JP4844846B2 - Female drive unit for feeding arm type flat stitch sewing machine - Google Patents

Description

  The present invention relates to a knife driving device that reciprocates a movable knife provided on a cloth presser foot in a direction crossing the cloth feeding direction by transmission from the inside of a sewing machine frame.

  For example, a delivery arm-type flat stitch sewing machine used for stitching of crotch parts of briefs and shorts is provided with a sewing arm and a sewing bed extending in different directions on the upper and lower parts of the sewing machine frame (see, for example, Patent Document 1). ). A head part is connected to the tip of the sewing machine arm in a direction substantially orthogonal to the sewing machine arm, and a plurality of needle bars and presser bars are hung from the head part toward the tip of the sewing machine bed. Needle and presser foot are attached respectively.

  The stitching with the feeding arm-shaped flat stitch sewing machine consists of the presser foot and sewing machine bed attached to the lower end of the presser bar from the base end side of the machine bed, with the edges of the two fabrics to be sewn up and down stacked over a specified width. The sewing machine bed is sewed together by the cooperative movement of multiple needles that move up and down with the needle bar and the looper inside the sewing bed. It is done.

  In order to carry out such stitching well, it is important that the fabric to be sewn is overlaid with an appropriate width corresponding to the parallel width of a plurality of needles. A special presser foot that has a knife mechanism (fixed knife and movable knife) that cuts and aligns the edges of the fabric that is fed to the needle drop position, and feeds the fabric that has been trimmed and aligned by the knife mechanism to the needle drop position. Therefore, a sewing machine that does not require the adjustment of the stacking width by the operator's manual work is used.

  The presser foot includes a pair of presser feet extending in parallel with each other at the front portion of a presser body attached to the lower end of the presser bar. The movable knife and the fixed knife are held so as to face each other of the pair of presser feet. The cloth to be sewn is introduced between a pair of presser feet in a state where the edges on the sewing side are raised and are aligned with each other, and reach the arrangement position of the fixed knife and the movable knife. The movable knife moves back and forth in a direction substantially perpendicular to the direction of feeding of the fabric, slidably contacts the fixed knife, and acts to trim the edge of the fabric that has reached the sliding contact position.

  The movable knife held by the presser reciprocates using a knife swinging shaft provided inside the sewing machine frame as a drive source. The knife swinging shaft is a shaft that repeatedly rotates within a predetermined angle range in accordance with the rotation of the sewing machine main shaft. The movable knife is attached to a knife holder supported so as to be able to turn about the same axis in the middle of the presser bar protruding downward from the head part, and the holding part of the presser foot is used as a guide by repeatedly turning the knife holder. It is designed to reciprocate.

As shown in FIG. 1 of Patent Document 1, the female holder includes a U-shaped swinging arm that extends around the front surface of the head portion and extends inside the head portion. The swing arm is connected to the knife swinging shaft via a connecting rod, and repetitive rotation of the knife swinging shaft inside the sewing machine frame is transmitted to the knife holder via the swinging arm so as to reciprocate the movable knife. It is composed of transmission.
Japanese Patent Publication No. 7-57272

  Now, in many industrial sewing machines, it is desired to increase the operation speed in order to improve the efficiency of sewing work. In order to realize high speed, it is necessary to lubricate various mechanisms provided in the inside of the sewing machine frame with lubricating grease or oil.

  However, in the delivery arm type flat stitch sewing machine configured as described above, an opening for receiving the swinging arm is provided on the front surface of the head portion, and the opening is formed without inhibiting the swinging of the swinging arm. Since it is difficult to seal, it is not possible to satisfactorily perform lubrication of the mechanism provided in the head unit, such as a needle bar drive mechanism for moving the needle up and down, and the factor that hinders the increase in operating speed It has become.

The present invention has been made in view of such circumstances, and the transmission from the knife swinging shaft inside the sewing machine frame to the movable knife provided on the presser and the transmission to the decorative yarn mechanism impairs the sealing inside and outside the head portion. It is an object of the present invention to provide a female driving device for a feed-out arm-shaped flat stitch sewing machine that can be realized without any problems, facilitates lubrication of the mechanism in the head portion, and does not hinder an increase in operating speed.

