KR101145817B1 - Knife Driving Apparatus for Sewing Machine - Google Patents

Abstract

It penetrates the lower wall of the head of the sewing machine arm tip and is rotatably supported around the central axis, and installs an electric cylinder for holding the support bush of the push rod inside. The upper portion of the transmission cylinder located inside the head portion is connected to the mass swing shaft inside the sewing machine arm, and the movable scalpel is mounted on the lower portion of the transmission cylinder located outside the head portion, thereby repeating the rotation of the mass swing shaft inside the sewing machine arm. It transmits to an electric cylinder, it transmits the repetitive rotation of the said electric cylinder to the movable scalpel provided in a presser foot, and makes a movable reciprocating operation. The inside and outside of the head portion are sealed by seal members provided on the inner and outer circumferences of the electric cylinder, and the transmission from the mass swing shaft to the movable scalpel is realized without damaging the seals inside and outside the head portion, thereby achieving a high speed of operation. Provides a scalpel drive device for the sewing machine.

Sewing machine, scalpel, driven

Description

Knife Driving Apparatus for Sewing Machine}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scalpel drive device for reciprocating a movable scalpel provided on a presser foot by electric transmission from the inside of a sewing machine arm.

As a type of industrial sewing machine, the Feed-Off-Arm Sewing Machine For Flat Seaming described in Japanese Patent Publication No. 7-57272 (Examined Japanese Patent Publication No. 7-57272 (1995)) have. The delivery arm type flat sewing sewing machine has a narrow cylindrical sewing machine bed extending in one direction at a lower part of the sewing machine frame, and a sewing machine arm extending in a direction different from the sewing machine bed at the upper part of the sewing machine frame.

The sewing machine bed incorporates a transfer mechanism for sending a base and a looper for winding the bobbin thread in the lower part of the needle plate provided on the upper end part. The head part is provided in the front-end | tip of a sewing machine arm in the direction substantially orthogonal to the said sewing machine arm. The head portion supports the needle bar and the push bar so as to be movable up and down. The lower ends of the needle bar and the transfer rod protrude below the head portion and extend toward the tip of the sewing machine bed. A plurality of needles are attached to the lower end of the needle bar, and a presser foot is attached to the lower end of the push rod.

The feeding arm type flat sewing sewing machine is used for the fitting of the lower part of the brief and the shorts, for example. This fitting is carried out by overlapping the two end ends of the two bases to be fitted over and over a predetermined width, and placing them on the needle plate on the sewing machine bed, and sandwiching them between the presser feet descending together with the pressing rods. The base is cooperating with a plurality of needles moving up and down together with a needle bar and a looper reciprocating at the lower part of the needle plate while being sent from the base end side to the tip end side by the operation of the feed mechanism inside the sewing machine bed. It is put together by (協 動).

In order to perform such a fitting well, it is important that the known short end used as sewing object overlaps with the appropriate width | variety corresponding to the arrangement | positioning width of the several needle descending to a needle drop position. The delivery arm type flat sewing sewing machine described in JP-A-7-57272 is provided with a special presser foot having a scalpel mechanism (fixed scalpel and movable scalpel). The presser foot has two presser feet extending in parallel to each other in the front part of the press main body attached to the lower end of the push bar. The movable knife and the fixed knife are held on each of the two presser feet, and are opposed to each other in front of the needle drop position (the position where the needle descends). The movable blades reciprocate in a direction intersecting with the direction of the known conveyance and slidably contact the blades of the fixed blade between the pair of presser feet.

The base is introduced between a pair of presser feet in a state of being aligned on the needle plate with each other, and is placed on the needle plate, and reaches the contact position of the fixed blade and the movable blade, and is cut and trimmed. The presser foot is piled up and down the cut end of the known base and sent to the needle drop position. In this sewing machine, it is not necessary to adjust the overlap width by the manual labor of the operator, and it is possible to stably perform the stitching having a substantially constant stitching width.

