JP2008220651A - Feeder of cylindrical sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a feeder of a cylindrical sewing machine preventing the catching of cloth into a rear roller and reducing damage of an endless belt. <P>SOLUTION: This feeder of the cylindrical sewing machine includes a needle plate disposed on the upper face of a cylindrical bed and having a needle plate claw, the rear roller disposed along the upper face of the cylindrical bed in the rear part of the needle plate claw and paired with a front roller disposed in front of the needle plate claw, the endless belt wound around the front roller and the rear roller and having its one part disposed on the needle plate, and an intermittent clutch connected to one of the front roller or the rear roller and applying the intermittent rotation to the roller operatively in association with the rotation of a main shaft; and carries the cloth placed on the needle plate in the cloth feeding direction by the endless belt. This feeder is further provided with guide pieces disposed on the rear roller in the both sides of the endless belt and having support faces, and a part of the support face is overhung from the endless belt on the rear roller in the cloth feeding direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cylindrical sewing machine feeding device that can be applied when sewing cuffs of baby wear.

  As a conventional cylindrical sewing machine feeding device, a sewing machine feeding device is known which feeds a fabric with an endless belt arranged on a cylindrical bed (see, for example, Patent Document 1). This feeding device includes a needle plate disposed on the upper surface of the cylindrical bed and having a needle plate claw, a rear roller disposed behind the needle plate claw and along the bed upper surface, and a portion of the needle wound around the rear roller. An endless belt disposed on the plate is provided.

Japanese Patent Laying-Open No. 2004-222948 (5th page, FIG. 1-3)

However, even in the conventional cylindrical sewing machine feeder, when the diameter of the round fabric is small, the round fabric is likely to be caught between the rear roller and the endless belt, and the round fabric is damaged. . Further, when the circumference of the endless belt is increased due to the winding of the round fabric, the tension of the endless belt is increased and the endless belt may be torn off.
Therefore, an object of the present invention is to provide a feeding device for a cylindrical sewing machine that prevents the fabric from being caught in the rear roller and reduces the breakage of the endless belt.

  In order to achieve the above object, the present invention provides a needle plate having a needle plate claw disposed on the upper surface of the cylindrical bed, and a needle plate claw disposed behind the needle plate nail and along the upper surface of the cylindrical bed. A rear roller that makes a pair with the front roller, an endless belt that is wound around the front roller and the rear roller, and a part of which is disposed on the needle plate, and is connected to one of the front roller or the rear roller and interlocked with the rotation of the main shaft An intermittent clutch that applies intermittent rotation to the roller, and is a cylindrical sewing machine that conveys the cloth placed on the needle plate in the cloth feeding direction by the endless belt. A guide piece having a support surface arranged on the side is provided, and a part of the support surface protrudes from the endless belt on the rear roller in the cloth feeding direction.

  It is desirable that endless belts are arranged side by side across the needle plate claw, and the support surface of the guide piece interposed between the left and right endless belts of the guide pieces is adjacent to the rear portion of the needle plate, and the front roller is cylindrical. The rear roller may be pivotally supported on a fixed base so that the front and rear positions of the rear roller can be adjusted to the bracket.

