JPS5929988Y2 - Boring device for embroidery sewing machine - Google Patents

Description

[Detailed Description of the Invention] This invention particularly relates to a polling device for incising eyelets in the fabric prior to embroidering when eyelet embroidery is applied to the fabric in an industrial embroidery sewing machine.

Conventionally, in this type of polling device, the upper end of a coil spring C is fitted around the base of a knife M attached to the lower end of the needle bar R via a cylindrical sleeve S, as shown in FIG. At the same time, a ring-shaped presser foot N is fitted to the lower end of the spring C. When the presser foot N moves downward together with the knife M as the needle bar R moves downward, the presser foot N presses the fabric against the needle. Coil spring C is pressed against the upper surface of plate P.
is retracted and the knife M is projected, and the knife M is configured to pierce the fabric and cut out the eyelet. In this case, the presser foot N is suspended from the free end of the coil spring S. Therefore, when pressed against the throat plate P, the eyelets tend to move loosely, making the clamping state of the fabric unstable and causing uneven discharging force against the fabric in the circumferential direction, causing uneven shapes and positional deviations of the eyelets. There were drawbacks.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, an object of the present invention is to provide a polling device for a tendon embroidery sewing machine that can reliably grip the fabric on which an eyelet is to be stitched and accurately cut out the eyelet.

Next, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 indicates a head mounted so as to be horizontally movable with respect to a support frame W of an embroidery sewing machine;
is a needle bar vertically arranged in parallel with the head 1, and the head They are vertically moved selectively in conjunction with one horizontal movement.

Sewing needles 4 to 4 are fixed to the lower end of the needle bar 2, respectively, for selectively embroidering using various or multicolored sewing threads.

Next, the polling device B will be described. Reference numeral 5 denotes a movable shaft vertically installed at the right end of the hemlock 1 in the figure. When the needle bar moves to the third position, the locking end 3
It is linked to and moves up and down.

Reference numeral 6 denotes a holder fitted to the lower end portion of the movable shaft 5, and a mounting hole 6b is vertically formed through the arm portion 6a extending to the left in the figure.

Reference numeral 8 denotes a scalpel which is vertically fitted into the mounting hole 6b of the holster 6 via screws 7, and has a round bar-shaped base 8a at its upper part, and a conical blade part 8b at its lower part. The outer diameter of the upper end of the blade portion 8b is the same as that of the base portion 8a.
It is formed to be thicker than the outer diameter of the base portion 8a, and a stepped portion 8c is formed at the boundary between the base portion 8a and the blade portion 8b.

In order to cut the eyelet sharply, the blade part 8b has four concentrically downwardly inclined blade lines H--H in this example as shown in FIG. The cross section with the cutting edge angle A as an acute angle is formed into a concave and concave regular square shape.

Incidentally, when the cloth F is cut with the blade portion 8b, a medium-sized eyelet is cut in the cloth F.

Reference numeral 9 denotes a planer fitted to the base 8a of the knife 80 so as to be slidable up and down, and its upper niha fitting hole 9a is inserted through so as to be able to fit into the base 8a of the knife 80. A protruding piece 9b is provided in an annular manner on the outer periphery of the vicinity, and a hollow part 9c is recessed in the lower part of the protruding piece 9b so as to surround and protect the blade part 8b of the scalpel 8. comes into contact with the stepped portion 8° of the knife 8, and the downward movement of the plenosa 9 is restricted.

Reference numeral 10 denotes a gripping ring fitted to the lower end of the plenosa 9, which is made of rubber or @
It is molded into an annular shape from an elastic material such as resin, and has a tapered surface 10 on the inner circumferential surface of the lower end that becomes a pressure contact surface against the fabric F.
a is formed.

Reference numeral 11 denotes a spring that is interposed between the arm portion 6a of the holder 6 and the projecting piece 9b of the planosaur 9 so as to surround the planosaur 9, and normally urges the planosaur 9 downward.

Reference numeral 12 designates an escape hole that is provided through the throat plate 13 horizontally suspended below the head 1 so that the blade portion 8b of the knife 8 can be inserted thereinto.

Reference numeral 14 denotes a gripping plate, which has escape holes 12 for gripping the eyelet-type portion of the fabric F in an annular manner in cooperation with the plenosa 9.
The throat plate 13 on the periphery is attached upward, and is molded into a disc shape from an elastic material such as rubber or synthetic resin in order to enhance the gripping effect on the fabric F. The tapered surface 10a of the gripping ring 10, the corresponding gripping surface 1 so that 14 can engage with the gripping ring 10 of the planosa 9.
4a is formed in a tapered shape, and a through hole 14b is formed in the center thereof so that the blade part 8b of the scalpel 8 that has been lowered to the lower end position is inserted into the blade part 8b in a substantially tight manner. They are installed in similar shapes.

