JPS59194788A - Presser of sewing machine and production thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cloth presser foot that can be attached to and removed from the lower end of a presser bar of a sewing machine.

When sewing a zigzag pattern such as satin stitch, or when sewing multiple threads at narrow intervals or in one row, apply 1 O, and if you cannot see through the presser foot to see the seam, apply 1ξ force at the M stitch. ) I can confirm that it is difficult to sew beautifully to +fEm.

For this reason, conventionally, it has been proposed that the entire presser foot is made of transparent synthetic resin, but since synthetic resin has a high friction resistance of 1 bar and is easily worn out, the presser foot 11i has poor slippage and may cause minute patterns to break or become sharp. The drawback is that the feed dog and the bottom of the presser foot wear out in a short period of time due to rubbing against the cloth.

Therefore, it has been proposed to attach a thin iron plate to the bottom of the transparent synthetic resin partial lining, but even in this case, the synthetic resin part exposed on the bottom is easily worn out, and if used for a long time, the thin iron plate and The disadvantage was that it created a step at the border, making it impossible to send the 17 smoothly.

In addition, in both cases, the connecting shaft that attaches the presser foot to the holder at the end of the presser bar is made of metal separately from the presser foot, as it would lack strength if made of synthetic resin. Since it needs to be press-fitted into the insertion hole of the presser foot, not only is the manufacturing process complicated and many, but it is also necessary to keep a large number of connecting shafts of various diameters and lengths in stock, resulting in parts + 6.
It had the disadvantage of being complicated.

The present invention eliminates these conventional drawbacks by integrally casting the entire body of the presser foot and its connecting shaft from metal, and
By inserting the tip of the transparent resin part with a button hole into the empty space of the entire presser foot body that extends below the connecting shaft, and by fitting the entire presser foot body and the transparent resin part together, the transparent resin part can be removed during sewing. It allows the sewing 1J to be seen through, and also allows for smooth sliding between the fabric and the metal body.In addition, it simplifies manufacturing by omitting the conventional process of drilling the connecting shaft insertion hole and press-fitting the connecting shaft. Let's call it "one target."

The present invention will be explained based on an embodiment showing one side.
A shows the entire body of the metal presser foot, and B shows the transparent synthetic resin part that makes the hole l (Fig. 1).

A pair of left and right support pieces 2.2 are protruded from the ``-'' side of the main body A.
The connecting shaft 3 is horizontally suspended in the middle thereof.

As shown in FIG. 9, the connecting shaft 3 has both ends 3a, 3
Center a++ 3 Form a wider than b to supplement the strength.

Then, a holder 4 that is attached to the lower end of the presser foot of the sewing machine is provided with a pin 5 that can move forward and backward, and the holder 4 is attached to the
The presser foot is detachably connected to the holder 4 by inserting it between the support pieces 2.2 and making the tip of the detachable pin 5 project below the central portion 3b of the connecting shaft 3.

However, as shown in Figure 2.3, the center 7'' of main body A
B minutes? From the front blade to the bottom of the connecting shaft 3! , I.J.
At the same time, a pair of orange-shaped cloth presser pieces 7.7 whose tips are curved upward are formed along both left and right sides of the main body A, and a base end of the canvas presser piece is formed. is connected to the body weight by the base section 8 of the main body A.

A slanted surface 9 is formed on the front edge of the base 838 extending over the presser foot piece 7.7, and a guide groove IO is formed on the bottom surface of the base 8 along its center.

Also, the sides of the left and right presser pieces 7.7 are 17 mm when viewed from the plane.
Recessed portions 12 and 12 are formed through the mouth-shaped stepped portion 11 that opens inwardly. Reference numerals 13 denote curved portions forming both left and right ends of the sword drop hole 1.

And support J4' from the left and right distance of h presser piece 7.7
2.2, narrow the left and right spacing, and press IIJ presser 7.7
One end of the support piece 2.2 is protruded 11" from the stepped part bordering on the inner surface of the support piece 2.2, so that the downward 1'il + upper part protrudes into the cavity 6 for inserting the resin part. A pair of left and right blood prevention plates 14.14 are formed adjacent to the rear of the concave portion 12.12 along the inner edge of the presser piece 7.7.

15.15 is 2i adjacent to the front blade of the recessed part 12.12.
j It shows an eave-like engagement protrusion protruding from the inner surface of the presser piece 7.7.

In order to manufacture this metal mold presser body A, a casting song is required.
- The joint +ri x -x between the mold and the lower mold is raised by penetrating the cavity 6 for inserting resin oil only in the part of the connecting shaft 3, as shown in FIG. Align it with the horizontal plane 1-. Then, by injecting and filling the gold 4 (!!) with a metal such as heated and molten zinc alloy, the entire presser foot main body A in which the connecting shaft 3 is integrally horizontally suspended between the support pieces 2 and 2 is completed as described above.

Next, the surface of this main body A is polished with an abrasive material, and the mold is joined +
The burrs generated at T+i x -x are removed and the whole is reduced to 1 to 1.

