JPH0530704Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a looper adjustment mechanism for a sewing machine that is provided with an eccentric pin that facilitates changing the trajectory of the upper looper.

[Prior Art] As shown in FIG. 4, a conventional upper looper mechanism has one end of a swinging arm 2 fixed to an upper looper shaft 1 rotatably supported on a sewing machine frame, and a driving shaft (not shown). ) The other end of the swinging arm 2, which swings in conjunction with the movement of the swing arm 2, is connected to one end of the upper looper holder 4 by a straight pin 5. Further, the middle of the upper looper holder 4 is slidably supported within the upper looper guide 6, and furthermore, the upper looper 7 is disposed at the other end of the upper looper holder 4.
is fixed. In addition, 3 is fixed to the frame via the elongated hole 3b with a plurality of screws 3a, and the fourth
It is a support that can be moved and locked from left to right in the figure, and an upper looper guide 6 is provided at the end thereof to be rotatable within the support 3 in a direction perpendicular to the upper looper holder 4, and the upper looper guide 6 An upper looper holder 4 is slidably provided in a hole-shaped looper guide 6a opened in a direction perpendicular to the upper looper guide 6a.

In the upper looper mechanism configured in this way, the swinging of the swinging arm 2 is transferred from the swinging arm 2 to the upper looper guide 6.
It is transmitted via a straight pin 5 to the upper looper holder 4 which slides inside. Therefore, in this upper looper mechanism, in order to change the trajectory of the upper looper 7, swing arms 2a and 2b with different arm lengths are prepared as shown in FIG. This was done by replacing either one of 2b.

[Problems to be Solved by the Invention] Therefore, in this conventional upper looper mechanism, in order to replace the swinging arm 2a and 2b with one of the swinging arms 2a and 2b having a different arm length, the swinging arm 2 and the straight pin 5 must be replaced. It is necessary to remove the upper looper holder 4, change the position of the end of the upper looper holder 4, and mount the swinging arm 2a or 2b and the straight pin 5, which is a very troublesome work. Further, a fuel supply pin is provided on the frame opposite to the position of the straight pin 5, but since the lengths of the swinging arms 2a and 2b are different, the fuel supply pin is provided at a position corresponding to the length of one of the swinging arms 2a. However, when the other swing arm 2b is used, oil cannot be supplied, so there is a problem in that the position of the oil supply pin must also be changed.

This invention uses an eccentric pin in the connecting part between the swing arm and the upper looper holder, so that the length of the arm can be changed simply by making the eccentric pin rotatable and lockable. The object is to provide a looper adjustment mechanism.

[Means for Solving the Problems] In order to achieve the above object, the present invention connects one end of the swinging arm to an upper looper shaft that is linked to the rotation of the driving shaft and rotatably supported by the frame. , in a looper adjustment mechanism of a sewing machine, the other end of which is connected to one end of the upper looper holder, and the upper looper is fixed to the other end of the upper looper holder, the mechanism is provided at the other end of the swinging arm and at one end of the upper looper holder. An eccentric pin is rotatably mounted in the hole.

[Function] According to the present invention, by rotating and locking the eccentric pin, when the eccentric position of the eccentric pin is at the tip, one end of the upper looper holder is moved from the center of the eccentric pin to the tip of the swing arm. When the eccentric position of the eccentric pin is rotated toward the upper looper shaft and locked, one end of the upper looper retains the eccentric pin. is moved from the center to the upper looper axis side, and the swing arm is in the same state as if it were shortened, so it is the same as when swing arms of two lengths are used without replacing the swing arm. become. Furthermore, since the position of the eccentric pin does not change, there is no need to change the position of the oil supply pin.