A female drive device for a feed arm flat stitch sewing machine according to the present invention is attached to a presser bar supported so as to be movable up and down in a head part at a tip of a sewing machine frame, and a lower end of the presser bar extending outwardly from the head part. A presser foot, a movable knife held by the presser, and a reciprocating rotation of a knife swinging shaft inside the sewing machine frame are transmitted to the movable knife, and the movable knife is crossed with the feed direction of the fabric pressed by the presser foot. In a female drive device for a feeding arm-type flat stitch sewing machine comprising a transmission mechanism that reciprocates in the direction of movement and a decorative thread mechanism that arranges decorative threads on the upper surface of the fabric, the transmission mechanism moves up and down the lower wall of the head portion. A support cylinder that penetrates in the direction and is fixed to the lower wall, a transmission cylinder that is fitted into the support cylinder and is supported by the support cylinder so as to be capable of repetitive rotation around an axis, and an internal fit in the transmission cylinder And axial rotation Rotates with supported as allow for the presser bar is inserted, a supporting bush for supporting the lower portion of the presser rods, the upper end portion radially outwardly of said transmission cylindrical projecting outwardly of the head portion A swinging arm that is connected to the knife swinging shaft, an attachment portion for the movable knife provided at a lower end portion of the transmission cylinder that protrudes outside the head portion, and a lower outer side of the head portion. A lower end portion of the support bush protruding to the upper end portion of the support bush protruding to the inside of the head portion, and a bracket for connecting a decorative yarn mechanism that connects to a decorative yarn mechanism provided in the vicinity of the presser foot Oscillating brackets that repeatedly rotate the support bush about the axis by transmission, and a fitting portion between the transmission tube and the support bush and a fitting portion between the transmission tube and the support tube, respectively. Annular seal And interposed, characterized in that the inside and outside of the head portion are sealed liquid-tightly.

In the present invention, the lower wall of the head portion is supported by a support cylinder penetrating in the vertical direction, and a transmission cylinder is provided to hold the support bush of the presser bar. The transmission cylinder is transmitted by transmission from the female swing shaft. A transmission is configured to reciprocately move the movable knife by revolving around the axis, and an oil seal, O is provided in each of the fitting portion between the transmission tube and the support bush, and the fitting portion between the transmission tube and the support tube. The inner and outer sides of the head part are liquid-tightly sealed with an annular seal member such as a ring. Transmission from the female swing shaft to the transmission cylinder is simple by connecting a swing arm to the female swing shaft by projecting a swing arm radially outward from the upper end of the transmission cylinder protruding inside the head section. The movable knife is attached to the lower part of the transmission cylinder projecting to the outside of the head portion, and the repetitive rotation of the knife swinging shaft is transmitted to the movable knife through the transmission cylinder. The support bush is connected to a decorative thread mechanism provided near the presser foot on the lower outer side of the head part via a bracket, and is repeatedly rotated coaxially with the presser bar and the transmission cylinder by transmission to the inner side of the head part. It is used to drive the decorative thread mechanism.

In the knife driving device for a feeding arm-shaped flat stitch sewing machine according to the present invention, the repetitive rotation of the female swing shaft inside the sewing machine frame is transmitted to the transmission cylinder penetrating the lower wall of the head portion, and the transmission cylinder is repeatedly rotated. The movable knife held by the presser is reciprocated, and is transmitted from the swing bracket in the head portion to the support bush that is fitted in the transmission cylinder and supported so as to be rotatable about the axis. Since the decorative yarn mechanism connected to the projecting end of the support bush to the lower outer side of the head portion via the bracket is operated by repeatedly rotating, the fitting portion between the transmission cylinder and the support bush and the support cylinder The inside and outside of the head part can be reliably sealed by the sealing member interposed between the head part and the mechanism inside the head part such as the needle bar drive mechanism is well lubricated by the grease or oil for lubrication enclosed in the head part. Etc. it is possible to meet the speed requirements of operating speed, the present invention provides excellent effects.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. FIG. 1 is a perspective view showing the overall structure of a delivery arm type flat stitch sewing machine provided with a female drive device for a delivery arm type flat stitch sewing machine (hereinafter referred to as the present invention device) according to the present invention.

  As shown in the figure, the delivery arm-shaped flat stitch sewing machine includes a sewing machine arm 10 extending in one direction at the upper part of the sewing machine frame 1 and a narrow cylindrical sewing machine bed 11 extending in a different direction from the sewing machine arm 10 at the lower part of the sewing machine frame 1. I have. A head portion 12 having a hollow rectangular block shape is connected to the tip of the sewing machine arm 10 in a direction substantially orthogonal to the sewing machine arm 10.

