JP3169035B2 - Embroidery frame holder mounting structure of embroidery sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embroidery frame holder mounting structure for an embroidery sewing machine, and more particularly to an embroidery frame holder which can be easily mounted on a movable frame via a clamp mechanism provided on the embroidery frame holder.

[0002]

2. Description of the Related Art Conventionally, various embroidery sewing machines such as a single-head embroidery sewing machine having only one sewing machine arm and a multi-head embroidery sewing machine having a plurality of sewing machine arms have been used. For example, Japanese Patent Application Laid-Open No. 2-216253 discloses a method in which a plurality of sewing machine arms are provided, and a similar number of embroidery patterns are formed on a planar work cloth or a cylindrical or bag-like work cloth according to the number of these machine arms. Each of the plurality of flat frames or bag frames holding these work cloths is attached to a movable frame via an embroidery frame holder, and the movable frame is placed on a work table so that the work cloth can be simultaneously formed. In this state, it is driven in the X-axis direction by the X-axis drive motor via the X-axis drive mechanism, and
An embroidery sewing machine configured to be driven in the Y-axis direction by a Y-axis drive motor via a shaft drive mechanism has been proposed.

In this type of embroidery sewing machine, the front end of an embroidery frame holder is generally fixed to each of the left and right ends of the embroidery frame such as a flat frame or a bag frame with a plurality of screws. Therefore, the rear end of the embroidery frame holder is fixed to the rear side wall of the movable frame with a plurality of screws, and the embroidery frame is attached to the movable frame via the embroidery frame holder.

[0004]

As described above, in an embroidery sewing machine configured to attach an embroidery frame holder attached to an embroidery frame to a movable frame by screwing, a change in the size of a fabric on which embroidery is performed is required. When changing the size of the embroidery frame accordingly, or when replacing the embroidery frame for the flat frame with the embroidery frame for the bag, attach the embroidery frame holder to the movable frame for each of the plurality of embroidery frame holders. While removing all the screws using a screwdriver, the embroidery frame holder attached to the new embroidery frame will be screwed into the movable frame one by one, complicating the embroidery frame replacement work. There is a problem that a great deal of labor and work time are required for the replacement work.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an embroidery frame holder mounting structure for an embroidery sewing machine in which an embroidery frame holder having an embroidery frame mounted thereon can be easily and quickly mounted on a movable frame.

[0006]

An embroidery frame holder mounting structure for an embroidery sewing machine according to the first aspect of the present invention comprises a movable frame which is independently driven to move in two orthogonal directions, and an embroidery for attaching the embroidery frame to the movable frame. In an embroidery sewing machine with a frame holder,
A plurality of positioning pins for positioning the embroidery frame holder are provided on the upper surface side of the rear frame portion of the movable frame, and a horizontal wedge-shaped locking portion that is sharpened forward is provided on the lower surface side of the rear frame portion of the movable frame. At least one pair of U-shaped notches are formed at the rear end of the embroidery frame holder to fit into the positioning pins. A spring member detachably engaged with a positioning pin at a portion corresponding to the front side of the U-shaped notch portion on the upper surface side of the rear portion of the embroidery frame holder, and the spring member is set in a relaxed state and a tensioned state. And a clamp mechanism including a switching lever for switching.

[0007]

In the embroidery frame holder mounting structure of the embroidery sewing machine according to the first aspect, of the plurality of positioning pins provided on the upper surface side of the rear frame portion of the movable frame, a desired pair of positioning pins are attached to the embroidery frame. At least one pair of U-shaped notches formed at the rear end of the embroidery frame holder for mounting
The corresponding positioning pins are fitted into the notches. At this time, the positioning of the embroidery frame holder in the left-right direction with respect to the movable frame is performed by the U-shaped notch and the positioning pin. A clamp mechanism is provided at a position corresponding to the front side of the U-shaped notch on the rear upper surface side of the embroidery frame holder, so that a spring member of the clamp mechanism is engaged with the positioning pin, and By operating the switching lever of the clamp mechanism, the spring member is switched from the relaxed state to the tensioned state.

