JPS5846797Y2 - Sewing machine throat plate removal device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a needle plate removing device for a sewing machine.

In order to achieve beautiful straight stitches on a household zigzag sewing machine, it is desirable to replace the throat plate with one for straight stitches.To do this, push the throat plate up from below. Most of them have to be removed, but there are also known ones that can be pushed up in the same way by operating a simple lever mechanism.

However, with these conventional methods, it is necessary to operate the machine by inserting the hand inside the sewing machine bed, and the hands may get dirty with oil, so they are not always satisfactory in terms of ease of operation. It wasn't.

The present invention is aimed at solving these problems, and uses a drop feed control mechanism that releases the cloth feed operation by operating a lever, and is a technical means that adds a throat plate removal function to the mechanism. It has characteristics.

To explain the figure, an operating lever 1 is pivotally supported by a support shaft 2 at an appropriate position on the sewing machine frame, and one end is exposed to the outside through a slot Ha provided in the machine frame, and the other end is connected to one end of a link 3. The distal end of this connection side removably faces the curved portion 4a on the free end side of the leaf spring 4, one end of which is supported within the machine frame.

By engaging and disengaging this plate spring 4, the operating lever 1 is moved to the position A in the figure.
It can take three positions as shown in B and C, and the first
As shown in the figure, at position A, the link joint end is at the spring bending portion 4a.
The second
When set to position B as shown in the figure, the spring bent portion 4a is engaged with the spring free end side, that is, the bending of the leaf spring 4 causes a snap action at the spring bent portion 4a. With this action, the operating lever 1 can be held at two positions AB.

The operating lever 1 is configured to be able to further rotate from the B position to the C position shown in FIG. A spring 5 is stretched between the operating lever 1 and a slot 6 provided in the machine frame so that the operating lever returns to the B position when the operating hand is released.

The slot 6 guides the support end of the spring 5 on the machine frame side, and since the direction of the slot 6 is the same as the tensioning direction of the spring 5, the spring is 5 is not extended itself, and the operating lever 1 is only provided with a positioning effect from the leaf spring 4.

A plunger tab is connected to the other end of the stopper 3, and is slidably supported by the supporter 8 so that it can move forward within the supporter 8 in response to the displacement operation of the operating lever 1 from A to C position. There is.

The support end (not shown) of the supporter 8 extending in a direction substantially orthogonal to the plane of the figure is pivotably supported by the sewing machine frame so as to be able to swing up and down, and is always tilted downward to maintain engagement with the eccentric cam 10 by a spring 9. empowered.

The eccentric cam 10 is fixed to a rotating shaft 11 with a screw 12, and its rotation in synchronization with the movement of a hook (not shown) causes the supporter 8 to swing up and down.

Support shaft 1 located above the supporter 8 and supported by the machine frame at one end
The feed support arm 13 is vertically swingably supported by the feed support arm 13, and its tip faces the feed thrower 18a of the throat plate 18 to form a feed tooth 13a, and the lower branch portion 13b protruding from the lower part is connected to the supporter 8. Plunger 7 along one end face of
One hole 16 is formed facing the tip.

The hole 16 has a tapered portion 16 at the opening end facing the supporter 8.
The side of the plunger 7 facing the hole 16 has a stepped shape with a small diameter part 7a having a pointed end, and a stepped part from the small diameter part 7a to the large diameter part 7b. 7C
It is also tapered.

The feed support arm 13 is urged downward by a spring 15 stretched between its lower branch 13b and the machine frame, and when the operating lever 1 is in the A position as shown in FIG. When 7a is towed into the supporter 8,
Even if the supporter 8 moves up and down as the eccentric cam 10 rotates, the feed support arm 13 remains in the lowered position as shown, and the feed dog 13a remains below the throat plate 18.

When the operating lever 1 is in the B position as shown in FIG. 2, the plunger 7 moves forward and its small diameter portion 7a enters the hole 16, thereby linking the supporter 8 and the feed support arm 13. When the feed support arm 13 is moved up and down via the plunger as the eccentric cam 10 rotates, the feed tooth 13a protrudes and retracts from the upper surface of the throat plate 18 from the feed slot H8a of the throat plate 18.

The feed support arm 13 operates in such a vertical motion,
The structure is such that a feed mechanism (not shown) can provide the usual cloth feed movement by swinging the feed dog 13a in a direction perpendicular to the plane of the drawing.

The throat plate 18 is also locked in the opening of the sewing machine bed 17 in the usual manner by elastic locking pieces 19,20.

With the above configuration, the operation of the operation lever 1 is as follows.
In each state of the position and the B position, as described above, by engaging and disengaging the tip small diameter portion 7a of the plunger 7 to the feed support arm side (L16), a cloth feed rest state in which the feed dog 13a does not come out above the throat plate 18 is achieved. In other words, the surface state is selectively controlled by the operation lever 1, and the functions up to this point are similar to the conventional technology.

Therefore, when the operating lever 1 is rotated from the B position where the cloth is fed to the C position against the spring 5 as shown in FIG. enters and thereby lifts the feed support arm 13.

In this state, the feed dog 13a is not only exposed above the throat plate 18 from the feed slot 18a, but also the free end of the feed support arm 13 pushes up the throat plate 18 from below at this point, causing the needle The plate 18 is removed upwardly from the bed opening 18a by bending one or both of the locking pieces 19, 20.

That is, by turning the operating lever 1 from the B position to the C position, the feed support arm 13 is raised and the throat plate 18 can be lifted and removed. When the operating lever 1 is released, the spring 5 At the same time as it returns to the B position, the plunger also moves back to return the feed support arm 13 to the state shown in the second figure.

The device of the present invention, like the one on the diagonal, allows the throat plate to be easily removed without touching the throat plate or components inside the bed by simply rotating the operating lever that controls the operational state of cloth feeding to one side. I can do it.

Therefore, the operator does not get his hands dirty when replacing the throat plate, and the device of the present invention is practical because the operator can easily learn how to use it.

[Brief explanation of the drawing]

The figures are partially sectional front views of the same main parts from FIG. 1 to FIG. 3 showing an embodiment of the present invention, and each shows the operating state in the operating position. 1: Operation lever, 7: Plunger (7a: small diameter part, 7b
: Large diameter part, 7C: Taper), 10: Eccentric cam, 13:
Feed support arm (13a: feed dog), 16: hole, 18: throat plate.

Claims (1)

[Claims for Utility Model Registration] A plunger is provided in a path for transmitting the lifting motion from a rotating eccentric cam to a feed support arm having a feed dog at its tip in a fabric feed mechanism of a sewing machine that lifts and lowers a feed dog. In a cloth feed control device for a sewing machine that controls transmission of the lifting and lowering operation by engaging and disengaging from the feed support arm by advancing and retracting the plunger, the portion of the plunger that engages and disengages from the feed support arm is tapered at its stepped portion. The small diameter part of the stepped part engages and disengages with the hole on the feed support arm side to provide the engagement and disengagement control for the cloth feeding, and the large diameter part of the stepped part enters the hole to raise the feed support arm and push up the throat plate from below with its free end provided with the feed dog, and engages and disengages the operating lever for advancing and retracting the plunger. A needle plate removal device for a sewing machine, characterized in that the device is configured to be able to perform a rotation operation to one of two positions for control, and the large diameter portion of the plunger enters the hole by the rotation operation. .