[Embodiment] Referring to FIG. 1, in the looper adjustment mechanism according to one embodiment of the present invention, the other end 8a of the swinging arm 8 is configured with two prongs, and the one end 9a of the upper looper holder 9 is configured with two prongs. A large-diameter insertion hole 8b configured to be held between the ends 8a and into which the large-diameter end 10a of the eccentric pin 10 shown in FIG. 2 is inserted into the other end 8a of the swinging arm 8.
and a small-diameter insertion hole 8c into which the small-diameter end portion 10b is inserted, and an upper looper holder 9.
An insertion hole 9b having an intermediate diameter is provided at one end 9a of the eccentric pin 10, into which the central portion 10c of the eccentric pin 10 is inserted.
Note that although the central axes A of the end portions 10a and 10b of the eccentric pin 10 are the same, the central axis B of the central portion 10c is
is offset from the central axis A. Therefore, the other thin end 10b of the eccentric pin 10 is inserted into the insertion hole 8b of the swing arm 8, and then inserted into the insertion hole 9 of the upper looper holder 9.
b, and then into the insertion hole 8c of the swinging arm 8, each part 10a, 10b, 10 of the eccentric pin 10
c are inserted into the respective insertion holes 8b, 8c, and 9b in close contact with each other. Therefore, the eccentric pin 10 is rotated to a desired position and locked from at least one end surface of the two prongs of the other end 8a of the swing arm 8 with the screw 8d.

In the looper adjustment mechanism of this embodiment, since the central axis of the central portion 10c of the eccentric pin 10 is eccentric in this way, the central axes A and B of the eccentric pin 10 are
When in the position shown in , one end 9 of the upper looper holder 9
a is the insertion hole 8b, 8 of the other end 8a of the two prongs of the swinging arm 8;
The swing arm 8 is moved further toward the tip than the position c, and the swing arm 8 becomes longer. Also, eccentric pin 1
When the center axes A and B of 0 are at the positions shown in FIG. The length of the swing arm 8 can be changed by simply rotating and locking the eccentric pin 10. .

It is preferable that both ends 10a and 10b of the eccentric pin 10 be formed in a tapered shape so that the end 10b is thinner, and that the center part 10c is formed so as to have the same diameter as a whole. In FIG. 1, the end 8a of the swinging arm 8 is bifurcated to hold the end 9a of the upper looper holder 9, but the end 9a of the upper looper holder 9 may also be bifurcated. good.

In the looper adjustment mechanism of this embodiment, the length of the swinging arm 8 is simply adjusted by rotationally locking the eccentric pin 10 at the same position. The position of the oil supply pin 12 provided opposite to the oil supply pin 10 does not need to be changed even if the eccentric pin 10 is rotated. In addition, lubricating oil filler port 1
Reference numeral 2a is provided on the upper side surface of the oil supply pin 12, which is provided at a substantially right angle to the frame 11, so as to receive the lubricating oil scattered within the frame of the sewing machine, and an injection hole 12b is provided at the center of the oil supply pin 12. Further, a fuel supply port 12c is provided on the end surface of the fuel supply pin 12 so as to face the eccentric pin 10.

[Effects of the invention] Since the present invention is configured as described above,
Since the pin that connects the swinging arm and the upper looper holder is an eccentric pin, by rotating and locking this eccentric pin, it is possible to change the length of the swinging arm. There is no need to change the position of the pins, so there is an advantage that workability is improved and efficiency is increased.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a part of a looper adjustment mechanism according to an embodiment of the present invention, FIG. 2 is a plan view of an eccentric pin, and FIG. 3 is a configuration diagram of a looper adjustment mechanism according to an embodiment of the present invention. FIG. 4 is a configuration diagram of a conventional looper adjustment mechanism, and FIG. 5 is a configuration diagram of a swing arm of the conventional looper adjustment mechanism. 8... Swinging arm, 8a... Other end of the two prongs, 8b, 8
c...Insertion hole, 9...Upper looper holder, 9a...One end, 9b...Insertion hole, 10...Eccentric pin, 10a
...One end, 10b...The other end, 10c
……Center.

Claims (1)

[Scope of utility model registration request] One end of the swinging arm is connected to an upper looper shaft which is rotatably supported by the frame in conjunction with the rotation of the driving shaft, the other end is connected to one end of the upper looper retainer, and the other end of the upper looper retainer is connected to the upper looper shaft. A looper adjustment mechanism for a sewing machine having a fixed upper looper, characterized in that an eccentric pin is rotatably mounted in a hole provided at the other end of the swinging arm and at one end of the upper looper holder. .