As a result, the embroidery holder is moved rearward through this clamp mechanism, so that the engaging portion formed on the lower surface side of the rear portion of the embroidery frame holder is connected to the lower surface of the rear frame portion of the movable frame. Pressing engagement is made by the spring force of the spring member with the horizontal wedge-shaped locking portion formed on the side, which is sharpened toward the front, so that the embroidery holder can be moved through the engagement between the engaging portion and the locking portion. The positioning of the embroidery holder in the vertical direction with respect to the frame is reliably performed, and the embroidery holder is securely attached to the movable frame by the clamp mechanism. On the other hand, when the switching lever of the clamp mechanism provided on the embroidery frame holder is switched from the tensioned state to the relaxed state, the engagement between the spring member and the positioning pin is released, and the embroidery frame holder is pulled forward, the U-shaped notch is formed. The engagement of the embroidery frame holder with the positioning pin is also released, and the embroidery frame holder can be easily removed from the movable frame.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a multi-head embroidery machine having three embroidery sewing machines. To explain the multi-head embroidery machine M, as shown in FIG.
A sewing machine support plate 2 is provided on an upper surface of a base frame 1 extending in the left-right direction. On the sewing machine support plate 2, three embroidery sewing machines MH are arranged in a line in the left-right direction at predetermined intervals. At the front end of the arm 3 of these embroidery sewing machines MH,
Needle bar cases 7 on which twelve needle bars (not shown) are vertically movably mounted are mounted, and the needle bar cases 7 are supported by a needle bar selection mechanism (not shown) so as to be movable in the left-right direction.

On the other hand, a bed body 5 at the lower end of the pillar 4 connected to the arm 3 is mounted on the sewing machine support plate 2, and a cylinder bed 6 extends from the front end of the bed body 5.
The front end (front end) of the cylinder bed 6 is provided with a thread catcher (not shown), and in cooperation with a sewing needle 8 attached to a selected needle bar, a desired color is obtained. The embroidery thread is used to form a seam on the work cloth.
Here, an upper shaft (not shown) for vertically moving the needle bar and the balance 9 and a lower shaft (not shown) for rotating the thread catcher are rotationally driven by a V-belt 10 connected to a sewing machine motor. .

The working table 1 is positioned so as to be flush with the upper surface of the cylinder bed 6 in front of the sewing machine support plate 2.
3 is provided, and includes a work table 13, and extends over a pair of auxiliary tables 14 and 15 provided on both left and right sides of the work table 13, and is movable in a rectangular frame shape in a plan view extending in the left-right direction. A frame 16 is placed. The drive frame 16a at the right end of the movable frame 16 is moved and driven in the X-axis direction (left-right direction) by an X-axis drive mechanism (not shown), and the drive frame 16b at the left end and the drive frame 16b. 16a
Are simultaneously moved and driven in the Y-axis direction (front-back direction) by a Y-axis drive mechanism (not shown).

Next, an embroidery frame holder mounting structure for mounting the embroidery frame 17 for holding the work cloth on the movable frame 16 will be described with reference to FIGS. By the way, the embroidery frame holders 20 for attaching the left and right ends of the embroidery frame 17 to the movable frame 16 are symmetrically configured in the same manner, so that the embroidery frame holder 20 for the right side will be described.

First, the movable frame 16 will be described. As shown in FIGS. 3 and 4, the embroidery frame holder 20 is positioned on the upper surface of the rear end of the rear frame 16c of the movable frame 16 in the left-right direction. A plurality of positioning pins 18 are screwed at their lower ends. The positioning pin 18 is circular in plan view, and has a lower half cylindrical portion 18a and an upper half flange portion 18b with an enlarged radius. on the other hand,
On the lower surface side near the front end of the rear frame portion 16c, a horizontal wedge-shaped locking portion 16d that is sharpened toward the front is formed over the entire width of the rear frame portion 16c.

