JPS6363490A - Sewing machine - Google Patents

Abstract

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

Description

[Detailed description of the invention] The present invention aims to solve the following problems.

(Field of Industrial Application) The present invention relates to a sewing machine capable of sewing cloth, and more particularly to a sewing machine capable of performing jump stitching.

(Prior Art) In a conventional sewing machine, as shown in FIG. 10, a catch lever 33f is pivotally attached to a pro-tock 30f attached to a needle bar 12, and an engaging portion 35f of the lever 33f is connected to an elevating body. The needle bar 12f is engaged with the pin r)B of the 26f so that sewing is performed by vertically moving the needle bar 12f via the lever 33f and the block 30f due to the vertical movement of the elevating body 26f. 59-95
(Refer to Publication No. 093), when performing jumping, the interlocking relationship between the elevating body 26f and the lever 33f is adjusted as follows.
make it cut off.

(a) The lever 33f rises together with the elevating body 26f (10th
Figure (A)) (b) The slope 33f' comes into contact with the pin 30f'
3f tilts in the direction of arrow
(Fig. (B)) (d) The lever 33f descends as the elevating body 26f descends (Fig. 10 (C)) (e) The engaging surface 33r# is engaged with the via 30f' (Fig. 10 (C)) )(f) After that, only the elevating body 26f descends independently.

I! The interlocking relationship described above is interrupted by linking the movements of the mouth, the elevating body 26 [and the lever 33f]. For this reason, if the vertical movement of the elevating body 26f is performed at high speed and the timing of the operations (a) to (f) above is even slightly off,
For example, if the vertical movement of the elevating body 26f is fast, the lever 33f in (b) above may become uncoupled, making it impossible to interrupt the interlocking relationship described above.
As shown in the imaginary line in B), it was blown away, and for this reason, the descent in (d) was made before the return in (c) above was sufficient.
As a result, there was a problem in that the coherence in (e) was not achieved.

As a result, there was a problem in that jump stitching failed.

(Problems to be Solved by the Invention) This invention eliminates the above-mentioned conventional problems, and can not only perform normal sewing and jump stitching, but also perform normal sewing even when the elevating body moves up and down at high speed. The purpose of this invention is to provide a sewing machine that can reliably switch to flying stitches.

The configuration of the present invention is as follows.

(Means for Solving the Problems) The present invention takes the measures as described in the claims above, and its effects are as follows.

(Function) The movement of the WA drive member is transmitted from the elevating body to the driven body, and further transmitted from the driven body to the needle bar, causing the needle bar to move up and down.
Sewing is done with a needle. When the locking mechanism is actuated, transmission of movement from the elevating body to the driven body is cut off, the needle bar becomes inactive, and sewing is stopped.

(Example) Below are drawings 1 to 9 showing examples of the present invention.
The diagram will be explained. In FIG. 1, 1 is a machine frame of a sewing machine, 2 is a guide rod fixed to the machine frame 1, and 3 is a drive member. In this case, 4 is an upper shaft which is rotated in a well-known manner by a drive mechanism not shown. A crank mechanism 5 is connected to the upper shaft 4 and includes a drive plate 6 and a crank loft 7.

Next, reference numeral 10 denotes a holding frame for the needle bar, which is rotatably mounted on the machine frame l via the guide rod 2. This supports a plurality of needle bars 12, which will be described below, in a horizontally movable manner.In this example, the needle bars 12 can be rotated about the guide rod 2; It is also possible to do so. Reference numeral 11 denotes a driven part for switching the needle bar fixed to the holding frame 1O, which is operated by a switching mechanism not shown to allow the holding frame 10 to rotate around the X inner rod 2. 12 is the holding frame 10
A needle bar is shown attached to the needle bar so as to be able to move up and down, and a sewing needle 13 is attached to the lower end of the needle bar. 'L4 is a connector fixed to the upper part of the needle bar 12, and 15 is a fitting portion. 16 is a presser foot attached to the needle bar 12 so as to be able to move vertically; 17 is a presser foot portion; 18 is a biasing compression spring interposed between the connector 14 and the presser foot 16. 19 is a guide frame attached to the holding frame 10; 20 is a plurality of guide grooves;
, is provided to guide the vertical movement of the presser foot 16. 21. 21 is a holding frame fixed to the machine frame 1, which is designed to hold the needle bar that is not used for sewing work (in standby state) in its raised position, and as shown in FIG. The holding groove 22 is provided with a holding groove 22 in which the holding groove 14 is embedded and held.