  Below the head portion 12, a presser bar 13 is supported in a suspended manner toward the tip of the sewing bed 11 facing each other, and a presser foot 14 is attached to the lower end of the presser bar 13. The presser bar 13 is supported so as to be movable up and down as will be described later. The presser foot 14 is elastically brought into contact with a needle plate 15 installed at the tip of the sewing machine bed 11 by the downward movement of the presser bar 13, and holds a cloth (not shown) between the needle plate 15. The cloth held between the presser foot 14 and the needle plate 15 is fed from the base of the sewing machine bed 11 toward the tip side by the operation of a feeding mechanism (not shown) provided inside the sewing machine bed 11, and this feed is applied. Are stitched together by a plurality of needles (not shown) that move up and down in synchronization with the sewing machine.

  The presser foot 14 is provided with a pair of left and right presser feet 14a, 14a extending toward the base (fabric introduction side) of the sewing machine bed 11, and a fixed knife 16 and a movable knife 17 are attached to these presser feet 14a, 14a. Equipped with a female mechanism.

  In FIG. 1, the base of the fixed knife 16 is shown. The fixed knife 16 is a plate-shaped knife fixedly held by one presser foot 14a, and has a blade at a tip portion protruding between the other presser foot 14a. The movable knife 17 (see FIGS. 2 and 3) is held by the other presser foot 14a and reciprocates in a direction substantially perpendicular to the presser feet 14a and 14a by the operation of the knife driving device configured as described later. Then, in contact with the blade of the fixed knife 16, the edges of the cloth to be introduced are aligned between the presser feet 14a and 14a as is well known. The trimmed fabrics are overlapped in the vertical direction by the action of the guide means located on the downstream side of the knife mechanism, and sent to the needle drop position for sewing.

  A feature of the present invention lies in the configuration of a knife driving device that reciprocates the movable knife 17. FIG. 2 is a perspective view showing the assembled state of the device of the present invention, and FIG. 3 is an exploded perspective view of the same.

  In the figure, 2 is a female swing shaft. The knife swinging shaft 2 is a rotating shaft that is horizontally supported inside the sewing machine arm 10 by support means (not shown), and that repeatedly rotates around the axis within a predetermined angle range by transmission from a sewing machine main shaft (not shown). is there. A swing arm 20 that protrudes radially outward is fixed to one end of the knife swing shaft 2. The swing arm 20 swings in response to repeated rotation of the knife swing shaft 2.

  In the figure, 3 is a transmission cylinder. As shown in FIG. 3, a female bracket 30 protrudes radially outward from one end of the cylindrical transmission cylinder 3 in the axial direction. Such a transmission cylinder 3 is supported by a lower wall 12a (see FIG. 4) of the head portion 12 via a cylindrical support cylinder 4.

  FIG. 4 is a cross-sectional view showing the support structure of the transmission cylinder 3. As shown in the figure, the support cylinder 4 is fixed so as to penetrate the lower wall 12a of the head portion 12 in the vertical direction. The support cylinder 4 can also be configured integrally with the head portion 12. The transmission cylinder 3 is fitted into the support cylinder 4 from the outside of the head portion 12 with the protruding side of the female bracket 30 facing down, and is supported so as to be able to rotate around the axis.

  The upper end portion of the transmission cylinder 3 protrudes to the inside of the head portion 12 by an appropriate length, and a swing bracket 31 is fixed to the protruding portion. The swing bracket 31 has a function of supporting the transmission cylinder 3 by holding the support cylinder 4 between the swing bracket 31 and the female bracket 30 provided at the lower portion of the transmission cylinder 3 so that the support cylinder 4 cannot be pulled out.

  As shown in FIG. 3, a sliding plate 40 is interposed between the lower end surface of the support tube 4 and the female bracket 30 so that the transmission tube 3 can rotate without resistance by the action of the sliding plate 40. It has been. A seal ring 41 is attached to the lower part of the support cylinder 4 so as to be in close contact with the outer periphery of the transmission cylinder 3, and the space between the transmission cylinder 3 and the support cylinder 4 is sealed in a liquid-tight manner.

  As shown in FIGS. 2 and 3, the swing bracket 31 includes a swing arm 32 that protrudes radially outward. The swing arm 32 is connected to the swing arm 20 of the female swing shaft 2 by a connecting rod 5 having ball joints 50 and 50 at both ends. Oscillation is transmitted.

