JPH0354597B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a core string guide for guiding the core string in front of the needle in the cloth conveyance direction in a hole sewing machine in which a core is sewn into the seam. Regarding the mechanism.

[Prior art and its problems] Conventionally, this type of core string guide mechanism, as shown in FIGS. 5 and 6, includes a rotary arm 2 rotatably supported on a machine frame by a shaft 2; A cylindrical core string guide 3 provided at the tip of the core string guide 3 is provided, and the core string I supplied from a core string supply source (not shown) is guided by the core string guide 3 in front of the needle drop (in the fabric conveying direction). It is designed so that the core cord I can be sewn into the seam. Further, a hole sewing machine is usually equipped with a cloth presser plate 4 which presses the area around the sewing part of the cloth, that is, the area around the buttonhole, and is movable up and down by an elevating arm 5.

The rotating arm 2 is the lifting arm 5.
It is designed to rotate in the vertical direction in cooperation with the lifting and lowering of the core string guide 3, and the core string guide 3 is also moved according to changes in the fabric thickness.

[Means for solving problems]

However, in the conventional core string guide mechanism of the upper machine, since the core string guide 3 moves in an arc centered on the shaft 1 as shown in FIG. 5A, when the fabric W is thick, As shown in Fig. 6, the core string guide 3 is located in the needle drop path R, and the needle and the core string guide 3 interfere with each other during sewing, resulting in needle breakage and damage to the guide 3. There was a problem.

The present invention has been made in view of the above-mentioned problems, and aims to provide a core string internal mechanism that allows the core string guide to be raised and lowered according to the thickness of the fabric without interfering with the needles.

[Summary of the invention]

In this invention, a movable arm that holds a core string guide is formed with a long hole extending in the longitudinal direction thereof, and the core string guide is supported by a support shaft inserted through the long hole. A cam plate having a predetermined slope is provided on the string guide, a locking member is provided at a position facing the slope of the cam plate, and the cam plate is brought into contact with the locking member by a biasing member. The movable arm is biased and rotated about the support shaft in response to the lifting and lowering of the presser plate.

[Effect]

In this invention, when the presser plate moves up and down, the movable arm rotates about the support shaft, but the movable arm is urged by the spring so that the cam plate and the locking member are always in contact with each other. Because of this, it rotates while constantly changing its relative position to the spindle.
The guide member moves up and down vertically.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.
This will be explained based on the diagram.

In the figure, reference numeral 6 denotes a movable arm, and a long hole 6a extending in the longitudinal direction is formed in the center of the arm, and a support shaft 7 is movably inserted into the long hole 6a. The support shaft 7 is threaded onto a mounting member 9 rotatably attached to the lower end of a support rod 8 held in the machine frame. Reference numeral 10 denotes a holding plate fixed to the front of the movable arm 6, and an L-shaped rod 11 is attached to the tip thereof. Reference numeral 12 denotes a tubular core string guide member held at the tip of the rod 11, through which the core string I fed from a supply source (not shown) is inserted. Reference numeral 13 denotes an engagement plate fixed to the front of the movable arm 60, and an engagement groove 13a is formed at the tip thereof. Reference numeral 14 denotes a frame-shaped cloth press plate that presses the area around the button hole of the cloth W placed on the throat plate 15, and is fixed to the tip of a presser arm 16, which is linked to a main cam (not shown). The presser plate 14 is horizontally moved back and forth, right and left, and rotated up and down about a fulcrum not shown. Further, the engagement groove 13 of the engagement plate 13 is provided at the tip of the presser arm 16.
A protruding engaging pin (connecting member) 16a that engages with a is provided, as well as a rod 17 that is urged downward by a spring (not shown), and the urging force applied to the rod 17 is As a result, the cloth pressing plate 14 presses the cloth W placed on the throat plate 15.
Reference numeral 18 indicates a mounting plate protruding from the side surface of the rear portion of the moving arm 6, and reference numeral 19 indicates a screw 20 provided on the rear surface of the mounting plate 18.
The cam plate is fixed at
a is formed. Reference numeral 21 denotes an inverted L-shaped forward/backward switching lever which is attached to a support base 22 fixed on the machine frame so as to be rotatable about a shaft 23, and at its upper end there is a roller 21a (engaged) facing the slope 19a. A joint part) is produced. Reference numeral 24 denotes a double shaft that can be rotated independently of each other, and the outer shaft 24b is provided with a lever operating arm 25. This arm 25 is a roller provided at the side end of the forward/reverse switching lever 21 21b. Also, double shaft 2
A roller plate 27 having rollers 26 is disposed on the inner shaft 24a of 4.
is fixedly installed, and as the roller plate 27 rotates, the roller 26 presses the lower end of the mounting plate 18,
The movable arm 6 is rotated horizontally about a support rod 8.

