JPH05123473A - Presser level regulator of sewing machine with embroidery function - Google Patents

Abstract

PURPOSE:To regulate finely the presser level of a sewing machine, and set the level properly according to the density of the thickness and pattern of an embroidery cloth piece. CONSTITUTION:In a vertically moving mechanism to be interlocked with upper axis rotation, set in a sewing machine B with embroidery function having an X-Y driving section 13, the angle position of a rod 5 to be transferred is contrived to be variable with the rotational movement of a cam shaft 1 to be connected to a regulating knob 11. The presser level (c) of a presser rod 9 to be interlocked with the end of the rod 5 to be transferred can be properly regulated. By using this device, due to the thickness and sort of a cloth sheet to be sewn, or the density of embroidery, stitch-skipping, stitch-damage, poor stitch-tightness, and the like can be prevented from being generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention adjusts the presser foot height of a sewing machine with an embroidery function so that the presser foot height of a sewing machine with an embroidery function can be adjusted appropriately according to the thickness and pattern density of the cloth for embroidery. Regarding the device.

[0002]

2. Description of the Related Art A sewing machine having an embroidery function has been known which raises a presser foot with respect to movement of an embroidering cloth. In the sewing machine with the embroidery function, the lifting of the presser foot is started at a constant phase, and therefore, the height position of the presser foot is not finely adjusted according to the thickness of the embroidering cloth.

[0003]

However, since the height position of the presser cannot be finely adjusted, and the start of rising of the presser from the top of the needle plate is constant, when the embroidering cloth is thick, As shown in FIG. 12, the delay time T for actually lifting the presser from the embroidering cloth by the height of the cloth thickness ΔH from the start of rising from the needle plate upper surface depends on the cloth thickness. It will be.

Then, assuming that the presser foot rises at a predetermined cloth thickness and setting is made so that the embroidering cloth starts to move, if the cloth has a certain thickness or more, the delay time T
Therefore, if the hoop starts moving slightly before this time, the hoop will move while the embroidery section is being pressed by the presser foot, causing stitch skipping, seam damage, and poor threading. There was a drawback to

[0005]

Therefore, as a result of intensive studies, the inventor of the present invention has found that the invention provides an upper shaft rotation provided on a sewing machine with an embroidery function having an XY drive section. In the presser up-and-down movement mechanism that interlocks with, the angular position of the transmitted rod can be changed by turning the cam shaft that can be connected to the adjustment knob, and the presser bar height that interlocks with the end of the transmitted rod can be adjusted appropriately. By adjusting the presser foot height adjustment device for sewing machines with embroidery function, the presser foot height of the sewing machine with embroidery function can be finely adjusted to appropriately correspond to the thickness of the cloth and the density of the pattern. It is a solution to the problem.

[0006]

Embodiments of the present invention will be described below with reference to FIGS.

3 to 6 show a height adjusting mechanism. Reference numeral 1 denotes a cam shaft, which is formed of a large diameter portion 1a and a small diameter portion 1b, and the axis core of the large diameter portion 1a and the axis center of the small diameter portion 1b are not on the same line and are separated from each other by a distance Δh.

Reference numeral A is a compound rocking rod, which is composed of an operating piece 2, a movable piece 3 and a transmitting piece 4 connecting them, and the operating piece 2 is transmitted with a vertical motion by a presser operating cam 10b. The vertical movement is transmitted to the movable piece 3 via the transmission piece 4.

Reference numeral 5 denotes a transmitted rod, which is a presser link 8
And a transmitted surface 5b is formed at one end of the transmitted rod 5 so as to receive the vertical movement from the tip of the movable piece 3 of the compound rocking rod A. Is becoming

The composite rocking rod A and the transmitted rod 5 are provided on the cam shaft 1, and more specifically, the composite rocking rod A.
The operating piece 2 and the movable piece 3 are rotatably provided on the large diameter portion 1a, and the transmitted rod 5 is rotatably provided on the small diameter portion 1b. That is, the actuating piece 2 and the movable piece 3 of the compound rocking rod A are provided with large through holes 2a and 3a which are substantially the same as the large diameter portion 1a of the cam shaft 1, and the transmitted rod 5 has a small diameter portion 1b. A small through hole 5a that is substantially the same as is formed.

Furthermore, the large through holes 2a, 3 of the compound rocking rod A are provided.
“A” is in a substantially loose insertion state in the large-diameter portion 1a of the cam shaft 1, and the small through hole 5a is in a substantially loose insertion state in the small-diameter portion 1b.