Next, the operation and effects of the embodiment having the above configuration will be explained.

Now, when forming an eyelet prior to embroidering, the movable shaft 5, which is moved to a position facing the engaging end 3 by horizontal movement of the head 1 and becomes active, is engaged. When the joint end 3 moves downward in conjunction with the mating end 3, the plenosa 9 moves downward together with the knife 8, and during the downward movement, the grip ring 10 of the plenosa 9 passes through the fabric F and grips the grip plate 14 on the throat plate 13.
is engaged with.

Furthermore, when the movable shaft 5 moves downward, the spring 11 retracts and the plenosa 9 is pressed downward, and the grip ring 10 and the grip plate 14 are attached to the cloth F through the tapered surface 10a and the grip surface 14a.
At the same time, the blade part 8b of the knife 8, which protrudes from the hollow part 9b of the plenosa 9 and moves downward, utilizes the clamped fabric F and rushes into the escape hole 12 and the through hole 14b, and the fabric F The eyelet is incised.

In this example, the plenosa 9 is fitted into the base 8avC of the knife 8 so that it can slide up and down and the blade part 88b of the knife 8 can be moved in and out. is configured so that the fabric F can be brought into pressure contact with the gripping plate 14 with the guidance of the base 8b, so that the plenosa 9
is accurately guided along the axis of the knife 8, and the grip ring 1
Since the tapered surface 10a of the grip plate 14 evenly presses the cloth F against the gripping surface 14K of the gripping plate 14 and clamps the cloth F, the gripping force on the cloth FK can be made uniform in the circumferential direction.

Therefore, when the blade part 8b of the scalpel 8 actually cuts the fabric F, the eyelet Y is accurately corrected by eliminating the problem of the fabric partially slipping or loosening due to uneven gripping force on the fabric FK and causing the eyelet to be cut incorrectly. It is also symmetrical [has useful features].

In particular, in this example, the fabric F is held on the tapered surface 1 of the gripping ring 10.
0a and the gripping surface 14avC of the gripping plate 14, so that both sides 10. The anti-slip effect of 14a is synergistically enhanced, and the gripping force on the fabric FK is significantly enhanced,
This has the effect of preventing partial slipping of the fabric, which tends to occur when the fabric is removed flatly with a scalpel.

That is, in the present invention, a movable shaft that is vertically movable relative to the head of an embroidery sewing machine has a knife having a blade portion formed to cut an eyelet in the fabric on the throat plate prior to embroidery sewing. is a polling device vertically attached via a base provided above the blade, and further comprising:
A plexer is fitted to the base of the scalpel so that it can slide up and down and the blade can be moved in and out, and when the scalpel is moved down to pierce the fabric, the plexa is guided by the base to By elastically mounting the plexer so as to press the fabric in an annular manner against the gripping surface formed on the throat plate, the fabric can be gripped reliably and uniformly to accurately cut out the eyelet for eyelet embroidery. Therefore, it is an extremely excellent device as a polling device for an embroidery sewing machine.

[Brief explanation of the drawing]

Figure 1 is a side view showing an example of a conventional polling device; Figure 2 is a side view showing an example of a conventional polling device;
Figures 7 to 7 show an embodiment of the present invention. Figure 2 is a plan view of the road body showing the head of an embroidery sewing machine, Figure 3 is an enlarged side view of the main parts, and Figure 4 is the same side view. 5 is a bottom view, FIG. 6 is an enlarged side sectional view of the main part when the eyelet is incised, and FIG. 7 is a partially cutaway perspective view of the scalpel. 1... Head, 5... Movable axis, 8... Female, 8a
...Base, 8b...Blade, 9...Plenosa, 13
... Throat plate, 14a... Gripping surface.

Claims (1)

[Scope of utility model registration request] A movable shaft that is vertically movable relative to the hem of the embroidery sewing machine is equipped with a scalpel having a blade formed to cut an eyelet in the fabric on the throat plate prior to embroidery sewing. The polling device is vertically attached via a base provided above, and furthermore, a plenosa is fitted to the base of the scalpel so that it can slide up and down and the blade can be moved in and out, and the scalpel is The plenosa is elastically loaded so that when the plenosa moves downward to pierce the fabric, the plenosa can annularly press the fabric against a gripping surface formed on the throat plate under the guidance of the base. A polling device for embroidery sewing machines with various features.