JP2837189B2 - Swinging device for presser foot in embroidery sewing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth presser swinging device which constitutes a cloth feeder of an embroidery sewing machine.

[Conventional technology]

FIG. 5 shows a known work clamp swinging device for a lockstitch handle embroidery sewing machine.

That is, the presser foot swinging device is loosely fitted to the vertical needle bar sleeve 1 and freely swings up and down around the first swing shaft 2 by the horizontal first swing shaft 2. The swinging piece 3 is attached, a cloth foot 4 is provided at the lower end, and a ring 5 is provided at an upper and lower middle part. The swinging piece 3 is mounted on the swinging piece 3 at right angles to the first swinging piece 2. A swing lever 7 pivotally supported at its upper end by a second swing shaft 6 provided so as to be horizontal in the state and swingably movable back and forth and left and right, and a feed lever 8 using a horizontal pin 9 as a fulcrum. The feed lever 8 is rotatably held so that the lower end 8a of the feed lever 8 is locked between the ring 5 and the receiver 10 rotatably fitted to the ring 5 and the receiver 10
Is movably fitted along the guide hole 10a in the diametrical direction of the ring 5 and is rotated by the rotation of the feed lever 8 about the pin 9 as a fulcrum. A rotary member 11 for moving the feed lever 8 in the diameter direction thereof, and pressing the upper end 8b of the feed lever 8 to move the feed lever 8 to the pin 9
And a cam member 12 for rotating the needle bar sleeve 1 around the fulcrum. The rotating member 11 rotates the needle bar sleeve 1 in the same direction and at the same speed as the needle bar sleeve 1 so that the gear 13 and the intermediate gear 14, and The cam member 12 is mounted on the rotating shaft 16 so as to be movable up and down and to rotate together with the rotating shaft 16. .

And the feed rotation horizontal axis by Hindle (not shown)
When the needle bar sleeve 1 is rotated via the bevel gears 17 and the bevel gears 18 and 19, the rotating member 11 and the cam member 12 rotate together with the rotating shaft 16 in conjunction therewith, and the up-and-down mechanism (not shown) When the cam member 12 is depressed by the operation, the feed lever 8 rotates clockwise in FIG. 5 around the pin 9 and moves the ring 5 to the left to move the swing lever 7 about the second swing shaft 6. It is structured to swing to the left. The state of FIG.
Is rotated 90 degrees and the feed lever 8 is moved toward or toward the rotary shaft 16, the swing lever 7 swings about the first swing shaft 2 in a direction perpendicular to the plane of the drawing. The swing piece 3 is loosely fitted to the needle bar sleeve 1.

[Problems to be solved by the invention]

However, in the above-described conventional structure, the swing lever 7 which can swing back and forth and right and left with respect to the needle bar sleeve 1 is provided at a position which is largely deviated laterally from the center line of the needle bar sleeve 1. In order to swing by 5 and rotating member 11, etc.
The amount of movement of the cloth moved by the cloth presser 4 is not the same in all directions of 360 degrees, and slightly varies depending on the direction, so that a completely uniform seam cannot be obtained. Therefore, when embroidering a fine pattern, a sewing manufacturer must correct the difference in the feed direction, and the operation requires skill. Further, since it is impossible to reduce the backlash of the gears 13, 14, 15 to zero, the accuracy of following the cloth feeding direction is reduced due to the backlash, and also in this respect, embroidery of a fine pattern is impeded. Furthermore, the gears 13, 14, 15 and the rotating shaft 1
6 and the need for additional members such as bearings, there is also a problem that the overall structure is complicated and large.

In the present invention, the amount of cloth feed movement of the presser foot becomes the same in all directions of 360 degrees, and it is easy to perform precise embroidery,
An object of the present invention is to provide a presser swinging device for an embroidery sewing machine which has a simple overall structure and can be easily compacted.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a needle bar sleeve which is swingable up and down around the first swing shaft by a first horizontal swing shaft loosely fitted to a vertical needle bar sleeve. An attached swing piece, a cloth presser at a lower end, and a ring at upper and lower intermediate portions, respectively, are provided with a ring at right angles to the first swing axis. A swinging lever pivotally supported at its upper end by a second swinging shaft provided so as to swing back and forth and left and right, and a feed lever rotatably around a horizontal pin as a fulcrum. One end of the lever is engaged with the ring, and is inserted into the ring so as to be rotatable in the circumferential direction of the ring and relatively movably in the diameter direction of the ring. A rotating member for moving the ring in the diameter direction by movement, and the other end of the feed lever And a cam member for pressing the feed lever to rotate the feed lever about a pin as a fulcrum, wherein the rotating member is fixed to the needle bar sleeve by fixing the rotating member to the needle bar sleeve. The rod sleeve is provided so as to be movable in the axial direction of the needle bar sleeve.