The movable blades reciprocate by electric transmission from the mass swing shaft inside the sewing machine arm. The movable scalpel is mounted on a scalpel holder that allows rotation around the coaxial axis in the middle of the push bar protruding downward of the head portion, and is reciprocated by repeatedly rotating the scalpel holder. As shown in Fig. 1 of Japanese Patent Laid-Open No. 7-57272, the female holder is provided with a [-]-shaped transmission member which bypasses the front face of the head and extends into the head. The transmission member is connected to a mass swing shaft inside the sewing machine arm via a connecting rod. The scalpel shake axis is an axis that rotates repeatedly within a predetermined angle range in accordance with the rotation of the sewing machine main shaft. Repeated rotation of the scalpel rocking shaft is transmitted to the scalpel holder via the connecting rod and the transmission member to reciprocate the movable scalpel.

In the delivery complete flat sewing machine configured as described above, like most industrial sewing machines, it is necessary to speed up 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 inside the sewing machine frame and the sewing machine arm with oil or grease for lubrication.

However, the conventional delivery arm type flat sewing sewing machine has an opening provided in the front surface of the head part to receive the transmission member, and sealing this opening without inhibiting the swing of the transmission member. Since it is difficult, it is difficult to lubricate the mechanism installed in the head part, such as a needle bar drive mechanism for moving the needle up and down, and it becomes a factor which hinders the speed up of a driving speed.

The present invention has been devised in view of the above circumstances, and realizes the transmission from the scalpel shake shaft inside the sewing machine frame to the movable scalpel installed on the presser foot without damaging the seals inside and outside the head portion. It is an object of the present invention to provide a scalpel driving device for a sewing machine which can lubricate the mechanism well and does not impede the increase in the operating speed.

The scalpel driving device of the sewing machine according to the first embodiment of the present invention includes a push rod supported in the head portion of a sewing machine arm tip so as to be movable up and down, a presser foot mounted on a lower end of the push rod extending outwardly of the head portion, and the presser foot. The movable scalpel, which is held on the inside of the sewing machine arm, is transferred to the movable scalpel by repeating rotation of the scalpel shaft supported by the inside of the sewing machine arm, and reciprocating the movable scalpel in a direction crossing the known conveying direction pressed by the presser foot. In the scalpel driving device of a sewing machine having a mechanism, the electric mechanism is supported by penetrating the lower wall of the head portion in the vertical direction while holding a support bush for supporting the lower portion of the push bar therein. And a transmission cylinder that rotates repeatedly around the central axis by transmission from the mass swing shaft. And to the seal (seal) member in each of the engaging parts of the support bush engaging portion, and the bottom wall of the head portion of the motor-driven passage characterized in that mounted in the middle.

In this embodiment, the transmission cylinder penetrating the lower wall of the head part in the vertical direction rotates repeatedly around the central axis by transmission from the mass swing shaft. The transmission cylinder holds the support bush of a push rod inward, and serves as a support member of a push rod. Seal members such as oil seals and O-rings are attached to each of the engagement portions of the transmission cylinder and the support bush and the engagement portions of the lower wall of the transmission cylinder and the head portion to seal the inside and outside of the head portion in a waterproof manner.

The scalpel driving device of the sewing machine according to the second embodiment of the present invention, the swing arm of the first embodiment is installed so as to protrude radially outward in the upper end portion located inside the head portion, the swinging arm connected to the mass swing shaft And a mounting portion of the movable scalpel at a lower end portion positioned outside the head portion.

In this embodiment, the oscillating arm is protruded radially outward from the upper end of the electric cylinder located inside the head portion, and the oscillating arm is connected to the scalpel rocking shaft, while the electric cylinder positioned outside the head portion. By attaching a movable blade mounting portion at the lower end, a simple configuration of an electric mechanism for transmitting a repeating rotation of the blade swing shaft to the movable blade is realized.

The mass drive device of the sewing machine according to the third embodiment of the present invention is characterized in that the rocking arm of the second embodiment is connected to the mass swing shaft by a connecting rod whose length can be adjusted.

In this embodiment, by adjusting the length of the connecting rod, it is possible to easily connect the blade swing shaft and the electric cylinder during assembly, and after assembly, the rotation range of the electric cylinder is changed. In addition, it is possible to finely adjust the reciprocating range of the movable blade generated by the rotation.

