JPH071112Y2 - Sewing machine needle lock device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a needle stopping device for a sewing machine that stops a needle at the lower end of a needle bar.

[Prior Art] Conventionally, a needle stopper device for a sewing machine has a hole formed along the central axis at the lower end of the needle bar, and a set screw orthogonal to this hole is screwed in from the side of the needle bar to make the base of the needle into the hole. After being inserted, it was screwed with the tip of the set screw.

[Problems to be Solved] In the conventional method, it is troublesome to turn the screw each time the needle is attached and detached, and it is difficult to see and the workability deteriorates because the needle is attached and detached at the lower end of the needle bar. There was a problem.

Further, since the lower end of the needle bar is a place where the needle tip of the sewing machine needle is exposed, it is dangerous to perform the attaching / detaching operation of the needle at the lower end of the needle bar, and there is a problem that the operator feels uneasy. [Means for Solving Problems] In the present invention, a taper portion that expands downward is provided on the outer circumference, and the slit member is brought into contact with and separated from the chuck member that has a slit formed in the vertical direction.
The chuck member is contracted by the pull-up spring via the rod member to the pull-up sleeve member by the pull-up spring to close the chuck member and chuck the needle. Further, the problem was solved by pushing down the rod member to pull down the chuck member and detaching it from the sleeve member so that the chuck member is opened and the needle is pulled out.

[Embodiment] The present invention will be described below based on an embodiment.

FIG. 1 is a sectional view of the present invention, in which 1 is a needle bar,
A cylindrical body extending in the up-down direction is provided with an inwardly projecting protrusion 1a in an intermediate portion thereof, and a holding body 2 having a locking portion 2a protruding inwardly is screwed into a lower end portion thereof. Three
Is a coil spring which is a first elastic body, and is loosely fitted in the upper hollow portion 1b of the needle bar 1, and the lower end thereof is engaged with the protruding portion 1a of the needle bar 1. 4 is a block member loosely fitted to the upper end of the needle bar,
The upper end portion projects from the upper end of the needle bar, the lower end portion engages with the upper end of the coil spring 3, and can move downward against the elastic force of the coil spring 3.

5 is a needle bar member, the block member is fixed to the upper end,
It is loosely fitted inside the needle bar 1 and extends vertically. 6 is
A chuck member having a taper portion 6a that expands downward on the outer periphery and a collar portion 6b on the lower end of the outer periphery and has a slit 6c in the vertical direction, and a needle hole having a certain depth from the lower surface of the collar portion. A portion 6d is provided, which is loosely fitted to the lower end of the needle bar so as to be vertically movable and screwed to the lower end of the bar member.

7 is a sleeve member, which is a taper portion of the chuck member 6.
The inner diameter of the chuck member 6 is tapered so that it fits into the 6a, and the inner diameter of the chuck member 6 is increased by contacting and separating from the taper portion 6a.
It is designed to shrink.

Reference numeral 8 denotes a coil spring which is a second elastic body, which is interposed between the sleeve member 7 and the protrusion 1a of the needle bar 1 and moves the sleeve member 7 downward to move the taper portion 6a of the chuck member 6 to the taper portion 6a. Checking member 6 by pressing and reducing the inner diameter of chuck member 6
It is arranged in the lower space 1c of the needle bar 1 so as to close the chuck part 6d.

Then, at all times, the elastic force of the coil spring 3 pushes the block member 4 upward, pulls the bar member 5 upward, and the collar portion 6b of the chuck member 6 is locked to the lower end of the holding body 2 and the coil spring 8 is held. The elastic force of the sleeve member 7
Is pressed against the taper portion 6a of the chuck member 6. Push the block member 4 downward against the elastic force of the coil spring 3,
When the rod member 5 is moved downward, the chuck member is pushed downward, and the elastic force of the coil spring 8 moves the sleeve member 7 downward so that the lower end of the sleeve member 7 is engaged with the locking portion 2a of the holding body 2. The chuck member is detached from the sleeve member 7 by abutting and further pushing down the rod member 5.