  According to the present invention, it is provided with the guide pieces that are disposed on both sides of the endless belt behind the needle plate claw and have support surfaces, and a part of the support surface is protruded from the endless belt on the rear roller in the cloth feeding direction. Therefore, the fabric on the rear roller is separated from the endless belt, and the fabric is prevented from being caught between the rear roller and the endless belt. In addition, the increase in tension of the endless belt can be prevented by preventing the fabric from being caught in the rear roller, and the breakage of the endless belt can be reduced. In addition, when endless belts are arranged side by side across the needle plate claws, and the support surface of the guide piece interposed between the left and right endless belts among the guide pieces is adjacent to the rear part of the needle plate, when the fabric is conveyed by the endless belt It is possible to prevent the fabric from falling between the needle plate and the rear roller, and to reduce the fabric winding between the rear roller and the endless belt. Furthermore, if the front roller is pivotally supported by a bracket that can be attached to and detached from the cylindrical bed, and the rear roller is pivotally supported by a fixed pedestal so that the front and rear positions can be adjusted, the tension of the endless belt wound around both rollers can be adjusted appropriately The fabric wrapping between the rear roller and the endless belt can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The cylindrical bed 1 protrudes from the bed base B of the sewing machine, and the needle plate 3 disposed on the upper surface of the cylindrical bed 1 is below the presser foot 5 supported at the tip of the sewing machine arm A. The needle plate claw 3a of the needle plate 3 extends in the cloth feeding direction F as shown in FIG. 2, and the needle 2 arranged at the tip of the sewing machine arm intermittently penetrates the periphery of the base portion of the needle plate claw 3a. As shown in FIG. 3, the needle plate 3 is fixed to a mounting member 7 a of the bracket 7 with screws 6. As shown in FIG. 4, the bracket 7 is detachably fixed to the cylindrical bed 1 by a pin 7b and a protruding piece 7c attached to the base end side. The front end of the bracket 7 has a pair of front shaft support portions 7d and 7d, and the front roller 8 is supported by the front shaft support portions 7d and 7d via the front support shaft 8a. The front roller 8 has a cylindrical shape, and the front support shaft 8a is fixed to the front roller 8 with screws 8b. The front roller 8 is disposed along the upper surface of the cylindrical bed 1 before the needle plate claw 3a, and both ends of the front roller 8 have small-diameter tooth portions 8c and 8c.

  The base 7e at the rear end of the bracket 7 has a pair of rear shaft support portions 7f and 7f, and the rear roller 9 which makes a pair with the front roller 8 is supported by the rear shaft support portions 7f and 7f via the rear support shaft 9a. . The rear roller 9 has a cylindrical shape, and the rear support shaft 9a is fixed to the rear roller 9 with screws 9b. The rear roller 9 is disposed along the upper surface of the cylindrical bed 1 behind the needle plate claw 3a, and both end portions of the rear roller 9 have small-diameter grooves 9c, 9c. The base 7e has a lower piece 7g, and the worm screw 10 is accumulated on the lower piece 7g. The lower piece 7g of the pedestal 7e is fitted in the recess 7h of the bracket 7 so as to be slidable back and forth. When the pestle screw 10 is rotated while the pedestal 7e fixing screw 11 is loosened, the pedestal 7e is rotated in the recess 7h of the bracket 7 as shown in FIG. Slide in the direction of arrow X along the feed direction F. Thereby, the base 7e can be adjusted with respect to the bracket 7, and the tension | tensile_strength of the endless belts 13 and 13 can be changed. The worm screw 10 is fixed to the pedestal 7e with a nut 12.

  The endless belts 13 and 13 are wound around the tooth portions 8 c at both ends of the front roller 8 and the groove portions 9 c of the rear roller 9, and part of them pass through the groove portions 3 b and 3 b on the needle plate 3. The depth of the groove 9c of the rear roller 9 is made to substantially coincide with the thickness of the endless belts 13, 13. By passing the endless belts 13 and 13 over the groove 3 b of the needle plate 3, the transport surface height of the endless belts 13 and 13 is brought close to the upper surface height of the needle plate 3. 13 a is slightly higher than the upper surface of the needle plate 3. The endless belts 13 and 13 are arranged side by side on both sides of the throat plate claw 3a, and the central portions of the front roller 8 and the rear roller 9 also serve as a cloth conveying surface. In particular, when the central portion of the front roller 8 is a flat roller, the fluff of the fabric is not caught or wound around the front roller 8. An intermittent clutch 14 is connected to the front support shaft 8 a of the front roller 8. The intermittent clutch 14 intermittently rotates the front support shaft 8a in one direction in conjunction with the rotation of the main shaft (not shown), and the intermittent rotation of the front support shaft 8a is transmitted to the endless belts 13 and 13.

  The presser foot 5 presses the fabric toward the needle plate 3, and the fabric placed on the needle plate 3 is conveyed in the fabric feeding direction F by the endless belts 13 and 13 when the main shaft rotates. The groove 9c of the rear roller 9 is not formed in a tooth shape, and the movement of the endless belts 13 and 13 is difficult to be transmitted to the rear roller 9. As a result, the endless belts 13 and 13 can slide on the grooves 9c and 9c of the rear roller 9 even when the fabric enters the gap between the rear roller 9 and the rear shaft support portions 7f and 7f when the main shaft rotates and the rear roller 9 does not move.

