JPH088777Y2 - Sewing machine presser foot discriminator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a presser foot discriminating device for a sewing machine.

(Prior Art) Conventionally, a device has been proposed in which the shape of the presser foot is discriminated by a detection device composed of a magnet arranged in the needle plate by selecting the presser foot suitable for the stitching type, that is, the normal stitch or the embroidery stitch. 54-163142).

(Problems to be solved by the invention) In the present invention, the needle type is identified and distinguished by the magnet device provided on the lower surface of the needle plate according to the size of the presser foot or the position of the needle plate grounding portion in the prior art. This solves the problem that the narrow space under the plate becomes more complicated and it is difficult to provide a sufficient device.

(Means for Solving the Problem) The present invention is suitable for a desired sewing type by individually changing the presser bar attachment position heights of a plurality of pressers suitable for the sewing type in order to determine the presser foot of the sewing machine. By attaching the presser foot to the presser bar, the presser bar height with respect to the needle plate surface is displaced, and the sewing type detection unit that interlocks with the displacement of the presser bar height is provided in the arm machine frame, and the sewing type The arm is a space-saving arm with a sewing type detection unit for distinguishing the presser foot, which is configured to send a control signal according to the presser bar height to the display unit provided on the surface of the arm machine frame that is easily visible to the operator from the detection unit. By arranging it in the machine frame, it is possible to dispose various devices that have not been considered in the past.

(Operation) According to the present invention, by changing the height of the presser bar mounting portion of a plurality of pressers according to the sewing type, the presser bar is attached to the presser bar to displace the presser bar in the vertical direction. The sewing type detecting section is operated by the operation plate via a link pivotally attached to the presser bar attached to the presser bar, and a signal is output from the sewing type detecting section and information on the sewing type is displayed on the display section provided on the arm machine frame. Since the arrangement position of the sewing type detecting section can be set in the arm machine frame with a lot of space in the peripheral portion supporting the presser bar, there are many sewing type detecting sections depending on the sewing machine grade. It is characterized in that it is possible to make a large-scale presser foot that can be discriminated.

(Embodiment) An embodiment of the present invention will be described with reference to the drawings. A sewing machine 1 includes an arm frame 2 and a bed frame 3. Arm machine frame 2
On the front wall of the, a pattern selection section 4 comprising a plurality of selection keys, a display section 5 for displaying an instruction or a message relating to the selected pattern or a selected mode (for example, ordinary sewing or embroidery sewing), the selected pattern A control operation unit 6 having an operation unit for manually controlling the widths and feed pitches of the same and the like is provided.

An upper shaft 8 rotated by a drive motor (not shown) via a belt 7 is horizontally indicated in the arm machine frame 2, and a balance crank 9 is fixed to an end portion of the upper shaft. Then, the needle bar 10 is moved up and down by the rotation of the balance crank.

Reference numeral 11 denotes a needle bar support, which is swingably instructed by the arm machine frame 2 and supports the needle bar 10 at one end thereof so as to be vertically movable, and is connected to an amplitude rod at the other end.

The amplitude rod is connected to a rotating arm 14 of an amplitude stepping motor 13 mounted on the arm machine frame 2.

The bed machine frame 3 is equipped with a thread catcher 15, which is rotated in synchronism with the vertical movement of the needle bar 10 so that the needle 16 mounted at the lower end of the needle bar is The loop of the upper thread to be carried is captured, and the upper thread and the lower thread held in the thread capturing section 15 are entangled to form a stitch.

Reference numeral 17 is a presser bar, which is supported in the arm machine frame 2 so as to be movable in the vertical direction.
A presser foot adjustment spring 19 is attached to the upper part of the presser bar so that the spring pressure can be adjusted by operating the adjustment dial 20, and a presser foot 21 is replaceably attached to the lower end.

Reference numeral 22 denotes a presser actuating body, one end of which has a follower arm 23 and the other end of which has a connecting arm 24. The actuating shaft 25 is parallel to the upper shaft 8.
It is rotatably supported by.

A pressing operation cam 26 is fixed to the upper shaft 8, and a driven arm 23 of the pressing operation body 22 is brought into contact with the outer periphery of the pressing operation cam.

In addition, a link is formed at the end of the connecting arm 24 at the other end of the presser working body 22.
The presser bar duck 18 is connected via 27, 28 is a sewing type detecting portion fixed to the arm machine frame 2, and an operating plate 29 formed on the presser operating body 22 is an operating piece 29 of the sewing type detecting portion. 30 is provided so as to be abuttable.