The composite swing rod A and the transmitted rod 5 are constructed such that the transmitted rod 5 is adjacent to the movable piece 3 side of the complex swing rod A (including the proximity state), and they are appropriately arranged on the cam shaft 1. The tip of the movable piece 3 and the tip of the transmitted rod 5 are movably connected to each other. A coil spring 6a is used as the connecting means 6.

Another embodiment of the connecting means 6 is shown in FIG.
As shown in FIG. 5, the pin 6b and the long hole 6c are formed, the long hole 6c is formed in either one of the movable piece 3 or the transmitted rod 5, and the long hole 6c is formed in the other. 6
The movable piece 3 and the transmitted rod 5 are connected to each other at their distal ends by being slidably inserted into c.

Further, a connecting means 6 for connecting the movable piece 3 and the transmitted rod 5
A protrusion 7 is formed near the location, and the movable piece 3 and the transmitted rod 5
There may be a case where an appropriate interval is formed at the tip of the. The aforementioned height adjusting mechanism is incorporated in the sewing machine head B ₁ of the sewing machine B with an embroidery function.

The transmitted rod 5 has a presser link 8 on the other end side of the small diameter portion 1b of the cam shaft 1 centered on the pivotally supported portion.
Further, the presser link 8 is pivotally supported by the presser bar 9, and the presser link 8 is vertically moved to the presser bar 9 from the presser actuating cam 10b via the composite swinging rod A and the transmitted rod 5. It transmits the movement of.

In the height adjusting mechanism, there is provided an adjusting knob 11 protruding from one end of the cam shaft 1 to the outside of the main body of the sewing machine B with an embroidery function, and specifically, the adjusting knob 11 is provided on the small diameter portion 1b. Will be provided (see FIG. 1).

The height adjusting mechanism includes a presser bar 12 at the lower end of the presser bar 9.
The vertical height of the
It will be described with reference to FIG.

First, the adjusting knob 11 is appropriately rotated to rotate the cam shaft 1 in an appropriate angle range. In the illustrated embodiment, the angle is θ.

As the initial position of the camshaft 1, the small diameter portion 1b is used.
The center O ₁ and the center O ₂ of the large diameter portion 1a are on a vertical line, and the center O ₁ is below the center O ₂ .

When the camshaft 1 rotates by the angle θ, the center O ₂ of the large diameter portion 1a is lowered below the initial position and the large diameter portion 1a is moved downward.
a will move downward (see FIGS. 9 and 10).

With the downward movement of the large-diameter portion 1a, the compound rocking rod A maintains a state in which one end of the operating piece 2 is in contact with the pressing operation cam 10b fixed to the upper shaft 10a. Meanwhile, both the operating piece 2 and the movable piece 3 are lowered together with the large diameter portion 1a (see FIG. 8).

The movable piece 3 of the composite rocking rod A moves downward, and at the same time, the transmitted rod 5 is rotated about the small diameter portion 1b of the cam shaft 1 via the contact point with the transmitted rod 5. However, the contact side with the movable piece 3 is lowered downward, and the presser link 8 side is moved upward, and the adjustment of the presser height c is completed. That is, the presser height c is a clearance value between the bottom dead center of the vertical movement of the presser bar 9 and the needle plate surface (see FIG. 8).

As described above, when the adjusting knob 11 is not rotated, the height of the presser bar 9 becomes the position of the solid line in FIG. 2 (chain line in FIG. 8), and the adjusting knob 11 is rotated by the angle θ. By rotating, the height of the presser bar 9 becomes the position of the chain line in FIG. 2 (solid line in FIG. 8), and the presser height c changes.

By the vertical movement of the presser bar 9 by the presser actuating cam 10b, the position where the height adjustment is completed becomes the bottom dead center, and the ascending start phase of the presser is adjusted.

The sewing machine B with an embroidery function is classified into an embroidery sewing machine capable of embroidering only and a compound embroidery sewing machine capable of normal sewing and embroidery sewing. This sewing machine B with an embroidery function has a computer program installed in advance and is configured to be able to perform various embroidery stitches by a control device including a central processing unit (CPU).

This sewing machine B with an embroidery function is shown in FIG.
As shown in FIG. 3, an XY drive unit 13 is provided, and the XY drive unit 13 is provided.
The X motor and the Y motor controlled by the drive unit 13 are driven, the end of the carriage body 13a is exposed to the outside, and the carriage body 13a is provided so as to be appropriately movable in the XY directions. An embroidery frame 15 is attached to the end of the carriage body 13a via an attachment 14.