[Action]

The rotating member fitted and fixed integrally with the needle bar sleeve rotates completely integrally with the needle bar sleeve. For this reason,
The tracking accuracy in the cloth feeding direction is not impaired. Also,
The cam member moves along the needle bar sleeve to rotate the feed lever about the pin as a fulcrum, and swings the swing lever about the swing axis via the ring. Since the rotating member is attached to the needle bar sleeve as described above, the moving amount of the cloth by the cloth presser does not differ depending on the direction, and is the same in all directions of 360 degrees. Therefore, the pattern can be embroidered precisely without correcting the difference in the feeding direction.

〔Example〕

1 to 4 show an embodiment of the present invention. The same parts as those in the conventional example shown in FIG.

In the present invention, the rotating member 11 is fitted to the needle bar sleeve 1 and fixed integrally with a set screw 20, and the cam member 12 is attached to the needle bar sleeve 1 so as to be vertically movable. A bottom plate 21 having a rectangular guide hole 21a similarly to the receiving member 10 is attached below the receiving member 10 with a screw 22. Notches 10b and 21b are formed in the receiving member 10 and the bottom plate 21, and the lower end 8a of the feed lever 8 is inserted into the notches 10b and 21b so that the ring 5, the receiving member 10 and the bottom plate 21 are formed.
It is locked between. The lower portion 11a of the rotating member 11 is formed in a square shape, and the lower portion 11a is formed with guide holes 10a, 2a of the receiving member 10 and the bottom plate 21.
1a, and is relatively movable in the diameter direction of the ring 5.

In addition, coil springs 23 are provided on both left and right sides of the rotating member 11 with screws.
24, the one end 23a of which is attached to the small hole 11b of the rotating member 11.
And the other end (lower end) of the receiving device 10 and the bottom plate 21
The lower end 8a of the feed lever 8 is separated from the needle bar sleeve 1 as shown in FIG.
And the bottom plate 21 is urged. In the upper part of the cam member 12,
A locking groove 12a is formed along the circumferential direction, and a vertical groove 12c having a bottom surface as a cam surface 12b is formed vertically below the locking groove 12a. The vertical groove 12c of the cam member 12
The upper end 8b of the feed lever 8 is fitted into the engaging groove 12a. The engaging groove 12a of the cam member 12 is engaged with an engaging portion 26a of an upper and lower member 26 which is attached to the frame 25 vertically.

The upper and lower members 26 are pushed down by a vertical mechanism such as a lever and a cam against the elasticity of a return spring 27 in synchronization with the sewing operation of the needle bar sleeve 1 to lower the cam member 12 along the needle bar sleeve 1. .

The feed rotary horizontal shaft 17 is provided with a handle shaft 30 rotated by a handle 29, a bevel gear 31, 32, a transmission shaft 33, a bevel gear 34 (in FIG. 1, the bevel gear 32 overlaps), and a heavy gear 3
5, which are connected via a transmission shaft 36, bevel gears 37, 38, a feed rotating vertical shaft 39, and a bevel gear 40, 41. The rotation of the handle shaft 30 by the handle 29 is applied to the needle bar sleeve 1 in a one-to-one rotation ratio. To tell.

Next, the operation of the presser swinging device in the embroidery sewing machine according to the present invention configured as described above will be described.

To change the cloth feeding direction, the handle 29 is used to rotate the handle shaft 30. The rotation of the handle shaft 30 is transmitted to the bevel gear 19 via the bevel gear 31 and the like, and the needle bar sleeve 1, the rotating member 11 attached to the needle bar sleeve 1, and the cam member 12 rotate the handle shaft 30 by the rotation angle. And rotate in the circumferential direction according to the rotation direction.

When the vertical member 26 which moves up and down in synchronization with the sewing operation of the needle bar sleeve 1 descends, the cam member 12 is pushed down along the needle bar sleeve 1 and the upper end 8b of the feed lever 8 is moved to the cam surface 12b.
b, the feed lever 8 rotates counterclockwise in FIG. 2 with the pin 9 as a fulcrum, and the ring 5 together with the receiving member 10 and the bottom plate 21 is pressed against the elasticity of the coil spring 23 in the second direction. Push right in the figure. As a result, the swing lever 7 swings about the swing shafts 2 and 6 as a fulcrum, and the cloth is fed by the work clamp 4 in the direction in which the ring 5 is pushed and moved. When the cam member 12 is raised by raising the vertical member 26, the receiving member 10, the ring 5 and the like return to the original state in FIG.