  Guide pieces 15 and 16 are arranged on both sides of the endless belts 13 and 13 on the rear roller 9. As shown in FIG. 6, the guide piece 15 is extended to the rear shaft support portions 7 f and 7 f of the pedestal 7 e, and the guide piece 16 is fixed to the pedestal 7 e with a nut 12 accumulated on the worm screw 10. The guide pieces 15 and 16 have support surfaces 15a and 16a, and the support surfaces 15a and 16a are located behind the throat plate claw 3a. The support surfaces 15a and 16a are positioned lower than the endless belt conveyance surface 13a on the needle plate, and the support surface 15a and the upper surface of the needle plate 3 are flush with each other. When the nut 12 is relaxed, the guide piece 16 can be adjusted up and down within the range of the long hole 16e so that the support surface 16a of the guide piece 16 can be flush with the upper surface of the needle plate 3. The support surfaces 15a and 16a straddle the rear roller 9 along the cloth feeding direction F, and a part of the support surfaces 15a and 16a protrudes from the endless belts 13 and 13 spanning the groove 9c of the rear roller 9 in the cloth feeding direction F. The protruding support surfaces 15 a and 16 a separate the fabric from the endless belts 13 and 13 so that the fabric is not caught between the rear roller 9 and the endless belts 13 and 13.

  Further, the arc surfaces 15b and 16b connected to the support surfaces 15a and 16a have the same shape, and in particular, the cloth is guided to the arc surface 16b so as not to be caught by the nut 12 or the insect screw 10. The end portion of the support surface 16 a between the endless belts 13 and 13 is adjacent to the rear portion of the needle plate 3. This prevents the fabric from falling between the throat plate 3 and the rear roller 9 when the fabric is conveyed by the endless belts 13 and 13. In the present embodiment, the intermittent clutch is connected to the front support shaft of the front roller, but the present invention is not limited to this. For example, the rear roller may be connected to the rear support shaft. In this case, the groove portion of the rear roller needs to be formed in a tooth shape, and the tooth portion of the front roller is changed to the groove portion. desirable.

1 is an overall side view of a sewing machine to which an apparatus according to the present invention is applied. It is the perspective view which showed the feeder of the sewing machine which concerns on this invention. It is the components expanded view which showed the attachment structure of the bracket of the apparatus. It is a perspective view which shows the removal state of the principal part of the apparatus. It is a fragmentary sectional view explaining the endless belt winding part of the apparatus. It is the perspective view which showed the guide piece of the apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical bed 3 Needle plate 3a Needle plate nail 7 Bracket 7e Base 8 Front roller 9 Rear roller 10 Bug screw 13 Endless belt 14 Intermittent clutches 15 and 16 Guide pieces 15a and 16a Support surface

Claims (3)

A needle plate disposed on the upper surface of the cylindrical bed and having a needle plate nail; a rear roller disposed behind the needle plate nail along the upper surface of the cylindrical bed and paired with a front roller in front of the needle plate nail; and a front roller And an endless belt wound around the rear roller and partially disposed on the needle plate, and an intermittent clutch connected to one of the front roller or the rear roller and imparting intermittent rotation to the roller in conjunction with the rotation of the main shaft. In a cylindrical sewing machine feeding device that conveys the cloth placed on the needle plate in the cloth feeding direction by an endless belt,
A guide piece disposed on both sides of the endless belt on the rear roller and having a support surface;
A cylindrical sewing machine feeding device, wherein a part of a support surface protrudes from the endless belt on the rear roller in the cloth feeding direction.   The cylindrical sewing machine according to claim 1, wherein endless belts are juxtaposed on the left and right sides of the needle plate claw, and a support surface of the guide piece interposed between the left and right endless belts of the guide pieces is adjacent to the rear portion of the needle plate. Feeding device.   3. A feeding device for a cylindrical sewing machine according to claim 1, wherein the front roller is pivotally supported by a bracket fixed to the cylindrical bed, and the rear roller is pivotally supported by a fixed base so that the front and rear positions of the bracket can be adjusted. .

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