With the above configuration, the transmission cylinder 3 repeatedly rotates around the axis in accordance with the repeated rotation of the female swing shaft 2 transmitted through the swing arm 20, the connecting rod 5, and the swing arm 32. The ball joints 50 and 50 at both ends of the connecting rod 5 absorb the relative position change between the swing arm 20 and the swing arm 32. Further, as shown in FIG. 3, the ball joints 50 and 50 at both ends of the connecting rod 5 are attached so as to be capable of adjusting the position in the axial direction by screws. This position adjustment is performed in order to adjust the axial length of the connecting rod 5 to the actual positions of the swing arm 20 of the female swing shaft 2 and the swing arm 32 of the transmission cylinder 3 when the female drive device is assembled. After the assembly, the position of the ball joints 50 and 50 can be adjusted to change the swinging position of the transmission cylinder 3 and finely adjust the reciprocating range of the movable knife 17 generated as described later.

  As shown in FIG. 3, the female bracket 30 at the lower end of the transmission cylinder 3 includes a fixed seat 33 extending downward, and a movable knife 17 is attached to the fixed seat 33 via a shank base 34. The movable knife 17 is a plate-shaped knife, and is fixed to a knife holder 35 pivotally supported on a shank base 34 so as to be rotatable about a vertical axis as shown in FIGS. It has a blade at the protruding end in the orthogonal direction.

  The movable knife 17 fixed in this way is inserted into the guide portion provided on one presser foot 14a of the presser foot 14, and as described above, is held so as to be able to reciprocate in the direction substantially orthogonal to the presser feet 14a, 14a. Has been. The reciprocating motion of the movable knife 17 is caused by the swing of the knife bracket 30 in response to repeated rotation of the transmission cylinder 3. The knife holder 35 can be rotated with respect to the shank base 31 against the spring force of the coil spring 36 interposed in the pivotal support portion, and by this rotation, the movable knife 17 can be shaken by the swing of the knife bracket 30. It can reciprocate without being affected.

  A cylindrical support bush 6 is fitted inside the transmission cylinder 3 as described above. As shown in FIGS. 2 and 3, a hook bracket 60 protrudes radially outward from one end of the support bush 6 in the axial direction. As shown in FIG. 4, such a support bush 6 is fitted into the transmission cylinder 3 from the outside of the head portion 12 with the protruding side of the hook bracket 60 as the bottom, and is supported so as to be rotatable around the axis. Has been.

  The upper portion of the support bush 6 protrudes from the upper end of the transmission cylinder 3 to the inside of the head portion 12 by an appropriate length, and a swing bracket 61 is fixed to the protrusion. The swing bracket 61 holds the transmission cylinder 3 between the swing bracket 61 and the hook bracket 60 provided at the lower part of the support bush 6 and functions to support the support bush 6 so that the transmission cylinder 3 cannot be pulled out vertically. An oil seal 37 is attached to the lower end portion of the transmission cylinder 3 so as to contact the outer periphery of the support bush 6, and the space between the support bush 6 and the transmission cylinder 3 is sealed in a liquid-tight manner.

  As shown in FIG. 4, a presser bar 13 is inserted into the support bush 6 supported in this manner. The upper part of the presser bar 13 is inserted into the upper bush 7 fixed so as to penetrate the upper wall 12b of the head part 12 in the vertical direction. In this way, the presser bar 13 is supported at both ends by the upper bush 7 and the support bush 6 so as to be vertically moved under the guidance of the bushes 6 and 7. The presser bar 13 is also indicated by a two-dot chain line in FIG.

  An adjustment screw 70 is screwed onto the upper portion of the upper bush 7 protruding outside the head portion 12. A coil spring is used between the lower end portion of the adjustment screw 70 and the upper end portion of the presser bar 13. A presser spring 71 is interposed. The presser spring 71 applies a downward spring force to the presser bar 13 and urges the presser foot 14 attached to the lower end portion of the presser bar 13 downward. In FIG. 4, the presser foot 14 is not shown.

  The magnitude of the spring force of the presser spring 71 can be adjusted by rotating the knob 72 provided at the upper end of the adjusting screw 70 and changing the screwing amount of the adjusting screw 70. This adjustment is performed so as to change the pressing force of the cloth held between the presser foot 14 and the needle plate 15 as described above, and the adjusted pressing force is adjusted by a lock nut 73 provided in the middle of the adjusting screw 70. Can be maintained by tightening. An oil seal 62 is attached to the lower end portion of the support bush 6 so as to come into contact with the outer periphery of the presser bar 13, and the space between the support bush 6 and the presser bar 13 is sealed in a liquid-tight manner.