The cloth presser 4 actually feeds the cloth by the above-mentioned rocking operation of the rocking lever 7 and the up-down action, but the up-down action of the cloth presser 4 and the sewing operation of the needle bar sleeve 1 are the same as in the prior art. . The needle bar sleeve 1 may have a new structure in which a needle is attached to the lower end of the pipe.

〔The invention's effect〕

As described above, the swinging device for the presser foot in the embroidery sewing machine according to the present invention is configured such that the horizontal first swinging shaft loosely fitted to the vertical needle bar sleeve swings up and down around the first swinging shaft as a fulcrum. A swinging piece movably attached to the needle bar sleeve, a presser foot at the lower end, and a ring at the upper and lower intermediate portions, each of which has a swinging piece that is orthogonal to the first swinging axis; A swing lever, which is pivotally supported at its upper end by a second swing shaft provided so as to be horizontal when the shaft is in a horizontal state and is swingably movable back and forth and right and left, and rotates a feed lever around a horizontal pin as a fulcrum. The feed lever is movably engaged with one end of the feed lever and is engaged with the ring so as to be rotatable in the circumferential direction of the ring and relatively movably in the diameter direction of the ring. A rotation in which the ring is moved in the diameter direction by rotating the feed lever serving as a fulcrum. In a cloth press swinging device for an embroidery sewing machine, comprising a member and a cam member for pressing the other end of the feed lever to rotate the feed lever about a pin as a fulcrum, the rotating member is fitted to the needle bar sleeve. And the cam member is provided on the needle bar sleeve so as to be movable in the axial direction of the needle bar sleeve, so that the follow-up accuracy in the cloth feeding direction is not impaired. In addition, the amount of movement of the cloth by the cloth presser does not differ depending on the direction, and is the same in all directions of 360 degrees. Therefore, the pattern can be embroidered precisely without correcting the difference in the feeding direction. Further, since it is not necessary to separately provide a rotation, a gear, and the like, the entire structure is simplified and the device can be made compact.

[Brief description of the drawings]

1 to 4 show one embodiment of the present invention.
FIG. 1 is a side view showing the internal structure of a lockstitch handle embroidery sewing machine equipped with a cloth presser swinging device according to the present invention. FIG. 2 is a schematic cross-sectional view showing the relationship between a needle bar sleeve and a rotating member or a cam member. FIG. 3 is an external view showing the disassembled state of the swing piece, the swing lever, the ring, the receiving member and the like, and FIG. 4 is an external view showing the disassembled state of the rotating member, the cam member, the feed lever and the like. Fifth
The figure is a schematic view of a conventional presser swinging device. DESCRIPTION OF SYMBOLS 1 ... Needle bar sleeve, 2 ... Swing axis 3 ... Swing piece, 4 ... Feet holder 5 ... Ring, 6 ... Swing axis 7 ... Swing lever, 8 ... Feed lever 9 ... ... Pin, 11 ... Rotating member 12 ... Cam member

Claims (1)

(57) [Claims] The horizontal first needle bar sleeve is loosely fitted in a vertical needle bar sleeve.
A swinging piece attached to the needle bar sleeve so as to swing up and down on the first swinging axis with the swinging axis as a fulcrum, a cloth presser at a lower end, and a ring at an upper and lower middle portion; The upper end is pivotally supported by a second oscillating shaft, which is provided on the oscillating piece so as to be horizontal when the oscillating shaft is in a horizontal state, and is provided so as to be able to swing back and forth and right and left. A swinging lever and a feed lever rotatably around a horizontal pin as a fulcrum. One end of the feed lever is locked to the ring so as to be rotatable in the ring in the circumferential direction of the ring, and A rotary member that is relatively movably fitted in the diametric direction, and that moves the ring in the diametric direction by rotating the feed lever with the pin as a fulcrum; and a feed lever that presses the other end of the feed lever. Embroidery sewing machine having a cam member for rotating the The rotating member is fixed to the needle bar sleeve by being fitted thereto, and the cam member is provided on the needle bar sleeve so as to be movable in the axial direction of the needle bar sleeve. Swinging device in the embroidery sewing machine.