Next, the linking mechanism 25 for linking the drive member 3 and the needle bar 12 will be explained. Reference numeral 26 denotes an elevating body mounted on the guide rod 2 so as to be movable up and down, and a connecting pin 27 fixed to the elevating body is connected to the crank rod 7. 28 is an engaging part formed at the lower part of the elevating body, and 29 is a pushing part formed at the upper part.
Reference numeral 0 denotes a driven body provided above the elevating body 26, which is mounted to the guide rod 2 via a bearing 31 so as to be able to move up and down. 32 is a connecting piece protruding from the driven body 30;
It is designed to fit into the fitting portion 15 of the link 14. Reference numeral 33 denotes a catch lever, whose intermediate portion is attached to the driven body 30 with a pin 34. 35 is an engaging claw;
It is configured to be able to engage and disengage from the engaging portion 28. 3
Reference numeral 6 denotes a receiving portion, which is formed into a slope as shown in the figure. 37
is a biasing spring, which is provided to bias the catch lever 33 in the direction in which the engagement claw 35 engages with the engagement portion 28.

Next, reference numeral 41 shown in FIG. 3 indicates a projecting portion provided on the elevating body 26, and reference numeral 42 indicates a projecting portion provided on the driven body 30. Reference numeral 43 denotes a rod-shaped guide body that extends over both overhanging portions, and as shown in FIG. Section 42
In addition, the rods 45 are fixed to the projecting portions 41, respectively. Reference numeral 46 denotes a compression spring interposed between the two projecting portions 41 and 42, which is fitted around the guide body 43 to prevent it from jumping out to the side.

Reference numeral 47 is a stopper fixed to the guide rod 2, which restricts the upward position of the driven body 30. The above spring 46
and S)-/Pa 47 is for holding the driven body 30 in the raised position when performing flying as will be described later.
As a means for this purpose, a protrusion 55 is provided on the catch lever 33 as shown in imaginary lines in FIGS. 5 and 6, and
The reciprocating piece 52 may be provided with a recess 56 that engages with the protrusion 55, and the engagement C2 between the two may hold the driven body 30 in the raised position.

Next, 50 is a locking mechanism attached to the machine frame 1, which in this example uses a rotary set of solenoids. Reference numeral 51 denotes its rotating shaft, to which a reciprocating piece 52 is attached.

In the above structure, when normal sewing is performed, the solenoid 50 is placed in a non-operating state as shown in FIG. In this state, when the upper shaft 4 rotates, the elevating body 26 moves up and down along the guide rod 2 via the crank mechanism 5. The downward movement of the elevating body 26 is transmitted to the driven body 30 via the catch lever 33, and the driven body 30 descends together with the elevating body 26 as shown in FIG. Further, the upward movement of the elevating body 26 is directly transmitted to the driven body 30.
moves upward together with the elevating body 26. Such a driven body 30
The vertical movement of the needle bar 1 in the operating position is performed via the connecting piece 32.
2 (as shown in FIG. 4, the connecting piece 14 attached to the needle bar is transmitted to the connecting piece 14 of the needle bar 12 located between the left and right holding frames 21 and 21), and the connecting piece The needle bar 12 moves up and down via the needle 14. As a result, as is well known, needle 1
3, sewing is performed on the cloth.

In the above case, the needle bar 12 can be switched as required using a well-known method. That is, in a state where the driven body 30 has moved to the raised position, the holding frame 10 is rotated via the driven part 11, and the needle bar 12, which is different from the above, is positioned at the above-mentioned operating position.

Next, when it is desired to carry out flying stitching while the elevating body 26 is moving up and down to perform normal sewing as described above, the following operation is performed. That is, when the driven member 30 rises as shown in FIG. 1 and the passive part 33a of the catch lever 33 faces the advancing/retracting piece 52 of the locking mechanism, the solenoid 50 is energized to operate as shown in FIG. The advancing/retracting piece 52 is advanced toward the driven part 33a, and the driven part 3
3a and maintain that state. Lever 33
By being pushed as described above, the engaging claw 35 is disengaged from the engaging portion 28 of the elevating body 26 as shown in the figure. When the elevating body 26 moves downward in this state, the driven body 30 is biased upward by the compression spring 46 for maintaining the raised position, so it is positioned at the raised position as shown in FIGS. 7 and 8. Only the elevating body 26 moves downward while maintaining this state. Therefore, even if the elevating body 26 repeatedly moves up and down, the states shown in FIGS. 6 and 7 are repeated, and the driven body 30 remains in the raised position.

Therefore, the needle bar 12 does not operate and sewing is not performed on the cloth.

When moving from normal sewing to jump stitching as described above, the time required for the retractable piece 52 to move from the retracted position shown in FIG. 5 to the advanced position shown in FIG. 6 is relatively short. If it is long, the elevating body 26 is rising (the driven body 30
When the moving member 52 has not yet reached the raised position, the advancing/retracting piece 52 starts to advance as described above, and when the driven body 30 reaches the ascending position due to the rise of the elevating body 26, the advancing/retracting member 52 as described above immediately moves. The passive portion 33a may be pushed.

