JPS60132587A - Needle rod change-over apparatus - 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 [Technical Field of the Invention] The present invention relates to a needle bar switching device for a sewing machine, and particularly to a left and right needle bar switching device for a twin-needle sewing machine.

[Prior art]

FIG. 1 shows an example of a two-needle corner stitch sewing machine. In this figure, parts related to the present invention are shown broken away. The sewing machine has a ped number of 10. Arm 12.
It consists of a top 14, and a flywheel 16 is provided on the right side of the top +4, and a flywheel 16 is provided on the left side of the top 14.
Two needles 18, 20 are provided towards the bed 10. The needles 18.20 are fixedly supported on needle bars 22.24, and the needle bars 22.24 are further supported on a needle bar support 26 so as to be movable up and down. A cam 28.30 is arranged above the needle bar 22.24, and the cam 28.30
Behind the 0, there is a link or lever 32. 34?
A set of needle bar switching solenoids is provided for each needle bar 22, 24 within the solenoid cover 66 through the needle bar 66. Needle bar 22.2
4 is carried out by switching the switch 38 and fully driving the needle bar switching solenoid in the solenoid cover '56.

Next, a conventional needle bar switching device will be explained based on FIGS. 2(A) to 2(C). In this figure, (B) is.

(A) It is a view seen from the entire right side, and (C) is the state during operation? FIG. These Figure 2 (A) or C)
In this case, the needle bars 50, 52 usually both perform vertical stroke movements simultaneously. A clutch device is installed inside the upper part of the needle bar 50.52, and the clutch device includes a pin 50A projecting from the tip of the needle bar 50.52.
, 52A are operated. The bottle 5
Cams 54+56 are arranged above 0A and 52A, respectively, and in normal operation, the tip portions 54A,
56A does not come into contact with the bins 50A and 52A.

The cams 511, 56 are pivotable about a common axis 58 and are each connected above with one of the links 60, 62. The other end of the link 60 is connected to a movable shaft of a solenoid 66 via a drive arm 64. The same applies to the link 62.

Next, the operation of the above conventional example will be explained. Now, of the needle bars 50 and 52 that move up and down at the same time, it is assumed that the needle bar 5O is stopped at the raised position. In this case, first switch (not shown)? Operate and apply Am to solenoid 66. As a result, the solenoid 66 operates, and the drive arm 64° link 6O changes from the state shown in Figure 2 (A) to the state shown in Figure 2 (C) V.
It will be in the state shown in C. This action causes the cam 54 to move toward the shaft 58.
The needle bar 50 rotates around the needle bar 50, and the tip end 54A stops on the movement trajectory of the needle bar 50.

Note that one or more operations are performed when the needle bar 50 is lowered to the lower position.

Next, when the needle bar 50 rises in the above-described state, the bottle 50A comes into contact with and is pressed against the tip 54A of the cam 54, and the clutch device in the needle bar 50 operates. Therefore, the operation of the needle bar 50 is stopped, and the needle bar 5O is stopped at the raised position.

Next, in order to cancel the stopped state, when the power to the solenoid 66 is cut off, the state shown in FIGS.
The clutch device inside is released. With this, the needle bar 50
will start moving up and down.

The same applies to the needle bar 52. Therefore, cams 5A, 5
6, the two needle bars 50.degree. 52 can be stopped alternately or moved up and down at the same time.

However, the conventional needle bar switching device described above not only requires a cam and a solenoid for each needle bar, but also requires adjustment of the engagement position between the pin and the cam tip, a drive arm,
The present invention has been made in consideration of the need to adjust the position of the link and the movement due to positional deviation of the cam, etc., and can simplify such adjustment and reduce movement and defects. The purpose of this device is to provide a needle bar switching device t k 1M that is simple and easy to perform (I'), and the biasing means of a clutch device built in the needle bar is driven by the rotation of a cam means. All of the above objectives are achieved by a needle bar switching device in which the operation of this cam means is performed by one actuator.

[Embodiments of the invention]

Hereinafter, the needle bar switching device according to the present invention will be explained in detail with reference to the embodiment vc shown in FIG.

FIG. 6(A) shows an embodiment of the copper rod switching device according to the present invention, partially cut away. The view seen from arrow I in this figure is shown as FIG. 6(B).

In addition, views of the main parts viewed from the arrow ■ in Figure (A) are shown as Figures (C), (D), and (E), respectively.

In these figures, a needle bar 100° 102 is fitted and supported by a needle bar support 104 so as to be movable up and down, and this needle bar support 104 is supported in a pendulum shape on a stepped shaft 106 at the top of the figure. It is being This stepped shaft 106 is supported on a sewing machine main body (not shown).

A camshaft 108 is rotatably supported at the center of the stepped shaft 106, and the thrust is fixed by a collar 110 at the top. Further, above the stepped shaft 106, a mounting plate 112 is provided for the water passage 112A'.

An actuator 114 that serves as a drive source for the camshaft 108 is arranged. Drive shaft 114A of this actuator 114
A groove 114B is provided at the tip of the drive shaft 114A, and the drive shaft 114A is led out in the direction of the needle bars 100 and 102 via a water passage 112A of the mounting plate 112. Drive shaft 1
The groove 114B of 14A fits into the camshaft 108.