Next, the embroidery frame holder 20 will be described. As shown in FIGS. 2 to 3 and FIGS. 5 to 6, the embroidery frame holder 20 includes a mounting portion 20a at a rear portion and a supporting portion 20b at a front portion of the mounting portion 20a. As shown, the right end of the embroidery frame 17 is supported. A pair of U-shaped notches 20c that fit into the positioning pins 18 are formed at the rear end of the mounting portion 20a. Also,
On the lower surface side of the front end of the mounting portion 20a, a mounting portion 20a
An engaging plate 21 covering substantially the entire width of the engaging plate 21 is fixed.
The rear end is bent obliquely rearward and downward, and the locking portion 16b
Is formed with an engaging portion 21a which can be engaged with.

Further, a clamp mechanism 25 for attaching the embroidery holder 20 to the movable frame 16 is attached to a portion of the attachment portion 20a corresponding to the front side of the U-shaped notch 20c. The clamp mechanism 25 will be described. As shown in FIGS. 5 and 7, a substantially U-shaped fixing plate 26 in front view is attached to a front side of the U-shaped notch 20c with a screw 27 in a front-rear direction. A switching lever 28 having a substantially U-shape as viewed from the front is fitted on the fixing plate 26 so as to cover the fixing plate 26 from above, and the fixing plate 26 and the switching lever 28 are connected to a support shaft 29 at a rear end thereof. Concatenated,
The switching lever 28 is pivotally supported via this support shaft 29 so as to be able to swing up and down.

Insertion holes 28a are respectively formed in the left and right side walls of the switching lever 28 in front of the support shaft 29, and these insertion holes 28a have circular engagement rings made of a spring material (corresponding to a spring member). The switching lever 28 is substantially upright as shown by a two-dot chain line in FIG. 6 to move the engagement ring 30 rearward to a relaxed state. The position can be switched between a position and a tensioned position where the engagement ring 30 is moved forward to be tensioned by being tilted forward as shown by a solid line.

Next, the operation of attaching the embroidery frame holder 20 to the rear frame 16c of the movable frame 16 will be described with reference to FIGS. A pair of U-shaped notches 20c formed on the mounting portion 20a of the embroidery frame holder 20 correspond to a desired pair of positioning pins 18 among the plurality of positioning pins 18 provided on the rear frame portion 16c. Then, each U-shaped notch 20c is made to correspond to the cylindrical portion 18a of the positioning pin 18.
Fit into each. At this time, the U-shaped notch 20c and the positioning pin 18 position the embroidery frame holder 20 relative to the movable frame 16 in the left-right direction.

Then, the mounting portion 2 of the embroidery frame holder 20
0a, the switching lever 28 of the clamp mechanism 25
Is rotated to the relaxed position, and the rear end of the engagement ring 30 is engaged with the flange 18b of the positioning pin 18 from the rear side. At this time, the engaging portion 21a formed on the engaging plate 21 is
6c is opposed to the locking portion 16d from the front side. In this state, the switching lever 28 is rotated from the relaxed position to the tensioned position. At this time, the engagement ring 30 is
Is turned to the tension position, the front portion is pulled forward, and the reaction causes the mounting portion 20a to move rearward, and the engaging portion 21a is pressed and engaged with the locking portion 16d, and the mounting portion 2a is pressed.
The upper and lower positions of the engaging portion 21a and the locking portion 16d
Is positioned by engagement with

Then, the switching lever 28 is further rotated so that the insertion hole 28a of the switching lever 28 is
When the switch lever 28 moves downward from a straight line connecting the position of engagement with the positioning pin 18 and the support shaft 29, a downward turning force acts on the switching lever 28, and the lower end of the switching lever 28 is attached to the mounting portion. 20a is held in contact with the upper surface.
Thus, the embroidery frame holder 20 can be easily and securely attached to the rear frame portion 16c in a short time.

On the other hand, when the switching lever 28 is switched from the tensioned position to the relaxed position, the engagement between the engagement ring 30 and the positioning pin 18 is released, and the embroidery frame holder 20 is pulled forward, the U-shaped notch is formed. The engagement between the positioning pin 20c and the positioning pin 18 is also released, and the embroidery frame holder 20 can be easily removed from the movable frame 16.