Next, a transparent synthetic resin 8I that matches the shape of the resin oil insertion space 6 of the main body A! B is separately manufactured by a known manufacturing method,
If the thickness is made equal to the thickness in the guide groove 10 of the main body A>at 8), only the left and right wings of the resin portion B are made thinner.

The synthetic resin part B may be completely transparent or semi-transparent as long as it can be seen through, and if it is colored lightly red or blue within the range that can be seen through, it is convenient to be able to immediately identify different types of presser feet. be.

A thread introduction hole 16 reaching the neck 1 hole 1 is bored in the center of the resin part B, and 11"L of the thread introduction hole 16 is the height H of the left and right engaging protrusions 15 that sink into the main body At. It is longer than 1 force and is more than the sum of them (5th IF).

To assemble the synthetic resin part B to the entire metal mold press main body A, connect the ends of the resin part B to the left and right supports from the do side of the connecting shaft 3).
Insert between the pieces 2 and 2 and bring them into contact with the front edge of the main body 8, and insert a part of the hip 1 of the resin part B into the groove 14. 11" of the thread introduction hole 16 is pressed against the elasticity of the resin part B for 11h.
1 to 1, the left and right wings of the resin part B are fitted into the recessed part 8, and the left and right sides of the other end of the resin part B are engaged with the engagement protrusions 15, whereby the resin part B is attached to the main body A. It fits into the cavity 6 for inserting resin oil.

Here, L of the thread introduction hole 16 is narrower than the sum of the heights H of the left and right engaging protrusions 15, and even if the 11 thread introduction holes 16 are completely compressed and the inner walls of the thread introduction hole are brought into close contact with each other, Left and right engagement protrusions 1
5 can only be mounted on the same 14th position, so it is necessary to lock either the left or right one in sequence, but on the other hand,
Once locked, there is an advantage that the resin part B will not fall off from the engaging protrusion 15.15.

Therefore, the thickness of the resin portion B is equal to the thickness at the center of the base portion 8 of the main body A, that is, the thickness at the guide groove lO of the base portion 8, so that the bottom surface of the resin portion B is lower than the bottom surface of the presser piece 7.7. is also high (Figure 5).

The concave portion 12.12 and the stepped portion 11. But the resin part B is that! Support against external forces that act in two directions. Similarly, the 1-direction inclined surface 9 of the base portion 8 supports the resin portion B against external forces in the F direction, and the engaging protrusions 15 and 15 support the resin portion B against external forces in the −1, 1, and downward directions.

In short, the presser foot of the present invention has a metal mold presser body A.
and a transparent synthetic resin part B, the main body A is provided with a connecting shaft 3 that extends horizontally between a pair of left and right support pieces 2 and 2 that protrude from the upper surface of the main body A, and the resin part B has a needle droplet 1. A thread introduction hole 16 communicating with this is formed at 41, and the center portion of the main body A is cut out from the front to a position below the connecting shaft 3 to form a cavity 6 for inserting resin oil, and the tip is A pair of 4j presser pieces 7.7 (curved in the 1-direction) are formed along both left and right sides of the main body A, and the base end of the 1iii cloth presser piece is attached to the main body A.
are integrally connected by the base portion 8 of the 4j presser piece 7.
．． 7 (7)''-11i Niha concave part 12.12 On the inside edge of the mat, there is a floating 1 = lil stop surface 14.14
and engaging protrusions 15 and 15 respectively protrude into the cavity 6 for inserting resin oil, and furthermore, the I
Drill the guide groove 10 in the center, and then insert the resin part B into the resin oil. : Form the same shape as the C part 6 and its wall thickness) 1 ("Form the bottom 1nj of the piece 8 to the same thickness as the centerpiece and make the resin 7jl/, This resin part B is made higher than the bottom surface of the floating barrier surface 14.7.
14, and also fits into the concave portion 12.12 and the engagement protrusion 15.15 to integrally fix the resin part B in the resin oil insertion cavity 6 of the main body A. shall be.

Therefore, according to the presser foot of the present invention, the periphery of the four holes 1 can be clearly seen through the transparent synthetic resin part B.
You can accurately sew a zigzag pattern while watching the seams during M, and the bottom of resin part B is attached to the presser foot piece 7.7.
Since the cloth is not strongly pressed higher and the cloth is mainly pressed by the metal cloth presser piece 7.7 having a small coefficient of friction, there is an effect that the sliding of (A) is good and the resin part B is not worn out.

In addition, there is a concave portion 12 formed on the main body A, and one surface 14 on the floating portion 1.
The engaging protrusions 15 cooperate with each other to securely fix the resin part B in the space 6 in an immovable state.

