JPS6243710B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a presser foot detachment device for a sewing machine.

Tokukai Sho with lockstitch mechanism and edge stitching mechanism
In the dual-purpose sewing machine of the type shown in No. 53-67551, when performing edge stitching, the presser foot of the lockstitch mechanism tends to get in the way of manipulating the fabric. This is the same even when the presser foot is raised, and it doesn't change much. Further, even if the presser foot is removed from the presser bar, the increase in space is small, and the operation of attaching and detaching the presser foot is relatively troublesome.

The presser foot becomes a hindrance to work not only when handling cloth in the above-mentioned dual-purpose sewing machine, but also when removing the throat plate of a normal sewing machine to inspect or remove the hook, or to replace the bobbin thread.

The object of the present invention is to provide a presser foot attachment/detachment device which allows sufficient space between the presser foot and the throat plate when the presser foot is removed from the presser bar, and which can be attached and detached with a single operation.

The following will be explained based on the drawings. In Fig. 1, 1 is the head of the sewing machine, and as is known, a presser bar 2 is biased in one direction and is equipped to be able to move up and down, and at its lower end there is a detachable device. A presser foot 3 is provided via A. 4 indicates the upper surface of the throat plate. The attachment/detachment device A is removably attached to the presser bar and has as its main part a connector for fixing the presser foot at its lower part.This will be explained in more detail with reference to FIGS. 2 and 3. A connecting tool 7, which fixes the presser foot 3 to the lower part with a screw 5, has a blind hole 8 on the upper side into which the small diameter part 21 at the lower end of the presser rod fits, and the upper part of the peripheral wall thereof expands upward. vertical grooves 9 are provided at appropriate intervals. This vertically divided groove 9 has the function of contracting the expanded portion, and also has the function of the pin 2 protruding from the small diameter portion.
2 are fitted and locked, thereby making it possible to stop the connection tool 7 from rotating and also to position it in the vertical direction. In order to attach the connecting device 7 to the presser bar 2, a seal 12 is slidably mounted on the connecting device. The expanded portion is compressed and contracted, and is held by the small diameter portion 21 at the lower end of the presser bar. In order to easily and reliably pull up the shell 12, there is a tapered cam groove 1 inclined in the axial direction on the circumferential surface of the connecting device.
3, an operating rod 15 is attached to the seal 12 in the radial direction, the tip of which protrudes inside the seal and is fitted and locked in the cam groove 13,
When the Ciel 12 is rotated by the operating rod 15,
The tip of the operating rod moves along the cam groove to raise the sheer. Here, cam groove 1
3, the tip of the operating rod is fitted and locked, but instead of the operating rod, a pin separately attached to the shell 12 may be fitted and locked.

In contrast to the device shown in FIGS. 2 and 3, in FIG. 4, a blind hole 31 is provided at the bottom of the presser bar, and the peripheral wall thereof is expanded downward, and several vertical grooves 33 are formed in this portion. Furthermore, there is a tapered cam groove 3 at the top.
5 is provided to fit and lock the tip of the stepped screw 37 screwed into the seal 36 which rotatably and slidably fits into the presser bar 2, while the connecting tool 38 has a shaft which fits into the blank hole. 39 is provided, and a pin 40 is provided on the shaft to fit and lock into the vertically divided groove 33. When the sheer 36 is rotated by the operating rod 37, the tip of the stepped screw is guided by the cam groove. As a result, the seal 36 descends and grips the shaft 39 of the connecting tool at the lower part of the presser rod.

In FIG. 5, the tip of the operating rod 41 is fitted into the cam groove 35 of the presser rod instead of the stepped screw.