Here, the embroidery frame 17 is moved to the embroidery frame holder 20.
The attachment to the support portion 20b will be briefly described with reference to FIGS. A locking pin 35 is attached to a front end of the support portion 20b, and a rear end portion of a holding plate 36 made of a plate-like spring material is fixed to the rear support portion 20b. Then, with the front end of the holding plate 36 being lifted up by hand, the support plate 37 attached to the embroidery frame 17 is moved to the lower side of the holding plate 36, and a locking pin is inserted into a pin hole formed therein. After the engagement of the support plate 35, the support plate 37 is elastically urged from above by the press plate 36. Thereby, the support plate 37, that is, the embroidery frame 17 is securely attached to the support portion 20b.

The engagement ring 3 of the clamp mechanism 25
Instead of 0, a plate-shaped spring member may be pivotally supported by the switching lever 28, and the rear end of this spring member may be engaged with the positioning pin 18 from behind. In addition, the clamp mechanism 2
5 may have various configurations including a spring member and a switching lever. It should be noted that various changes may be made to the mechanism of each part of the embodiment based on existing technology or technology obvious to those skilled in the art within the scope of the technical idea of the present invention.

[0023]

As described above, according to the embroidery frame holder mounting structure of the embroidery sewing machine of the first aspect, a plurality of positioning pins are provided on the upper surface side of the rear frame portion of the movable frame, and the lower surface side is provided with a plurality of positioning pins. While forming a wedge-shaped locking portion, a U-shaped notch is formed at the rear end of the embroidery frame holder, an engaging portion is provided on the lower surface side of the rear portion of the embroidery frame holder, and a clamp mechanism is provided on the upper surface side of the rear portion. The embroidery frame holder is positioned in the left-right direction by fitting the U-shaped notch into the positioning pin, and then simply switching the switching lever from the relaxed state to the tensioned state with the spring member engaged with the positioning pin. The engaging portion is engaged with the locking portion, and the embroidery holder can be easily, reliably, and quickly mounted on the movable frame by the clamp mechanism. Further, the embroidery frame holder can be easily removed from the movable frame simply by switching the switching lever to the relaxed state, releasing the engagement between the spring member and the positioning pin, and pulling the embroidery frame holder forward.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a multi-head embroidery machine according to an embodiment.

FIG. 2 is a schematic plan view of a multi-head embroidery machine to which an embroidery frame is attached.

FIG. 3 is a plan view of an embroidery frame holder attached to a movable frame.

FIG. 4 is a vertical sectional side view taken along the line AA of FIG. 3;

FIG. 5 is an enlarged plan view of the embroidery frame holder.

FIG. 6 is a vertical sectional side view taken along the line BB of FIG. 3;

FIG. 7 is a view shown by an arrow C in FIG. 3;

[Explanation of symbols]

 M Multi-head type embroidery machine 16 Movable frame 16c Rear frame 16d Locking part 18 Positioning pin 20 Embroidery frame holder 20c U-shaped notch 21a Engaging part 25 Clamp mechanism 28 Switching lever 30 Engagement ring

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-216253 (JP, A) JP-A-6-2254 (JP, A) JP-A-5-179559 (JP, A) 54462 (JP, B2) JP 3-21666 (JP, B2) JP 1-39743 (JP, Y2) JP 1-24157 (JP, Y2) JP 4-44638 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) D05C 9/00-9/22 D05B 39/00

Claims (1)

(57) [Claims] 1. An embroidery sewing machine having a movable frame independently driven to move in two orthogonal directions, and an embroidery frame holder for attaching an embroidery frame to the movable frame. A plurality of positioning pins for positioning the embroidery frame holder are provided on an upper surface side, and a horizontal wedge-shaped locking portion that is sharpened forward is formed on a lower surface side of a rear frame portion of the movable frame, and the embroidery frame holder is provided. At the rear end of
At least one pair of U-shaped cutouts respectively fitted to the positioning pins are formed, and an engaging portion for engaging with the locking portion is provided on a lower surface side of a rear portion of the embroidery frame holder. A clamp mechanism including a spring member detachably engaged with a positioning pin and a switching lever for switching the spring member between a relaxed state and a tensioned state, at a portion corresponding to the front side of the U-shaped notch on the upper surface side. An embroidery frame holder mounting structure for an embroidery sewing machine, which is provided.