The objects and novel features of these inventions will become more fully apparent upon reading the following detailed description in light of the accompanying drawings.

In the scalpel driving device of the sewing machine of the present invention, the repetitive rotation of the scalpel swing shaft inside the sewing machine frame is transmitted to a transmission tube penetrating the lower wall of the head portion, and the movable scalpel held by the presser foot is reciprocated by the repeated rotation of the transmission cylinder. It is set as the structure to operate. The inside and the outside of the head portion can be reliably sealed by the seal member provided on the inner circumference and the outer circumference of the electric cylinder, and the head portion such as the needle bar drive mechanism by the lubricating grease or oil enclosed in the head portion. The internal mechanism can be lubricated satisfactorily, and it becomes possible to meet the request of speeding up operation speed.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is explained in full detail based on drawing which shows preferable embodiment. 1 is a perspective view showing the overall configuration of a delivery sewing type flat sewing sewing machine including a scalpel driving device of a sewing machine according to an embodiment of the present invention.

As shown in the figure, the delivery arm type flat sewing sewing machine has a sewing machine arm 10 extending in one direction on the upper part of the sewing machine frame 1, and in a different direction from the sewing machine arm 10 in the lower part of the sewing machine frame 1; A narrow tubular sewing machine bed 11 is provided. At the distal end of the sewing machine arm 10, a head portion 12 that forms a hollow rectangular block in a direction orthogonal to the sewing machine arm 10 is provided in succession.

The push bar 13 is supported by the head part 12. The presser foot 14 is attached to the lower end of the push rod 13 extending toward the distal end of the sewing machine bed 11. The push bar 13 is supported so that it can move up and down as described later. The needle plate 15 is provided across the upper surface of the distal end of the sewing machine bed 11, and a transfer mechanism and a looper (not shown) are disposed inside the sewing machine bed 11 below the needle plate 15. .

The presser foot 14 descends above the needle plate 15 by the downward movement of the push bar 13, and sandwiches a base (not shown) between the needle plate 15 and the needle plate 15. The base held between the presser foot 14 and the needle plate 15 is subjected to a transfer from the base end of the sewing machine bed 11 toward the tip side by the operation of the transfer mechanism inside the sewing machine bed 11. A plurality of needles (not shown) which move up and down in synchronization with this song and the looper which reciprocate on the lower part of the needle plate 15 are matched and put together.

The presser foot 14 is provided with a pair of left and right presser feet 14a and 14a extending toward the base (introduction side of the base) of the sewing machine bed 11, and the fixed blades are provided on the presser feet 14a and 14a. A scalpel mechanism including a 16 and a movable scalpel 17 is provided.

In FIG. 1, the base of the fixed blade 16 is shown. The fixed scalpel 16 is a plate-shaped scalpel fixed to one presser foot 14a, and has a blade at a distal end projecting between the other presser foot 14a. The movable scalpel 17 (see Figs. 2 and 3) is held by the other presser foot 14a, and is substantially perpendicular to the presser foot 14a, 14a by the operation of the scalpel drive device described later. Reciprocating operation. The movable blade 17 which reciprocates is slidably in contact with the blade of the fixed blade 16, and as is well known, the known end is introduced in a state of being fitted to each other between the pawls 14a and 14a. Cut and trim. The base cut neatly is piled up and down by the action of the presser foot 14 on the downstream side of the scalpel mechanism, and is sent to the needle drop position to be sewn.

The feature of the present embodiment lies in the configuration of the blade drive device for reciprocating the movable blade 17. 2 is a perspective view showing an assembled state of a scalpel drive device according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of the scalpel drive device according to an embodiment of the present invention.

 Reference numeral 2 in Figs. 2 and 3 represents a scalpel rocking axis. The scalpel rocking shaft 2 is a rotating shaft supported across the inside of the sewing machine arm 10 in the transverse direction. At one end of the scalpel rocking shaft 2, a rocking arm 20 protruding radially outward is fixed. The scalpel swing shaft 2 is repeatedly rotated around the central axis within a predetermined angle range by transmission from a sewing machine main shaft (not shown), and the swinging arm 20 is adapted to the repeated rotation of the scalpel swing shaft 2. Therefore, it swings.