Next, when returning to normal sewing from flying stitches, when the elevating body 26 is in the downward position as shown in FIG. Release the hold.

Then, as shown in FIG. 9, in the process of the lifting body 26 rising, the pushing part 29 pushes the receiving part 36, so it is pushed in the direction of the arrow against the biasing force of the catch lever 33 spring 37, and further When the elevating body 26 rises and comes into contact with the driven body 30, the engaging pawl 35 comes to face the engaging portion 28, so that the catch lever 3 is moved by the biasing force of the biasing spring 37.
3 moves in the opposite direction of arrow A, and the engaging pawl 35 engages with the engaging portion 28 as shown in FIG. Therefore, as described above, the elevating body 26 and the driven body 30 move up and down in unison, and normal sewing is performed.

When returning from jump stitching to normal sewing as described above, when the elevating body 26 moves from the state shown in FIG. 7 to the raised position shown in FIG. 6, the pushing motion of the catch lever 33 by the retractable piece 52 is released However, the engaging claw 35 of the catch lever 33 may be engaged with the engaging portion 28 of the elevating body 26 in the raised position.

(Effects of the Invention) As described above, in the present invention, when it is desired to perform normal sewing, the needle bar 12 is moved up and down via the linkage mechanism 25 by the operation of the drive member 3, and the needle 13 is used to perform normal sewing. Of course, if you want to sew a flying garment, you can cut off the interlock between the elevating body 26 and the driven body 30 in the interlocking mechanism 25 by activating the locking mechanism 50 in the interlocking mechanism 25. , the transmission of the operation from the drive member 3 to the needle bar 12 can be cut off, and the needle bar 12 can be brought into a non-operating state to achieve the purpose of threading.

Moreover, when changing from the above-mentioned continuous sewing state to the above-mentioned flying state, the interlocking movement between the elevating body 26 and the driven body 30 is interrupted by the following operation, namely: (a) the driven body 30 rises together with the elevating body 26,
(b) The catch lever 33 is actuated by the reciprocating piece 52 of the locking mechanism 50 to disengage the engaging claw 35 of the lever from the engaging portion 28 of the elevating body; (c) The catch lever 33 is actuated by the reciprocating piece 52. (d) After that, the driven body 30 is raised and the catch lever 3 is lowered so that only the elevating body 26 is lowered by itself.
3 is activated and then held in that state, which has the feature that the above-mentioned interlocking can be interrupted by maintaining that state after a simple movement.

This is useful because it solves the above-mentioned conventional problems, and even when the vertical movement of the elevating body 26 is performed at high speed, the above-mentioned interlocking movement can be reliably interrupted and jump stitching can be performed reliably. .

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a longitudinal sectional view of the head of the sewing machine, FIG. 2 is a partially cutaway front view of the head, FIG. 3 is a front view of the linking mechanism, and FIG. 4 is a sectional view taken along the line IV-rV, and FIG. 5 shows i! during normal sewing. ! ! FIG. 6 is a longitudinal sectional view showing the operating state of the linking mechanism; FIG. 6 is a longitudinal sectional view showing the state in which the reciprocating piece pushes the catch lever; FIG. 7 is a longitudinal sectional view showing the operating state of the linking mechanism during skip stitching; Fig. 8 is a front view of the linking mechanism in Fig. 7, Fig. 9 is a vertical sectional view showing the operating state when moving to normal sewing with jump stitching, Fig. 1
Figure 0 shows a conventional example. l... Machine frame, 3... Drive member, 12... Needle bar, 1
3... Needle, 25... Interlocking mechanism, 26... Lifting body,
30... Driven body, 33... Catch lever, 50...
...Lock mechanism. , one - Fig. 1 Fig. 2 Fig. 10

Claims (1)

[Claims] The machine frame is provided with a drive member for driving the needle bar, and the machine frame is provided with a needle bar having a sewing needle at its lower end that is movable up and down, and the drive member and the needle bar are In the sewing machine, the needle bar is moved up and down by the operation of the drive member, and the linkage mechanism is connected to the drive mechanism, and is connected to the drive mechanism so that the needle bar moves up and down to perform sewing with the needles. includes an elevating body provided with an engaging portion, a driven body provided on the upper side of the elevating body so as to be movable up and down and linked to the needle bar, and a locking mechanism provided with a reciprocating piece. The driven body has a catch lever provided at its lower part with an engaging pawl that engages with the engaging portion of the elevating body when the elevating body is close to the driven body. Along with pivoting,
The reciprocating piece in the locking mechanism is configured to operate the catch lever in a direction in which the engaging pawl is disengaged from the engaging portion when the driven body is raised, and to maintain the actuated state. A sewing machine characterized by: