JPS6026146Y2 - Embroidery frame movement position detection device - Google Patents

Description

[Detailed explanation of the idea] This idea is based on the embroidery frame that holds the cloth stretched over it.

In an embroidery machine that moves in the Y direction to form stitches and embroidery stitches while changing its position relative to a fixed needle drop point, the embroidery frame moves until both ends of the embroidery frame in the X and Y directions approach the needle drop point. The present invention relates to a moving position detecting device for an embroidery frame that detects the position of the embroidery frame, and particularly, it is an object of the present invention to enable the position to be easily and always reliably detected regardless of the size of the embroidery frame or the mounting position of the embroidery frame.

An embodiment of this invention will be explained with reference to the drawings.

1 is a base with a horizontal top surface 1a; 2 is a sewing machine placed on the base 1 so that the bed surface 2a is flush with the top surface 1a of the base 1; 3 is the main shaft of the sewing machine 2 (not shown) A drive motor (DC servo motor) is connected to the main shaft and can be stopped, and 4 is a needle that moves up and down in conjunction with the main shaft.

On one side of the sewing machine bed 2a, reference numerals 5 and 6 denote a pair of elongated holes formed vertically and vertically through the base top surface 1a along the direction (Y direction) intersecting the axial direction (X direction) of the main shaft, and the bed. On the other side of 2a, 7 and 8 are the upper surface 1 along the X direction.
A pair of elongated holes are formed to penetrate above and below a.

Reference numeral 9 denotes a support frame that is long in the Y direction and is placed on the base top surface la so that the space in the middle corresponds to the sewing part of the sewing machine 2 (the needle drop point of the needle 4). A frame portion 9A on one side that intersects and a frame portion 9 on one side that intersects in the longitudinal direction of the elongated hole 7.
Each frame portion 9A has a slot (not shown) that opens downward on the bottom surface of each frame portion B.

It is formed along the longitudinal direction of 9B.

On the inside of the base 1 is the face of Jitsugyo No. 57-64599 (Jitko Sho 59).
-32636) The connecting means described in the specification and drawings are arranged in association with the frame portions 9A and 9B of the support frame 9, respectively.

Regarding the connecting means corresponding to one frame portion 9A, 10 is a support shaft supported along the elongated hole 5 and facing downward, and 11 is a stepping motor (11) loosely fitted to the support shaft 10.
(not shown) is a driven body that can reciprocate in the axial direction.

Reference numeral 12 denotes a support body bent in a substantially oval shape and arranged along the axial direction of the support shaft 10, and the lower protruding portion 12a is fixed to the upper end of the driven body 11, and the upper protruding portion 12b is slid in the elongated hole 5 in the longitudinal direction. It movably penetrates and protrudes above the base upper surface 1a.

Reference numeral 13 denotes a holder which is held parallel to the upper surface 1a of the base and fixed to the upper protrusion 12 of the support 12, and which is fitted into a slot in the frame part 9A of the support frame 9. Four rotating bodies 14, each having two outer circumferential surfaces protruding from both sides so as to engage with each other, are supported rotatably about a vertical axis.

A protrusion 15 is formed to protrude from one side of the holder 13 facing upwardly of the elongated hole 6 parallel to the elongated hole 5. The protrusion 15 is formed to protrude from one side of the holding body 13, and the lower end surface of the protrusion 15 has a substantially hammered shape, and the space in the middle is magnetically attached to the elongated hole 6. Opposed magnet 16
to be fixed.

Two parallel support shafts 17.18 are fixed along the longitudinal direction of the elongated hole 6 and opposite to each other below the elongated hole 6, and a pair of movable bodies 19. 20 is loosely fitted and supported, and a magnetic sensing body 21.22 such as a Hall element that can be fitted into the space of the magnet 16 is fixedly arranged on the upper end surface of the exchange movable body 19.20, facing the elongated hole 6. Knobs 23 and 24 are loosely fitted into the elongated hole 6 and protruded upward from the elongated hole 6 so that they can be gripped by an operator and moved in the longitudinal direction of the elongated hole 6.

Note that when the knob 23 engages with the outer end surface of the frame portion 9A, the sensing body 21 faces the space of the magnet 16, and when the knob 24 engages with the inner end surface of the frame portion 9A, the sensing body 22 faces the magnet 1.
It is set so as to face the space part 6.

Reference numeral 25 denotes an embroidery frame detachably supported on the support frame 9, and is held in tension by an outer annular piece and an inner annular piece, as is well known from Japanese Utility Model Application Publication No. 55-58692.

Although not shown, in this sewing machine, only the stepping motor is driven and stopped while the drive motor 3 is in a stopped state in connection with the operation of the operation switch, and the support frame 9 is moved in forward and reverse directions with respect to the X direction and in the Y direction. It has a function to move and stop separately in forward and reverse directions.

In addition, as described above, although not shown in the drawings, a similar connecting means is arranged corresponding to the frame portion 9B.

That is, a holder fixed to a support protruding from the elongated hole 7 is fitted into a slot in the frame portion 9B, a magnet fixed to the holder is placed opposite the elongated hole 8, and a pair of magnets are placed along the longitudinal direction of the elongated hole 8. Magnetic sensing bodies, such as Hall elements, fixed separately to a pair of movable bodies which are supported loosely with the frame 9B sandwiched between the support shafts are arranged so as to be able to face the spaces between the magnets. It protrudes above the elongated hole 8 so that it can be moved.

Although not shown, in the control circuit of this sewing machine, there are detection bodies (21, 22...) in the X and Y directions during sewing.
When a detection signal is generated from (i.e., the embroidery frame 2
5), the sewing machine is set to stop automatically.

This invention has the above structure, and its operation will be explained next.

The moving bodies 19 and 20 are moved to both longitudinal ends of the elongated holes 6 and 8, and the embroidery frame 25 is supported on the support frame 9.

The support frame 9 is moved so that the needle 4 is positioned approximately at the center of the embroidery frame 25, and then the operating means is operated to drive the stepping motor in one direction. is moved in the forward Y direction until the needle drop point of the needle 4 approaches the edge of the reverse Y direction of the embroidery frame 25, and then stopped, and the knob 24 on the inside of the support frame 9 is engaged with the inside end surface of the frame portion 9A. then move in the reverse Y direction (Figure 3).

At this time, the sensing body 22 of the moving body 20 faces the space of the magnet 16 and generates a sensing signal.

Operate the operating means to drive the stepping motor in the opposite direction. Move the waist support frame 9 in the reverse Y direction until the needle drop point of the needle 4 approaches the edge of the embroidery frame 25 in the positive Y direction, and then stop. 9
The outer knob 23 is moved in the positive Y direction so as to engage with the outer end surface of the frame portion 9A (FIG. 4).

At this time, the sensing body 21 of the moving body 19 faces the space of the magnet 16 and generates a sensing signal.

Next, the support frame 9 is moved in the forward and reverse directions of the Y direction, and the position of the exchange moving body (sensing body) is set by similarly operating the knobs 26 and 27.

As a result, when each end of the embroidery frame 25 in the X and Y directions approaches the needle drop point, the X and Y edges that support the support frame 9
The magnets 16 of each holding body 13 in the direction are the sensing bodies 2
A detection signal is generated in opposition to 1.22, and the sewing machine is stopped to prevent the needle 4 from engaging with the embroidery frame 25 and from forming a stitch outside the frame 25.

In this embodiment, the sewing machine is stopped in relation to the generation of a detection signal during sewing, but instead of this embodiment, a movement position detection means such as a potentiometer may be arranged in relation to each moving body. , at the time of setting, the number of steps of the stepping motor when moving between the sensing bodies 21 and 24 is counted to detect the amount of movement of the moving body, and the embroidery frame 2 to be used is
The permissible needle drop range in both X and Y directions in 5 is calculated and stored in advance as data, and if the pattern (character) data to be embroidered exceeds the permissible range, the sewing machine cannot be started or an alarm is generated. You can also set it to do so.

Further, the permissible range can be set arbitrarily, and may be set within the range indicated by the broken line A in FIG.

Furthermore, in this embodiment, each movable body is operated manually, but each movable body may be connected to a drive means such as a motor and set to be electrically operated in conjunction with the operation of a button switch, etc. You may.

Further, in this embodiment, the magnet is fixed to the support frame and the detection body is provided to the movable body, but the arrangement may be reversed. In the case where the embroidery frame is connected to the embroidery frame, the object to be detected or the object to be detected may be placed in the embroidery frame.

Further, in this embodiment, a magnetic detection means such as a magnet and a Hall element is shown, but an optical detection means may also be used.

Furthermore, in this embodiment, a pair of movable bodies are arranged sandwiching the frame portion of the support frame, but both movable bodies are disposed outside or inside the frame, and the object to be detected or the sensing body is placed outside or inside the frame. It may be arranged to protrude inward.

As described above, according to this invention, when the object to be detected 16 and the object to be detected are facing each other, the sensing elements 21 and 22 that generate detection signals are connected to each other, and one side is connected to the
A pair is arranged so that one part is fixed to each end along the X direction or the Y direction, and the other is movable and locked separately along the moving path in the X direction or Y direction, so that the needle of the sewing machine is in the frame. By making it possible to move and lock the sensing body and the detected body so that they face each other in accordance with the position close to both ends of the body in the X direction or Y direction, the needle approaches the frame body during sewing. Then, a detection signal is generated from the detection means, so if you set the sewing machine to stop when the detection signal is generated, you can prevent the needle and embroidery frame from engaging and damaging both, and also prevent stitches from forming outside the frame. In addition, when sewing, the possible embroidery range within the frame is calculated from the detection signal and stored in advance, and if the embroidery data exceeds this range, the sewing machine cannot be started or an alarm is generated. By setting it to By changing the movement locking position of the needle, effects such as being able to always reliably detect the position where the needle approaches the frame can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the embroidery sewing machine of this embodiment, FIG. 2 is a perspective view of the connecting means, and FIGS. 3 and 4 are plan views for explaining frame edge detection.

Claims (1)

[Claims for Utility Model Registration] A base 1 on which a sewing machine with a needle that moves up and down in conjunction with the main shaft is placed on a horizontal upper surface, and a cloth stretched within the frame so that it can be held in a straight line on the upper surface of the base. Frames 9 and 25 are movable in the X direction along the X direction and in the Y direction perpendicular to the X direction, and are electrically controlled to connect the frames so that they can be stopped individually in the X direction or the Y direction. In an embroidery sewing machine having a driving means, the detection object 16 and the detection objects 21 and 22 which generate detection signals in relation to the detection object facing each other are arranged so that one of them is directed in the X direction or the Y direction of the frame. One part is fixed to each end along the X-direction or the Y-direction, and the other is arranged in pairs so that it can be moved and locked separately along the moving path in the X direction or Y direction, so that the needle of the sewing machine can be moved in the X direction of the frame. Alternatively, an embroidery frame moving position detecting device is characterized in that the detecting body and the detected body can be moved and locked so that they face each other in correspondence with positions close to both ends in the Y direction.