  The illustrated support bush 6 is configured to repeatedly rotate around an axis by transmission to a swing bracket 61 provided at the upper end. A hook bracket 60 provided at the lower end of the support bush 6 is connected to a decorative thread mechanism 8 (see FIG. 1) provided near the presser foot 14. The decoration thread mechanism 8 operates in accordance with repeated rotation of the support bush 6 and performs a known action of arranging the decoration thread on the upper surface of the fabric being sewn. In this case, as shown in FIG. 4, the support bush 6 can be smoothly rotated repeatedly by inserting a sliding plate 38 between the lower end surface of the transmission cylinder 3 and the hook bracket 60. Become.

  The device of the present invention configured as described above includes a transmission cylinder 3 that is supported by penetrating the lower wall 12a of the head portion 12 in the vertical direction and that repeatedly rotates around the axis by transmission from the female swing shaft 2. The movable knife 17 is configured to reciprocate according to repeated rotation of the transmission cylinder 3. The transmission cylinder 3 is internally fitted and supported by a support cylinder 4 fixed to the lower wall 12a, and a liquid between the support cylinder 4 and the transmission cylinder 3 is sealed by a seal ring 41 interposed between the fitting portions of the transmission cylinder 3 and the transmission cylinder 3. It is tightly sealed. The transmission cylinder 3 has a support bush 6 that supports the presser bar 13 so as to be movable up and down, and is interposed between the support bush 6 and the transmission cylinder 3 in a fitting portion between them. The oil seal 37 is liquid-tightly sealed.

  The above-described sealing inside and outside the transmission cylinder 3 is a sealing on a fitting circumference having a simple circular cross section, and is reliably performed using an annular sealing member such as the oil seal 37 and the seal ring 41. Therefore, the inside and outside of the head portion 12 can be satisfactorily sealed. Therefore, a mechanism that operates at a high speed, such as a needle bar drive mechanism provided inside the head unit 12, can be well lubricated with the grease or oil for lubrication enclosed in the head unit 12, and the operating speed is high. Can be achieved. The needle bar drive mechanism is a conventionally known mechanism, and is not shown in FIG.

  In the above embodiment, the seal ring 41 is used as the seal member between the support cylinder 4 and the transmission cylinder 3, and the oil seal 37 is used as the seal member between the support bush 6 and the transmission cylinder 3. Both of them may be used as a seal ring or an oil seal, and a seal member other than the seal ring and the oil seal may be used.

It is a perspective view which shows the whole structure of a delivery arm type flat stitch sewing machine provided with this invention apparatus. It is a perspective view which shows the assembly state of this invention apparatus. It is a disassembled perspective view of this invention apparatus. It is sectional drawing which shows the support structure of a transmission cylinder.

Explanation of symbols

1 Sewing machine frame 2 Female swinging shaft 3 Transmission cylinder 6 Support bush
12 Head
13 Presser bar
14 Presser foot
17 Movable knife
37 Oil seal (seal member)
41 Seal ring (seal member)

Claims (1)

A presser bar supported in the head portion at the tip of the sewing machine frame so as to be movable up and down; a presser foot attached to a lower end of the presser bar extending outwardly below the head unit; a movable knife held by the presser foot; A transmission mechanism that transmits the repetitive rotation of the knife swing shaft inside the sewing machine frame to the movable knife and reciprocates the movable knife in the direction crossing the feeding direction of the fabric pressed by the presser foot, and a decorative thread on the upper surface of the fabric A feeding arm-shaped flat stitch sewing machine female drive device comprising a decorative thread mechanism for arranging
The transmission mechanism penetrates the lower wall of the head portion in the vertical direction, and a support cylinder fixed to the lower wall;
A transmission cylinder fitted into the support cylinder and supported by the support cylinder so as to be repetitively rotatable around an axis;
A support bush which is fitted in the transmission cylinder and is supported so as to be able to rotate around an axis, and the presser bar is inserted to support the lower part of the presser bar;
An oscillating arm projecting radially outward from the upper end of the transmission cylinder projecting outward of the head portion and connected to the female swing shaft;
An attachment portion of the movable knife provided at a lower end portion of the transmission cylinder protruding outside the head portion;
A bracket for connecting a decorative yarn mechanism that connects a lower end portion of the support bush projecting outward from the lower side of the head portion to a decorative yarn mechanism provided in the vicinity of the presser foot ;
A swinging bracket that repeatedly rotates the support bushing about its axis by transmission to the upper end of the support bushing that protrudes to the inside of the head part;
An annular seal member is interposed in each of the fitting portion between the transmission cylinder and the support bush and the fitting portion between the transmission cylinder and the support cylinder, and the inside and outside of the head portion are sealed in a liquid-tight manner. A female drive device for a feed-out arm-shaped flat stitch sewing machine, characterized in that:

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