed on the other side, and the fixing portion 145 having the fixing groove 144 formed thereon protrudes. Here, the fixing part 145 is formed with a fastener 145 formed on the inner peripheral surface of the screw portion, the fixing screw 146 is screwed to the fixing tool 145. In addition, the fixing hole 141 penetrated to the side portion is formed is coupled to the swing shaft 147 of the sewing machine.

The guide rod 150 is provided in plurality, the lower end is inserted into the mounting groove 142 of the lower support block 140, the upper end is inserted into the guide hole 121 of the upper support block 120 On the outer circumferential portion of the guide rod 150, a spring 151 is inserted into the space between the upper support block 120 and the lower support block 140.

The spring 151 installed on the outer circumferential portion of the guide rod 150 has an upper support block 120 when the looper 110 moves up and down in a space spaced between the upper support block 120 and the lower support block 140. ) To absorb shocks caused by downward movement.

The intermittent bolt 160 is provided with a fixed rod 161 having a cylindrical shape on one side thereof, and a disc-shaped intermittent portion 162 having a predetermined thickness formed larger than the cross-sectional area of the fixed rod 161. . Here, one end of the fixing rod 161 is inserted into the fixing groove 144 of the fixing part 143 by penetrating the intermittent hole 122 of the upper support block 120 by the fixing screw 146. It is fixed. In addition, the intermittent part 162 is provided on the upper side of the upper support block 120 to interrupt the upward departure of the upper support block 120.

As shown in FIG. 9, on the outer circumferential portion of the fixing rod 161 of the intermittent bolt 160, the upper support block (B) is formed by using a predetermined elastic force between the intermittent portion 162 and the upper surface portion of the upper support block 120. An auxiliary spring 163 for assisting the downward movement force of 120 is further installed.

Referring to the operation of the sewing stitch skip device of the round bar sewing machine according to a preferred embodiment of the present invention configured as described above, the looper 110 together with the retainer looper pin 171 when sewing the sewing to the sewing material The upper support block 120 is moved downward as the cylinder 132 of the actuator 130 moves downward in the sewing stitch skip section, which forms a sweat but does not need sewing stitch.

Thus, the looper 110 fixed to the upper support block 120 is located in the lower direction of the retainer looper pin 171 that is difficult to engage in threading. Accordingly, the looper 110 is unable to participate in threading with the retainer looper pin 171, so that the sewing stitch formation is stopped.

On the other hand, in the section in which sewing stitch formation is required, the cylinder 132 of the actuator 130 is moved upward, and the upper support block 120 is moved upward so that the looper 110 is also moved upward. The retainer looper pin 171 is located at a height capable of threading. Accordingly, the looper 110 is involved in weaving and sewing stitches are formed in the material to be sealed.

In the exemplary embodiment of the present invention, only the case in which the upper support block 120 is moved in the up / down direction by using the pneumatic cylinder is not limited thereto. In another embodiment, the actuator ( 130 may rotate the upper support block 120 in the cloth feed direction using a linear motor such as a linear motor.

As described above, specific embodiments of the present invention have been described in detail. However, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined not only by the claims below, but also by those equivalent to the claims.

As described above, the sewing stitch skip device of the round bar sewing machine of the present invention has the effect of preventing the occurrence of noise due to collision and friction between the parts during operation by changing the height of the looper when sewing to skip the sewing stitch.

In addition, it is provided with a structure for changing the height of the looper has an effect of preventing the vibration caused by the left / right movement generated when using the cover in the conventional retainer looper.

In addition, the looper yarn threading work is carried out to the looper in a state that the upper supportable force is maintained in a lowered state when the threader threading work of the worker is fixed in the lowered state has an effect that can be easily performed.

Claims (10)

A looper for capturing a loop of the sewing thread from the sewing needle which is moved up and down by a swinging tip in a direction parallel to the cloth feeding direction and inserting the looper thread through the looper thread; A retainer looper portion provided with a retainer looper pin for capturing the looper thread from the tip of the looper and performing loop formation; In the round bar sewing machine provided with a looper holding mechanism for adjusting the support and swing amount of the looper, An upper support block to which the looper is fixed; An actuator providing a driving force for displacing the upper support block; And The actuator is mounted on one side, and the lower side of the lower support block is connected to a rocking shaft for providing a driving force for rocking the looper in a direction parallel to the cloth feed direction. Sweat skip device. The method of claim 1, wherein the upper support block, Sewing stitch skip device of the round bar sewing machine, characterized in that the displacement in the vertical direction by using the driving force of the actuator. The method of claim 1, wherein the upper support block, Sewing stitch skip device of the round bar sewing machine, characterized in that the rotational drive in the direction of the cloth transfer using the driving force of the actuator. The method of claim 1, wherein the actuator, Sewing stitch skip device of a round bar sewing machine characterized in that the pneumatic cylinder. The method of claim 1, The sewing rod skip device of the round bar sewing machine, characterized in that it further comprises; a guide rod for guiding it in the vertical movement of the upper support block in the space spaced between the upper support block and the lower support block. The method of claim 5, wherein A spring installed on an outer circumferential portion of the guide rod to absorb an impact caused by the downward movement of the upper support block by using a predetermined elastic force in a space spaced between the upper support block and the lower support block; Sewing stitch skip device of the round bar sewing machine characterized in that. The method of claim 4, wherein One side of the intermittent rod inserted into the cylinder penetrates the upper support block, and a threaded portion is formed on the outer circumferential surface of the intermittent rod, and is screwed with the intermittent nut provided on the upper side of the upper support block. Sewing stitch skip device. The method of claim 1, One side penetrates the upper support block and is fixed to the fixing part of the lower support block, and the other side protrudes above the upper support block, and an intermittent bolt for controlling the separation of the upper support block is further provided. Stitching skip device of round bar sewing machine made. The method of claim 8, wherein the intermittent bolt, A fixing rod formed in a cylindrical shape and having one end inserted into the fixing groove of the fixing portion through the intermittent hole of the upper support block and fixed by the fixing screw; It is formed in a disc of a predetermined thickness formed larger than the cross-sectional area of the fixed rod is intermittent to control the separation of the upper support block in the upward direction; skip sewing machine of the round bar sewing machine, characterized in that consisting of. The method of claim 9, An auxiliary spring installed on an outer circumferential part of the intermittent bolt to assist the downward movement force of the upper support block by using a predetermined elastic force in a space spaced between the intermittent part and the upper support block; Sewing stitch skip device of the round bar sewing machine characterized in that.

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