JPH0135744Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a safety device for the upper looper stop mechanism of a lock sewing machine.

[Conventional technology]

In the conventional two-needle, multi-thread lock sewing machine,
FIG. 3 shows a front view of an example of a release mechanism for selectively stopping the operation of the upper looper depending on the sewing pattern specifications of a specific part of the sewing product work.

The diagram shows the operation of the looper at the bottom of the front of the lock sewing machine.
FIG. 2 is an explanatory diagram of main parts of the entire release mechanism. Lu is an upper looper, L1 is a lower looper, and the upper looper Lu includes a release arm 1 fixed to the operating shaft 4, an upper looper swinging arm 3 mounted on the operating shaft 4 so as to be freely rotatable;
A release lever 2 is pivotally attached to the base of the swinging arm 3 by a pin 7 so as to be able to pivot at a predetermined angle, and is always releasably engaged in a fitting groove 1a formed in the release arm 1; , a connecting rod 5 pin-coupled to the tip of the upper looper swinging arm 3 is configured to perform a predetermined movement.

Since the release lever 2 is always engaged in the recess 1a of the upper looper release arm 1, the swinging motion of the operating shaft 4 is caused by the upper looper release arm 1 and the release lever 2. It is directly connected to the moving arm 3 and is caused to perform a predetermined upper looper Lu movement via the rod 5 (upper looper swinging arm swing angle θ between 3 and 3').

On the other hand, an escape hole 6 is provided at a predetermined position on the wall surface F of the machine frame of the sewing machine to allow release of the release lever 2.
is recessed, and the release lever 2 is prevented from being released in any position other than this position. The reason for this is that if the release is performed at a position other than this, for example an intermediate position where the tip of the upper looper swinging arm 3 has risen above the bottom dead center, the upper looper Lu may interfere with the lower looper L1 and cause damage. This is to cause

In addition, Fig. 4 is a vertical sectional view of the escape hole 6, and Fig.
The figure is a perspective view showing the normal engagement state of the release lever 2.

[Problem that the invention attempts to solve]

However, in the conventional upper looper stopping mechanism as described above, when the sewing work with the upper looper Lu in the resting state is completed and the upper looper Lu is to be restored to the normal working state again, as shown in FIG. As shown in FIG. 2, the release lever 2 pivotally attached to the upper looper swinging arm 3 should be correctly re-inserted into the recess 1a of the release lever 1, but it is mistakenly inserted into the recess 1a of the release lever 1.
Assuming that the release arm 1 is engaged with the upper surface part in the state shown in the figure, if the operator starts the sewing machine without noticing and the operating shaft 4 starts a predetermined swinging movement, the upper looper release arm 1 will move in the direction of the arrow. When it rotated in the direction A, its upper surface collided with the release lever 2, potentially damaging these related parts.

This idea was devised in view of the problems of the conventional method as described above. When releasing the upper looper from rest, if the release lever is erroneously moved and the upper looper is released in the state shown in Figure 6. Even if the release lever is engaged with the upper surface of arm 1, or even if the release lever comes to the above position for some reason, the incorrect engagement of the release lever 2 with the upper looper release arm 1 is automatically released. The purpose is to provide safety measures to ensure that

[Means for solving problems]

Therefore, in this invention, the upper surface of the upper looper release arm is formed in a shape that slopes downward toward the tip, and the lower edge of the release lever where it starts to engage with the recessed groove is rounded. ,
The purpose is to achieve the above objectives.

[Effect]

With the above configuration, if the release lever accidentally attempts to engage the upper looper swinging arm in an incorrect position when attempting to release the upper looper stop mechanism or for some other reason, the lower part of the release lever The roundness of the edge comes into contact with the inclined surface of the upper surface of the swinging arm of the upper looper, and as the sewing machine needle restarts,
Due to the rocking motion of the operating shaft, the inclined surface operates to push the release lever back in the release direction, and the release lever is automatically released again, thereby avoiding component damage as described above.

〔Example〕

This invention will be explained below based on examples.
Figures 1a and b are respectively a top view and a front view of the essential parts of the safety device of the upper looper stop mechanism according to this invention, and Figure 2 is a perspective view of the essential parts of the release lever in an incorrectly engaged state (conventional example). 6), and the same (equivalent) components as in FIGS. 3 to 6 of the conventional example are:
They will be represented by the same symbols, and duplicate explanations will be omitted.

(Structure) As shown in Figs. 1 and 2, the feature of this invention is that the upper surface of the concave groove 1a of the upper looper release lever arm 1 is formed into an inclined shape 1b that descends toward the tip. The planar shape of the release lever 2 has a contour as shown in FIG. The reason is that it has a smooth rounded shape. In addition, 2b is
The function of the convex portion provided on the release lever 2 will be described later.

Reference numeral 2c denotes a straight portion, and an angle plate spring 8 fixed to the upper surface of the base portion of the upper looper swinging arm 3 by a set screw 9 causes the release lever to be moved to the rotation angle position and the release position shown in FIG. 1a, respectively. 2 is maintained stably. 10 is a set screw for fixing the release arm 1 to the operating shaft 4.