The basic height H _{1 of the} presser foot 21 is large. When the basic presser foot 31 is attached to the presser bar 17, the connecting arm 24 can be rotated upward around the operating shaft 25, so that the connecting arm 23 integrated with the connecting arm is rotated upward, and the presser operating cam 26 is rotated. It is separated from the outer circumference (Fig. 4-a).

Further, when the embroidery presser foot 32 having a small basic height H _{2 of the} presser foot 21 is attached to the presser bar 17, the connecting arm 24 is rotated downward about the actuating shaft 25 to form a connecting arm. The driven arm 23, which is integrated, rotates downward and is brought into contact with the outer periphery of the presser working cam 26.

Therefore, when the embroidery presser foot 32 is attached, the presser bar 17 moves up and down and the lower surface of the presser foot is separated from the needle plate surface (Fig. 4-b).

The sewing type detecting portion 28 is set so that the operating piece 29 is further pushed by the operation plate 30 when the basic presser foot 31 is attached and the presser bar 17 is at the lowest point state, and is turned on below. Also, the embroidery presser foot 32 is attached, and the presser bar 17 is moved up and down by the presser operating cam 26 so that it is turned off above the uppermost point.

The range of switching is limited by the height of H shown in FIGS. 4 + a and 4-b.

FIG. 5 shows another embodiment of the present invention, in which 33 is a transducer for detecting the height of the presser bar in an analog manner and is attached to the arm frame 2. Transducer
The tip of the movable rod 34 of 33 is fixed to the presser bar stick 18 and is in contact with the end surface of the sensor arm 35.

Since the present invention is constructed as described above, if the basic presser foot is attached and the presser foot is lowered onto the needle plate surface on the bed machine frame, the cloth is always pressed during sewing machine operation, and the embroidery presser foot is attached. If the needle is pierced through the cloth during operation of the sewing machine, the presser foot holds the cloth when the sewing machine is operating, and the presser foot rises and is separated from the cloth when moving the cloth.

Then, either normal sewing or embroidery sewing is selected, for example, in the normal sewing mode, if the user mistakenly attaches the presser foot and attaches the embroidery presser foot 32, the operation plate 30 is lowered via the presser bar 17. Then, since the switch of the sewing type detecting section 28 is turned on, an instruction is issued from the built-in arithmetic circuit (not shown) and the message "Please change the presser foot to the basic presser foot" is displayed on the display section 5. In addition, in the embroidery mode, the user makes a mistake in attaching the presser foot
When 31 is attached, the operation plate 30 rises via the presser bar 17 and turns off the sewing type detection unit 28, so a signal is issued and a message “Please replace the presser foot with the embroidery presser foot” is displayed on the display section 5. Is displayed.

(Effect) The present invention has the above-described configuration and operation,
By providing a sewing type detection unit in the arm machine frame, when a presser foot inappropriate for the selected sewing mode is attached, a message for instructing the user to replace the presser foot is displayed on the display unit. This is a practical effect that is indispensable in a sewing machine having multiple functions and becoming more and more complicated.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is an external perspective view of a sewing machine equipped with the present invention, FIG. 2 is an exploded perspective view showing an essential part of the present invention, and FIG. A front view showing a state in which the basic presser foot is attached, FIGS. 4-a and 4-b are drawings comparing the attached state of the basic presser foot of the present invention and the attached state of the embroidery presser foot, and FIG. 5 is a book. FIG. 2 is a front view of another embodiment of the invention, in which 2 is an arm frame, 3 is a bed frame, 5 is a display part, 8 is an upper shaft, 17 is a presser bar, 18 is a presser bar, and 21 is a presser bar. Gold, 24 is a connecting arm, 28 is a sewing type detection unit, 30
Is an operation plate, 31 is a basic presser foot, and 32 is an embroidery presser foot.

Claims (1)

[Scope of utility model registration request] 1. A sewing machine frame is composed of an arm frame and a bed frame, and the arm frame supports a needle bar that can be moved up and down by rotation of an upper shaft, and the bed frame has a needle of the needle bar. A presser foot that supports a thread catching portion that forms a seam in cooperation with the arm machine frame, supports a presser bar on the arm machine frame, and constantly presses a presser foot attached to the lower end of the presser bar against the upper surface of the bed machine frame. In a sewing machine provided with an adjusting spring, a plurality of presser feet having different basic heights are provided, and a sewing type detecting section for detecting that a presser foot having a different basic height is attached to a lower end of the presser bar is provided on the arm machine. An operating plate is provided at the engaging position of the sewing type detecting section integrally with a connecting arm that is provided on the frame and is connected to the presser bar duck fixed to the presser bar, and a display indicating the presser foot determination is provided on the arm machine frame. A presser foot discriminating device for a sewing machine, which is provided with a section.