The tip 108A6-1 of this camshaft 108:, Fig. 3 (
As shown in CJ, (D), and (E), it has a substantially fan-like shape when viewed from the direction of arrow 1■.

On the other hand, the needle bars 100 and 102 have the tenth needle bar holder 116.
and the second needle bar holder 118 are fitted, respectively. !
1. The needle bar 116 has a needle m1oo.

Balls 12o are provided at two predetermined locations of 102.

It has a known clutch mechanism with 122 protruding effects.

The needle bar 116 is connected to a crank rod 124 by a predetermined pin means, and the crank rod 124 is further connected to a crank 128 by a crank pin 126. The crank 128 is connected to the left end in FIG. 1 of an upper shaft 130 that is connected to the flywheel 16 shown in FIG. In other words, the rotational movement of the upper shaft 130 is
The crank 128 and the crank rod 124 convert the movement into a reciprocating movement in the vertical direction in the figure, and the needle bars 100 and 102 are configured to move up and down through the entire needle bar head 116.

Note that a clutch device is built in each of the needle bars 10'0.102, and the clutch devices operate when the bottles 100A and 102A arranged at the top tips of the needle bars 100 and 102 are pressed. It has become.

Next, the overall operation of the above embodiment will be explained. First, when moving needle bars 100 and 102' up and down at the same time,
The tip 108A of the camshaft 108 is in the state shown in FIG. 3(C), and neither the bins 100A nor 102A are in contact with the tip 108A.

In this case, since the clutch devices in the needle bars 100 and 102 do not operate, the driving force generated by the rotation of the upper shaft 160 is transferred to the crank 128. Crankbin 126. Needle bar 10 via crank rod 124 and needle bar head 116
0.102, and the needle bars 100 and 102 simultaneously reciprocate up and down.

Next, when stopping the needle bar 100, the actuator 114 is driven and the camshaft 108 is rotated to stop the needle bar 108A.
is the movement locus range of the bin 100A. This situation is shown in FIG. 6(D). Note that the above operations are performed in any state where the needle bar 100 is in the lower position. Next, when the needle-bar 100 rises and reaches the highest position, the bottle 100A is moved to the tip 108A of the camshaft 108.
It comes into contact with and is pressed. With this, needle bar 1
The clutch device in 00 operates, and the needle bar 100 stops at the raised position.

Next, when the stopped needle bar ioo'fr is to move again, the camshaft 108 is reversed by the actuator 114, and the tip end 108A' of the camshaft 108 is brought into the state shown in FIG. 3(C). The clutch device in the needle bar 100 is released, and the needle bar 1oo performs the vertical movement 1 again.

The same applies to the case where the vertical movement of the needle bar 102 is stopped, and the tip 1 of the camshaft 108 is
At 08A', the state shown in FIG. 6(E) is established. Resuming exercise is also similar to the case described above.

〔Effect of the invention〕

As explained above, according to the needle bar switching device according to the present invention, the biasing means of the clutch device in the needle bar is driven by the rotation of the cam means which is rotationally controlled by the drive means such as an actuator. Therefore, the operating condition is good.
This simplifies the adjustment for the adjustment, simplifies the configuration, and reduces the occurrence of malfunctions.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing an example of a two-needle corner stitch sewing machine, Fig. 2 (A) or C) is a view showing an example of a conventional needle bar switching device, and Fig. 3 (A). and (B) is a diagram showing an embodiment of the needle bar switching device according to the present invention, and FIG. 3 (C)
or E) is an explanatory diagram showing the operating state. In the figure, 100.102 is a needle bar, 100A. 102A is the bottle, ios is the camshaft, 108A is the tip, 1
14 is an actuator. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Patent Attorney Kimura Mitsuru Ryocho Continued hli +I: ili: (Voluntary) 1986
Il'3 J11211 Patent 1, 1 Director-General 1, Table of Matter f'l, J< Patent Application No. 58-241041 2, Name of the invention Needle bar switching device 3, Representative name for hli stop 1' , Yuni 8 parts 4, agent 5 voices, amendment 1, "Detailed description of the invention" column of the application and specification, and G,
Contents of amendment η ligana 1 in the “Title of invention” column of Q fit
- Amend "Shinopoi Kukirikae Souji" to "Harihou Kirikae Souji" as per the attached document δ. . -(2) 1゛toj1jl in the second line of the second page of the specification is 1
1. Correct it as "Global cover 14". (3) "Top 14" in the fourth line of page 2 of the specification is corrected to "top cover 14." (4) "Separate frame 116" on page 7, line 12 of the specification is corrected to "1-side bar 116". (5) Figure 3 (A) of the drawings shall be corrected as per the attached correction direction. that's all

Claims (1)

[Scope of Claims] In a needle bar switching device for switching the movement of at least two needle bars, each of which includes a clutch means therein, and which are each disposed at an angle of 16 degrees such that the biasing means of the clutch means can be operated from the outside. . The needle bar switching device includes a cam means that rotates to drive one of the biasing means, and a drive means that rotates the cam means in both forward and reverse directions. .