 The code | symbol 3 in FIG. 2, 3 is an electric cylinder. At one end in the axial length direction of the cylindrical transmission cylinder 3, the scalpel bracket 30 is provided to protrude radially outward as shown in FIG.

 4 is a cross-sectional view showing the supporting structure of the electric cylinder 3. As shown in FIG. As shown in the figure, the transmission cylinder 3 is supported by the lower wall 12a of the head portion 12 via a cylindrical support cylinder 4. The support cylinder 4 is fixed so that the lower wall 12a of the head part 12 may penetrate up and down. The support cylinder 4 can also be comprised integrally with the head part 12. The transmission cylinder 3 is supported by being inserted into the support cylinder 4 from the outside of the head portion 12 with the protruding side of the scalpel 30 downward, and allowing rotation about the central axis. have.

 The upper part of the transmission cylinder 3 protrudes a proper length inside the head part 12, and the rocking bracket 31 is being fixed to this protrusion part. The swinging bracket 31 supports the support cylinder 4 between the female bracket 30 provided in the lower part of the transmission cylinder 3, and supports the transmission cylinder 3 so that it may not fall out from the said support cylinder 4. ) Also supports the action.

 Between the lower end surface of the support cylinder 4 and the scalpel bracket 30, the sliding plate 40 is attached in the middle as shown to FIG. 3,4. The electric cylinder 3 can be rotated under a small resistance by the action of the sliding plate 40. In addition, a seal ring 41 is attached to the lower portion of the support cylinder 4 so as to be in close contact with the outer circumference of the transmission cylinder 3. The seal 41 is a seal member sealingly sealing the engagement portion between the transmission cylinder 3 and the support cylinder 4, that is, the engagement portion of the transmission cylinder 3 and the lower wall 12a of the head portion 12. .

 The swinging bracket 31 is provided with the swinging arm 32 which protrudes radially outward as shown to FIG. 2,3. The swinging arm 32 is connected to the swinging arm 20 of the mass swing shaft 2 by connecting rods 5 having ball joints 50 and 50 at both ends. The connecting rod 5 transmits the rocking of the rocking arm 20 by the repeated rotation of the scalpel rocking shaft 2 to the rocking bracket 31 provided with the rocking arm 32. The swinging bracket 31 swings in accordance with the swinging of the swinging arm 20, and the transmission cylinder 3 to which the swinging bracket 31 is fixed is within an angle range corresponding to repeated rotation of the scalpel swing shaft 2. Rotate repeatedly.

 As described above, the transmission cylinder 3 rotates repeatedly around the shaft in accordance with the repeated rotation of the mass 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 act to absorb the relative positional change of the rocking arm 20 and the rocking arm 32. In addition, as shown in FIG. 3, the ball joints 50 and 50 are mounted so that the position adjustment of the axial longitudinal direction by a screw is possible. This position adjustment is based on the length of the connecting rod 5 in accordance with the actual position of the swinging arm 20 of the scalpel swing shaft 2 and the swinging arm 32 of the transmission cylinder 3 at the time of assembling the scalpel drive device. Is done to adjust. In addition, by adjusting the length of the connecting rod 5 after assembling, it is possible to finely adjust the reciprocating motion range of the movable blade 17 generated as described later.

 The female bracket 30 provided in the lower end part of the transmission cylinder 3 is provided with the fixed seat 33 extended below, as shown in FIG. 3, and the mounting stand 34 is attached to the fixed seat 33; Is fixed.

 The movable scalpel 17 is a plate-shaped scalpel, and the base is fixed to the scalpel holder 35 attached to the lower portion of the mounting table 34 as shown in FIGS. 2 and 3.

 The distal end of the movable blade 17 passes through a guide hole provided in one presser foot 14a of the presser foot 14. The guide hole holds the movable blade 17 in a reciprocating direction in a direction substantially orthogonal to the presser feet 14a and 14a. The movable scalpel 17 reciprocates by swinging the scalpel bracket 30 in accordance with repetitive rotation of the transmission cylinder 3. The scalpel holder 35 can be rotated with respect to the mounting table 34 by resisting the spring force of the coil spring 36 attached to the rotation support part in the middle, and by this rotation, the movable scalpel 17 is a scalpel bracket. It is possible to reciprocate without being influenced by the shaking caused by the swing of (30).

The transmission cylinder 3 holds the cylindrical support bush 6 inside. As shown to FIG.2, 3, the support bush 6 is equipped with the hook bracket 60 which protrudes radially outward at one edge part of an axial longitudinal direction. As shown in FIG. 4, the support bush 6 is fitted inwardly to the transmission cylinder 3 from the outside of the head part 12 with the hook bracket 60 side down. The support bush 6 can be rotated around the central axis.

The upper part of the support bush 6 protrudes a proper length from the upper end of the transmission cylinder 3 to the inner side of the head part 12. The rocking bracket 61 is fixed to the upper end of the support bush 6. The swing bracket 61 holds the transmission cylinder 3 between the hook bracket 60 and supports the support bush 6 so that the transmission cylinder 3 does not fall up and down. The oil seal 37 is attached to the lower end part of the transmission cylinder 3 so that the outer periphery of the support bush 6 may contact and contact. The oil seal 37 is a seal member sealingly sealing the space between the support bush 6 and the transmission cylinder 3.

In the support bush 6, as shown in FIG. 4, the push bar 13 penetrates. The upper part of the push rod 13 is stuck in the upper bush 7 which was fixed so that it penetrated to the upper wall 12b of the head part 12 in the up-down direction. In this way, the pressing rod 13 is supported by two places spaced up and down by the upper bush 7 and the support bush 6, and can be moved up and down under the guidance of these bushes 6 and 7. . In addition, the push bar 13 is shown by the dashed-dotted line in FIG.

The upper bush 7 protrudes above the head 12, and the adjusting screw 70 is screwed to the upper end of the upper bush 7. Between the lower end part of the adjustment screw 70 and the upper end part of the push bar 13, the press spring 71 which used the coil spring is attached in the middle. The pressing spring 71 applies a spring force in the downward direction to the pressing rod 13, and applies a force to the pressing foot 14 attached to the lower end of the pressing rod 13 in the downward direction. In addition, illustration of the presser foot 14 is abbreviate | omitted in FIG.

The magnitude of the spring force of the pressing spring 71 can be adjusted by rotating the knob 72 provided on the upper end of the adjusting screw 70 to change the amount of rotation of the adjusting screw 70. . The adjusted spring force can be maintained by tightening the lock nut 73 provided in the middle of the adjustment screw 70. The adjustment of the spring force is performed in order to change the force for pressing the base held between the presser foot 14 and the needle plate 15 as described above. An oil seal 62 is attached to the lower end of the support bush 6 so as to contact and contact the outer circumference of the push bar 13. The oil seal 62 seals between the support bush 6 and the press bar 13 in a waterproof manner.

The support bush 6 rotates repeatedly by transmission to the rocking bracket 61 provided at the upper end. As shown in FIG. 4, between the lower end surface of the transmission cylinder 3 and the hook bracket 60, the sliding plate 38 is attached in the middle. The sliding plate 38 serves to smoothly repeat the rotation of the support bush 6 in the inside of the transmission cylinder 3.

The hook bracket 60 of the lower end of the support bush 6 is connected to the decorative chamber mechanism (refer FIG. 1) provided in the vicinity of the presser foot 14. As shown in FIG. The decorative chamber mechanism operates in accordance with the repetitive rotation of the support bush 6, and arranges the decorative chamber on the upper surface of the base under sewing as is known. As described above, the scalpel drive device of the present invention includes a transmission cylinder 3 supported by the support cylinder 4 penetrating the lower wall 12a of the head portion 12 in the vertical direction.

The transmission cylinder 3 rotates repeatedly around the central axis by transmission from the mass swing shaft 2, and the movable blade 17 reciprocates in accordance with the repeated rotation of the transmission cylinder 3. Between the transmission cylinder 3 and the support cylinder 4, it is sealed by water-sealing by the sealing 41 attached in the middle of both engaging parts. In addition, the transmission cylinder 3 holds the support bush 6 for supporting the push bar 13 so as to be movable up and down, and between the transmission cylinder 3 and the support bush 6, It is sealed in a watertight manner by the oil seal 37 attached to the engaging part of both.