In any of the above cases, the sheer is rotated and slid on the connecting device or presser rod under the lever action of the operating rod, but it is simply pushed up or down in the axial direction to move it. You can do it like this. In this case, since the seal only needs to be able to move in the axial direction, the seal, the connector, and the lower part of the presser bar can have any shape other than circular.
In addition, instead of forming a cam groove on the connecting device or presser rod, a pin may be provided protrudingly, and the pin may be fitted and locked into the cam groove formed on the seal, and the helical movement of the seal may be prevented. Instead of using a cam groove and a pin, this can also be done by providing a screw or a spiral or inclined step. Furthermore, instead of forming a blind hole, the connecting device or the presser rod itself may be constructed of a pipe. Furthermore, if the holding part of the upper part of the connecting device or the lower part of the presser bar has a shape that can be compressed and contracted by the forced movement of the seal,
As illustrated, it is not limited to expanding upwardly or downwardly, but may be formed with a protrusion such as a protrusion or a convex ridge over a part or the entire area.

As described above, in the present invention, the presser foot is provided in a connecting tool that is removably attached to the presser foot bar, so that when the connecting tool is removed from the presser foot bar, there is a gap between the presser foot and the throat plate, which makes it easier to handle cloth in a dual-purpose sewing machine. By removing the throat plate, a space is created that does not interfere with the work being done inside the bed, and the connection tool can be attached to and detached from the presser rod in one operation by simply moving the sheer up and down.

In addition, if the seal is configured to move in a spiral and is rotated by an operating rod protruding from the seal, the seal will move upward or downward due to the lever action, and the connection tool will move. Attaching to and detaching from the presser bar is performed easily and reliably.

[Brief explanation of the drawing]

Fig. 1 is a front view of the presser foot detachment device, Fig. 2 is an exploded perspective view of the device, Fig. 3 is a sectional view of the main part of the device, and Figs. 4 and 5 are sectional views of the main part of other embodiments. It is. 2... Presser bar, 3... Presser foot, 7... Connection tool,
8...Blind hole, 9...Vertical groove, 12...Siel, 13...Cam groove, 15...Operation rod, 22...
...Pin, 31...Blind hole, 33...Vertical groove,
35...Cam groove, 36...Siel, 37...Stepped screw, 38...Connecting tool, 40...Pin, 41...
...Operating lever.

Claims (1)

[Claims] 1. Connection tools 7, 3 for fixing the presser bar 2 and presser foot 3 together.
8, the other end is removably fitted inside and the shells 12, 36 are fitted on the outside, and the one end has vertical grooves 9, 33.
At the same time, the surface is sloped or swollen in part or over the entire area to prevent the sheer from moving in the axial direction under normal conditions, and the sheer is forcibly moved in the axial direction. A sewing machine presser foot attachment/detachment device that compresses one end and contracts to hold the other end. 2 Connecting tools 7, 3 that fasten presser bar 2 and presser foot 3
8, the other end is provided with a non-rotatable means and is removably fitted inside, and the operating members 15, 41 are protruded from the outside.
36 is fitted onto the outside so that the shell can move in a spiral manner, and vertically divided grooves 9, 33 are formed at one end, and the surface is partly or entirely covered so that the shell can move in a spiral manner. In order to prevent the sial from moving in the axial direction, the sial is tilted or bulged, and when the operating member is rotated, the sial moves in a spiral shape, and as it moves back and forth in the axial direction, the one end is compressed. A sewing machine presser foot release device that is adapted to contract and clasp the other end. 3. The presser foot attachment/detachment device for a sewing machine according to claim 2, wherein the non-rotatable means is a pin 22, 40 that projects from the other end and fits into a vertically divided groove. 4. The presser foot attachment/detachment device for a sewing machine according to claim 3, wherein vertical positioning is performed by engaging the pin with the end of the vertical groove. 5 A cam groove 13, 35 inclined in the axial direction is provided on one of the seal, the presser rod, or the connecting device so that the seal can move in a spiral, and a convex portion that fits into the cam groove is provided on the other. Claim 2
Presser foot attachment/detachment device for the sewing machine described in Section 1. 6. The presser foot attachment/detachment device for a sewing machine according to claim 5, wherein the convex portion is a tip of the operating member that protrudes into the seal. 7. The presser foot detachment device for a sewing machine according to claim 2, wherein the presser foot and the presser rod are screwed together so that the presser foot can move in a spiral manner. 8. The presser foot attachment/detachment of the sewing machine according to claim 2, wherein a spiral or inclined stepped portion is provided between the presser bar or the connecting device so that the presser foot can move in a spiral manner. Device.