In the manufacturing method of the present invention, the joint 1fiJX-X between the mold 1 and the mold D of the casting mold is pushed above the cavity 6 for inserting the resin part and raised higher than the first surface of the main body. Since the entire metal presser body A with the connecting shaft 3 integrally suspended between the pair of left and right support pieces 2, 2 protruding from the upper surface of the main body is cast, the entire presser foot body A with the connecting shaft 3 is cast in step 1. This eliminates the need to manufacture the connecting shaft separately from the presser foot, or to drill insertion holes in the support piece 2.2 for inserting the connecting shaft, as in the past, greatly simplifying the manufacturing process [1] This has the effect of shortening the time and improving productivity.

In addition, in the present invention, the synthetic resin part B is molded separately from the entire metal mold presser body A, and this is inserted into the resin part insertion cavity 6 of the main body A, so the main body A is placed in the synthetic resin molding die. Compared to the method of molding the resin part B integrally with the main body A by placing the resin part B in the same position, the lower part of the connection 1111+3 can be closed by the resin part B by inserting one end of the resin part B deeper than the connection shaft 3 until it is pulled out. , follows -(A) has the effect that there is no problem with the sliding of the resin part A, and there is no occurrence of climbing on the interface between the main body A and the resin part B.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view of the presser foot according to the present invention, showing how it is used, Figs. 2 and 3 are Fig. 1m of the entire main body of the metal presser foot, Fig. 2 is a perspective view of its top surface, and Fig. 3 is a perspective view of the presser foot according to the present invention. 4 is a plan view of the presser foot shown in FIG. 1, FIG. 5 is a cut end view taken along the v-'v line in FIG. 4, and FIG. 6 is the metal mold shown in FIG. 4. A plan view of only the entire presser foot body, Figure 7 is the same as ■-■ in Figure 6.
FIG. 8 is a sectional view taken along the line ■--■ in FIG. 6, and FIG. 9 is an enlarged perspective view of the connecting shaft in the embodiment of the present invention, with 1% 41j thereof cut away. Agent Tetsube Maki (and 2 others) Figure 1 Figure 4 Figure 5 HL)-1 Figure 6 I! 1117 Figure 9 Teito completion ++Fll original (spontaneous) +1? (May 191, 1985) Commissioner of the Japan Patent Office 1, Indication of Patent Application No. 69740 of 1982 2, Name of the invention Sewing machine presser foot and its manufacturing method 3, Relationship with the amended person's case Applicant 4, Agent 5, Subject of amendment Drawing 6, Contents of amendment The drawing No. 3 is amended as shown in the attached sheet. Tekei Sales ♀ City Authorization (spontaneous) 1. Indication of proposed matter Patent Order No. 1988 69740 No. 2, Name of the invention Sewing machine presser foot and its manufacturing method 3. Relationship with 211 cases of person who makes a presser foot for a sewing machine 1'i' Akinobu Precision Machinery Co., Ltd. 44 Agent Sakuragaoka, Shibuya-ku, Tokyo Town 14-5-101 <: (1) Revise page 7, line 13 of the specification, "Shipping F-Gero." to "Shipping 1. Further plating treatment." (2) Specification No. Page 8, line 14, ``in part 8'' is corrected to ``in part 2 J.''

Claims (1)

[Claims] 1. Metal presser foot entire body (A) and transparent synthetic resin part (B)
The main body (A) includes a pair of left and right support pieces (2) protruding from the top surface of the main body (A), and a connecting shaft (
3), the resin part (B) has a button hole (1) and a thread introduction hole (16) that communicates with the button hole (1), and the main body (A) has a connecting shaft (3) at its center from the front. When the hollow space (6) for inserting the resin cloth is formed by cutting down to the lower part of the presser foot (7), a horizontal presser foot (7) with the tip curved upward (7) is formed.
) are formed along both left and right sides of the main body (A), the base ends of both the presser pieces are integrally connected by the base section (8) of the main body (A), and the presser pieces (7), (7) has concave portions (12), (12) on the upper surface, and downward 11 upper IF surfaces (14), (14) and engagement protrusions (15) on the inner edge;
A guide groove (10) is provided in the center of the bottom of the base portion (8), and then the resin portion (B) is formed in the same shape as the resin cloth insertion space (6), and its thickness is The resin part (B
) is higher than the bottom of the presser foot pieces (7) and ('7), and press this resin r? 8 (B) Floating” two blocking surfaces (14),
(14) and the recessed portions (12) and (1).
2) and the engaging protrusions (15), (15) to fix the resin part (B) integrally in the resin cloth insertion cavity (6) of the main body (A). Sewing machine presser foot. 2. Hold down the joining surface (X - raise it higher,
This allows a pair of left and right support pieces (
2) Cast the entire body of the metal presser foot (A) with the connecting shaft (3) horizontally suspended between them, and attach the button hole (1) and the fat part (B) to the resin part. After molding to the same shape as the insertion cavity (6) and polishing the surface 1nj of the main body (A), the thread introduction hole (16) 111 is compressed against the elasticity of the resin part (B). The synthetic resin part (
A method for manufacturing a presser foot for a sewing machine, characterized by inserting the presser foot B) and fitting it into the main body (A).