The seal inside and outside the electric cylinder 3 as mentioned above is a seal in the engagement circumference part which has a simple circular cross section, and annular seal members, such as the oil seal 37 and the sealing 41, which were mentioned above. It is possible to reliably carry out using, and it is possible to seal the inside and outside of the head part 12 favorably. Therefore, it is possible to satisfactorily lubricate a mechanism that operates on the highway, such as a needle bar drive mechanism provided inside the head portion 12, with lubricating grease or oil enclosed in the head portion 12, thereby increasing the operating speed. It is possible to achieve. In addition, since the mechanism inside the head part 12 containing a needle bar drive mechanism is a well-known mechanism, the illustration in FIG. 4 is abbreviate | omitted.

In the above embodiment, the seal 41 is used as the seal member between the support cylinder 4 and the transmission cylinder 3, and oil is used as the seal member between the support bush 6 and the transmission cylinder 3. Although the seal 37 is used, both seal members may be sealed together, and both seal members may be oil seals together. Furthermore, it is also possible to use seal members other than a seal and an oil seal.

As mentioned above, the embodiment described in the detailed description of the invention is intended to clarify the technical content of the present invention to the last, and the present invention is not to be construed as limited to only such specific examples, but the spirit and claims of the present invention. It is possible to perform various changes within the range described in the following.

1 is an external perspective view of a delivery sewing type flat sewing sewing machine having a scalpel drive device according to an embodiment of the present invention.

2 is a perspective view showing the assembled state of the scalpel drive device according to an embodiment of the present invention.

3 is an exploded perspective view of a scalpel drive device according to an embodiment of the present invention.

4 is a cross-sectional view showing a support structure of an electric cylinder.

<Description of the symbols for the main parts of the drawings>

2: scalpel shaker 3: electric cylinder

31: rocking bracket 32: rocking arm

33: fixed seat 34: mounting base

35: female holder 4: support container

40: sliding plate 41: sealing

6: bush

Claims (5)

A presser rod supported in the head portion of the sewing machine arm tip so as to be movable up and down, a presser foot mounted on a lower end of the presser rod extending outwardly of the head portion, a movable scalpel held by the presser foot, and a scalpel supported inside the sewing machine arm. In the mass drive device of a sewing machine provided with a transmission mechanism for transmitting a reciprocating rotation of a rocking shaft to the movable scalpel and reciprocating the movable scalpel in a direction crossing the known conveying direction pressed by the presser foot, The electric mechanism, A support bush for supporting the lower part of the push rod is held inside, and is supported by penetrating the lower wall of the head portion in the vertical direction, and repeatedly rotated around the central axis by transmission from the scalpel swing shaft. Equipped with an electric cylinder, The electric cylinder, It is installed to protrude radially outward in the upper end portion located inside the head portion, and has a rocking arm connected to the scalpel shaft by the adjustable length of the connecting rod, the lower portion located outside the head portion Equipped with a mounting portion of the movable scalpel, A seal driving device of the sewing machine, characterized in that a seal member is attached to each of the engaging portion of the transmission barrel and the support bush and the engaging portion of the lower wall of the transmission cylinder and the head portion. The method of claim 1, The electric cylinder, Scalpel drive device of the sewing machine, characterized in that the support is fitted to the support cylinder fixed to the lower wall of the head. The method according to claim 1 or 2, In the vicinity of the presser foot, a decorative chamber mechanism for arranging a decorative chamber on the upper surface of the base, The support bushing, Scalpel drive device of the sewing machine, characterized in that connected to the decorative chamber mechanism by a hook bracket provided on the lower end protruding to the outside of the head. The method according to claim 1 or 2, The sewing machine is a delivery complete flat sewing machine, The movable scalpel, Scalpel drive device of the sewing machine, characterized in that the reciprocating operation in the direction intersecting the transfer direction of the base. The method of claim 3, The sewing machine is a delivery complete flat sewing machine, The movable scalpel, Scalpel drive device of the sewing machine, characterized in that the reciprocating operation in the direction intersecting the transfer direction of the base.

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