(Operation) As shown in Fig. 2, in order to complete the upper looper pause and reproduce its operation, the release lever 2 is moved at the relief hole 6 position shown in Fig. 3.
When the upper looper release arm 1 is rotated in the direction of arrow -B in the figure to engage with the recessed groove 1a, the upper looper swing arm 3 may be rotated in the direction of arrow A due to its own weight, etc. If the operator starts the sewing machine without noticing the situation as shown in the figure, when the operating shaft 4 swings in the direction of arrow A, the lower edge rounded part of the release lever 2 will be moved by the inclined surface 1b. 2a comes into contact and is automatically released in the direction of arrow B, and the leaf spring 8 causes
Since the release lever 2 is returned to the release position and remains stably stationary, accidental damage to parts can be prevented.

(Other improved configurations) FIGS. 7 to 9 are explanatory diagrams of other improved configurations related to this invention.

7 and 8 show the release lever 2, respectively.
Safety is further increased by providing an inclined portion in the escape hole 6 (FIG. 4) for release operation.

Figures 7 and 8 are sequence diagrams explaining the operation, in which a is a top view of the main part, b is a front view thereof, and c is a cross section of the machine frame wall F of the relief hole H of the release lever 2. It is a figure which shows each shape. Both figures c
As shown in the figure, a sloped portion S is provided immediately in front of the escape hole H from the machine frame wall F portion.

With this improvement, if the release lever 2 is not in the released state at the relief hole H position or the locked state at the machine frame wall F position, but is in an intermediate position for some reason, the sewing machine cannot be used in this state. When the release lever 2 is activated, there is a high risk that the release lever 2 will come off the groove 1a of the upper looper release arm 1, leading to damage to the related parts mentioned above.This is an improvement proposal to prevent this.

That is, as shown in FIG. 7, when the release lever 2 is in the halfway incomplete position, the convex portion 2b of the release lever 2 (see FIGS. 1 and 2) and the inclined surface S on the machine frame wall surface are As the release arm 3 is engaged and rotated in the direction of arrow -A, the release lever 2 moves along the slope S, and the release lever 2 is operated to be pushed to a safe position even when the sewing machine is operated. do.

In other words, the reference surface F in the step part of the machine frame is the range where the release lever 2 cannot be released, the slope S is the range where the release lever 2 transitions from the release to the locked state, and the escape hole H is the range where the release lever 2 is completely released. This shows that.

Therefore, even if the operator does not return the release lever 2 to the normal position due to carelessness, when the release arm 1 rotates in the -A direction, the release lever 2 will automatically move in the -B direction. It is safe to return to.

Furthermore, FIGS. 9a and 9b show an improvement plan for ensuring that the release lever 2 is held in the released position.

Originally, this type of release method for the upper looper Lu was to release the release lever 2 and then use the weight of the upper looper swinging arm 3 to release the upper looper.
Since this is a method in which Lu is lowered and released, the upper looper Lu may inadvertently move up and down as the release arm 1 swings, due to the direct engagement between the release arm 1 and the upper looper swing arm 3. There is a risk of

In the conventional example, when in this release state,
If the operator accidentally touched the hand from the direction M in FIG. 9b, for example, there was a risk that the upper looper Lu and the lower looper L1 (FIG. 3) would interfere and damage them. Since the release lever 2 is formed with a convex portion 2b, it enters the relief hole H and the arrows A to A of the upper looper swinging arm 3
- Movement in the A direction is restricted, and the upper/lower looper Lu/
It is extremely safe because it can be stopped within a range where L1 does not interfere.

[Effect of idea]

As explained above, according to this invention, if the release lever attempts to engage the upper looper swinging arm in an incorrect position when attempting to release the upper looper stop mechanism of the lock sewing machine, the release lever is automatically In order to operate to return to the released position,
This makes it extremely safe and prevents damage to parts.

[Brief explanation of drawings]

Figures 1a and 1b are a top view and a front view, respectively, of the main parts of the safety device of the upper looper stop mechanism according to this invention;
FIG. 2 is a perspective view of a main part showing the release lever in an incorrectly engaged state, FIG. 3 is a front view of an example of the entire conventional upper looper stop mechanism, and FIG. 4 is a longitudinal cross-sectional view of the escape hole thereof. Fig. 5 is a perspective view of the main part showing the release lever in the normally engaged state, Fig. 6 is a perspective view of the main part in the incorrectly engaged state (corresponding to Fig. 2 of the embodiment), and Figs.
Figures a, b, and c each show a top view, a front view, and a cross-sectional view of the machine frame wall of the relief hole, respectively, showing operation sequence diagrams of other improvement examples. FIG. 7 is a perspective view showing an operation sequence of an improved example. 1...upper looper release arm, 1a...dent,
1b...Top inclined portion, 2...Release lever, 2
a...Lower edge rounded part, 3...Upper looper swing arm, 4...
...Operating axis, P...pin, Lu/L1...upper/lower looper.

Claims (1)

[Scope of utility model registration request] In a two-needle, multi-thread lock sewing machine, the upper surface of the upper looper release arm is formed to be inclined downward toward the tip, and the upper surface of the upper looper release arm of the release lever pivotally supported by the upper looper swing arm is A safety device for an upper looper stop mechanism of a lock sewing machine, characterized in that a lower edge at the start of engagement with an engagement groove is smoothly rounded.