[0027]

According to the present invention, a knob for adjusting the angular position of the transmitted rod 5 is provided in the presser up-and-down moving mechanism that interlocks with the rotation of the upper shaft 10a provided on the sewing machine B with an embroidery function having the XY drive section 13. A presser foot height adjusting device for a sewing machine with an embroidery function, which is made variable by the rotation of a cam shaft 1 connectable to 11 and which can appropriately adjust a presser foot height c of a presser bar 9 which is interlocked with an end of a transmitted rod 5. As a result, the first advantage is that it is possible to reliably avoid the occurrence of thread misalignment and skipped stitches, depending on the thickness and type of the cloth to be sewn on or the density of the embroidery. There is an advantage that sewing can be performed at high speed, thirdly its operation is simple, and fourthly, the structure is simple and can be provided at low cost.

These effects will be described in detail. The angular position of the transmitted rod 5 is changed by rotating the cam shaft 1 which can be connected to the adjusting knob 11, and the presser height of the presser bar 9 of the presser vertical movement mechanism is changed. By appropriately adjusting the height c, the angular position of the transmitted rod 5 can be varied by simply rotating the adjusting knob 11 to rotate the cam shaft 1, and thus the transmitted rod 5 end. The presser foot height c of the presser bar 9 which is interlocked with can be adjusted appropriately.

Therefore, the X of sewing machine B with an embroidery function
In driving the embroidery frame 15 provided on the carriage body 13a of the Y drive unit 13, when a thick cloth is sewn, the presser height c is increased by the adjusting knob 11 to increase the presser foot 1
The rising start phase of 2 can be adjusted, and at the same time as the lifting of the presser bar 9, the presser foot 12 of the embroidery part is released, and the hoop 1
Since there is no hindrance to the driving of the driving device 5, it is possible to prevent the occurrence of skipped stitches, damage to seams, defective thread jamming, and the like.

Further, conventionally, when the thickness of the embroidering cloth is thick, the movement start phase of the embroidery frame 15 must be delayed, and therefore, the rotation of the sewing machine B with an embroidery function is delayed. However, in the present invention, the embroidery start phase can be adjusted to increase the speed, which enables high-speed embroidery sewing.

Further, since the operation of the present invention is simple and the structure is simple, there is an advantage that it can be provided at a low cost.

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a sectional view of an essential part of the present invention.

FIG. 3 is a perspective view showing a main part member of the present invention.

FIG. 4 is a sectional view of FIG.

5 is a side view of FIG.

6 is an exploded perspective view of the main members of FIG.

7 and 8 are side views showing the operating state of FIG.

FIG. 9 is a sectional view of a cam shaft portion

FIG. 10 is a sectional view of the rotating state of the cam shaft.

FIG. 11 is a perspective view of another embodiment of a part of the work clamp vertical movement mechanism.

[Fig.12] Relationship between the time of the presser foot and the hoop and the rising position with respect to the cloth thickness

[Explanation of symbols] 1 cam shaft 5 transmitted rod 9 presser bar 10a upper shaft 11 adjusting knob 13 XY drive unit B sewing machine with embroidery function c presser height

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuhiro Nagauchi 3-1-1 Kyobashi, Chuo-ku, Tokyo Jamme Sewing Machinery Co., Ltd. (72) Inventor Takayuki Kawasato 3-1-1 Kyobashi, Chuo-ku, Tokyo In the Janome Sewing Machine Co., Ltd. (72) Inventor Yukio Hosaka 3-1-1 Kyobashi, Chuo-ku, Tokyo In the Janome Sewing Machine Co., Ltd. (72) Koichi Asai 3-1-1 Kyobashi, Chuo-ku, Tokyo Janome Sewing Machine Kogyo Co., Ltd. (72) Inventor Yoshiyoshi Toyoshima 3-1-1 Kyobashi, Chuo-ku, Tokyo Janome Sewing Machine Co., Ltd. (72) Inventor Kiyoshi Amano 3-1-1 Kyobashi, Chuo-ku, Tokyo Janome Sewing Machinery Co., Ltd. In the company

Claims (1)

[Claims] 1. A rotation of a cam shaft capable of connecting an angular position of a transmitted rod to an adjusting knob in a presser up-and-down movement mechanism provided with an embroidery function sewing machine having an XY drive unit and interlocking with rotation of an upper shaft. A presser foot height adjusting device for a sewing machine with an embroidery function, wherein the presser foot height of the presser bar that is interlocked with the transmitted rod end can be adjusted appropriately.