A spring 28 serves as a biasing member interposed between the engagement plate 13 and the mounting member 9, and urges the movable arm 6 rearward together with the engagement plate 13.

The operation will be explained based on the above configuration.

During sewing, the fabric W is conveyed by the cloth presser plate 14, and during this time, the core cord guide 12 must always be located in front of the needle drop point in the cloth conveyance direction. 12 also performs the sewing operation while horizontally moving back and forth, right and left, in accordance with the switching of the cloth conveyance direction. Note that the movement of the cord guide 12 back and forth and left and right is performed by each shaft 24 of the double shaft 24.
This is done by rotating the main cams a and 24b, respectively. That is, when the outer shaft 24b rotates and the lever operating arm 25 rotates upward, the forward/reverse switching lever 21 rotates clockwise around the shaft 23, and the roller 21a of the switching lever 21 rotates.
presses the slope 19a to move the moving arm 6 forward. Furthermore, when reversing, the outer shaft 24b rotates in the opposite direction, causing the lever operating arm 25 and the switching lever 2
1 is reversely rotated, and the movable arm 6 is moved backward by the biasing force of the spring 28.

Further, for movement in the left and right direction, as described above, the inner shaft 24b is rotated by the main cam, and the lower end of the mounted 18 is pressed by the rollers 26, so that the movable arm 6 is moved around the support shaft 8. This is done by rotating horizontally around the center.

By the way, if the presser plate 14 is now moved upward, the moving arm 6 is moved around the support shaft 7 as a fulcrum by the engagement pin 16a engaged in the engagement groove 13a of the engagement plate 13, as shown in FIG. Rotate counterclockwise. Therefore, at this time, assuming that the relative position between the movable arm 8 and the support shaft 70 does not change, the core string guide 12 moves up in an arc centered on the support shaft 7,
It will pass through the needle drop path R as before,
There is a possibility that the needle and the core string guide 12 may interfere with each other.

However, when the movable arm 6 rotates counterclockwise and the cam plate 19 moves downward, the movable arm 6 is biased backward by the spring 28, so that the movement occurs as shown in the dashed line in FIG. Follow the slope 19a of the cam plate 19 to the rear, that is, the needle drop path R.
Move in the direction of separation from. Therefore, two contradictory movement components, the movement in the direction of the needle drop path due to the rotation of the movable arm 6 and the backward movement due to the spring 28, are combined and act on the core string guide 12, and as a result, both movement components act on the core string guide 12. The components cancel out and the core string guide 12 rises vertically. Furthermore, when the work presser plate 14 is lowered, the movable arm 6 moves, contrary to the above-mentioned upward rotation.
The core string guide 12 is pushed forward by the slope 19a of the cam plate 19, and this is offset by the movement caused by the rotation of the moving arm 6, so that the core string guide 12 descends vertically.

In this way, the core string guide 12 in this embodiment
, vertically rises and falls as the presser foot plate 14 rises and falls, so that the distance from the needle drop path R is always kept constant even when the thickness of the fabric varies as shown in FIGS. 2 and 3. This allows for proper core string guidance without interference with the needle.

〔Effect of the invention〕

As explained above, according to the present invention, the core string guide does not interfere with the needle for any thickness of cloth, and the core string can be guided safely and reliably.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention, FIGS. 2 and 3 are side views of the device shown in FIG. 1, FIG. 4 is an explanatory view of the operation of the device shown in FIG. 2, and FIG. FIG. 6 is a side view showing a schematic configuration of a conventional core string guide mechanism. 6... Moving arm, 12... Core string guide, 16a... Engaging pin (connecting member), 14... Cloth press plate, 19... Cam plate, 19a... Slope, 21a... Roller (locking member),
28...Spring (biasing member).

Claims (1)

[Scope of Claims] 1. A moving arm having a long hole extending in the longitudinal direction and capable of rotating and moving in the longitudinal direction by a support shaft inserted through the long hole; and this moving arm. A core string guide provided at one end and guiding the core string supplied from a predetermined supply source in front of the needle in the conveyance direction; and a core string guide provided on the side surface of the moving arm at a predetermined angle with respect to the longitudinal direction of the moving arm. a cam plate having a slope sloping at an angle, a locking member provided at a position opposing the slope of the cam plate, a biasing member urging the cam plate to abut the locking member; A hole stitching machine comprising: a cloth presser plate that is movably and vertically movable and presses the cloth placed on the throat plate; and a connecting member that transmits the vertical movement of the cloth presser plate to the movable arm. Core string guide mechanism in sewing machines.