In order to attach the needle to the needle bar 1 with the needle fixing device of the sewing machine having the above-described configuration, the block member 4 is pressed downward against the elastic force of the coil spring 3, and the bar member 5 is moved downward to the first position. While moving from the position of the solid line in the figure to the position of the chain double-dashed line, the chuck part 6d of the chuck member 6 separates from the sleeve member 7 and opens as shown by the chain double-dashed line, and the needle tip is located at the base of the needle from below. Insert into the opening so that it contacts the bottom of 6d. When the downward pressing of the block member 4 is released,
The block member 4 returns from the two-dot chain line in FIG. 1 to the position indicated by the solid line, and the sleeve member 7 presses against the chuck member 6 to close the chuck portion 6d of the chuck member 6 and securely hold the needle on the chuck member 6. To do. To remove the needle, press the block member 4 downward to open the chuck portion 6d of the chuck member 6 and allow the needle to fall out.

[Other Embodiments] As another embodiment, the lower end of the coil spring 3 and the upper end of the coil spring 8 are provided in the middle portion of the needle bar 1 without providing the protrusion 1a projecting inwardly on the inner circumference of the middle portion of the needle bar 1. You can fix it around
Also, the same effect can be obtained by forming the coil spring 3 and the coil spring 8 into one long coil spring and fixing the middle part of the spring in the middle part of the needle bar 1 with a pin or a screw.

As the embodiment of the present invention, the one having the locking portion 2a protruding inward and the holding body 2 screwed to the lower end of the needle bar 1 is provided. You may make it form the locking part which protrudes toward one side.

[Advantages of the Invention] As described above, by pressing the block member 4 downward, the chuck portion 6d of the chuck member 6 is opened, and by releasing the downward pressing of the block member 4, the chuck portion 6d of the chuck member 6 is released. Needle bar 1 of the needle by closing 6d
Since it can be easily attached and detached to and from the needle bar 1 and the needle bar 1 is operated at the upper end portion, workability is improved and efficiency is improved.

Further, since the work is performed in a place away from the sewing machine needle, there is an effect that it is safe and does not give anxiety to the worker.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a needle stopper device of the present invention, in which 1 ... Needle bar 3,8 ... Coil spring 4 ... Block member 5 ... Bar member 6 ... Chuck member 7 ... Sleeve member

Claims (1)

[Scope of utility model registration request] 1. A needle bar (1) having an inwardly projecting locking part formed in a lower end of a vertically extending cylinder, and a lower end loosely fitted in an upper space of the needle bar to engage the lower end in an intermediate part of the needle bar. The stopped first elastic body 3 and the needle bar upper end are loosely fitted so that the upper end protrudes from the needle bar upper end and the lower end engages the upper end of the first elastic body and resists the first elastic body. Block member 4 that is movable downwards, a block member fixed to the upper end, and a bar member 5 that is loosely fitted in the needle bar and extends in the vertical direction, and a tapered portion that expands downward on the outer circumference and a lower end of the outer circumference. A chuck member 6 which forms a collar portion and is loosely fitted to the lower end portion of the needle bar so as to be vertically movable, and which has a groove vertically formed and fixed to the lower end portion of the bar member, and an inner peripheral portion which is fitted to a taper portion of the chuck member. To make the inner diameter of the chuck member larger and smaller by contacting and separating the taper part of the chuck member. , A sleeve member 7 that moves downward and the lower end is locked to the locking portion of the needle bar, and the upper end is locked in the middle portion of the needle bar and the lower end is engaged with the sleeve member, and the sleeve member is a chuck member. The second elastic body 8 is arranged in the lower empty portion of the needle bar so as to press the tapered portion of the needle member to reduce the inner diameter of the chuck member, and the block member is always moved upward by the elastic force of the first elastic member. By pushing up and pulling the bar member upward, the collar portion of the chuck member is locked to the lower end of the needle bar, and the sleeve member is pressed against the taper portion of the chuck member by the elastic force of the second elastic body to reduce the inner diameter of the chuck member. , When the block member is pushed downward against the elastic force of the first elastic body and the rod member is moved downward, the taper portion of the chuck member separates from the sleeve member to enlarge the inner diameter of the chuck member. What I did Sewing machine needle stop device characterized by