JP2012007267A - Embroidery frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an embroidery frame with which processed fabric can be stretched in a short time by tilting a lever and in which the lever adjusted at an arbitrary titled angle prevents the stretched processed fabric from tilting in a loosening direction, thereby making it also possible to stretch processed fabrics with various thickness in a short time.SOLUTION: In an embroidery frame which includes a annular holding frame 21 and a pinching frame 25 for pinching and thus stretching a processed fabric between the pinching frame 25 and the holding frame 21, a cutting section 27 is formed on the pinching frame 25, and an adjustment fastener 30 is provided to connect the cutting section 27 between two ends 25l and 25r facing each other across the cutting section 27 of the pinching frame 25. The adjustment fastener 30 has an operation lever 43; an expanding and contracting mechanism for continuously expanding or contracting an opening of the cutting section 27 according to a tilted angle of the operation lever 43; and prevention mechanisms 41 and 45 for preventing the operation lever 43 from tilting the stretched processed fabric to a loosening direction.

Description

  The present invention relates to an embroidery frame that holds a work cloth during embroidery processing.

  The conventional embroidery frame fixes the work cloth by turning the adjustment screw of the outer frame by hand when the work cloth is stretched. Therefore, when embroidering many work cloths, etc., each time the work cloth is replaced, the adjustment screw is turned by hand to tighten or loosen the outer frame. There was a risk of hurting.

  Therefore, the applicant has proposed an embroidery frame or the like in which a work cloth can be framed by a one-touch operation in Patent Documents 1 and 2. However, these are links that use a link mechanism and can only be fixed at the position where the two links are in a straight line (dead point) (the work cloth relaxes during processing at a position before the dead point, Since the work cloth is relaxed and framed at the position past the dead point), in order to frame the work cloth of different cloth thickness (thickness that cannot be fixed at the dead point), Adjustment with an adjusting screw provided on the frame (holding frame) is necessary.

  On the other hand, Patent Documents 3 to 5 propose embroidery frames in which work cloths having different cloth thicknesses can be framed by a one-touch operation.

However, the embroidery frame described in Patent Document 3 adjusts the tightening amount of the outer frame by the operation member by adjusting an adjustment screw provided on the operation member in order to stretch the work cloth having different cloth thicknesses. For this reason, there is a risk that it takes time and pains to the fingertips.
In the embroidery frame described in Patent Document 4, since the work cloth is stretched by the urging force of a leaf spring provided on the inner frame, the work cloth may be loosened during the processing.
The embroidery frame described in Patent Document 5 can only be adjusted stepwise because the tip of the stopper fitting is hooked in the groove of the cap nut so that the adjustment lever pulled forward does not return to its original position. It was.

JP 2006-280900 A JP 2006-304909 A JP 2008-279184 A Japanese Patent No. 3953604 Utility Model Registration No. 3043342

  Therefore, according to the present invention, the work cloth can be framed in a short time by tilting the lever, and the lever adjusted to an arbitrary tilt angle tilts in the direction of loosening the work cloth stretched by the frame. An object of the present invention is to provide an embroidery frame in which the work cloths having different thicknesses can be stretched in a short time by preventing this.

  In order to solve the above-described problems, an embroidery frame of the present invention includes an annular holding frame, and a sandwiching frame that sandwiches a work cloth between the retaining frame and stretches the work frame. An embroidery frame in which an adjustment fastener is formed between both ends of the sandwiching frame that forms a separation portion and is opposed to each other at the separation portion, and the adjustment fastener is tiltable. A lever mounted on the shaft, an expansion / contraction mechanism that frames the work cloth by continuously expanding or contracting the opening of the separation portion according to the tilt angle of the lever, and an arbitrary tilt angle within the tilt range. And a preventive mechanism for preventing the adjusted lever from tilting in the direction of loosening the work cloth stretched by the frame.

  Here, as the holding frame, an endless frame whose entire circumference is closed can be used, and a frame in which the cut-off portion is connected with a coarse adjustment screw as in the conventional case can be used. The shape of the holding frame is not particularly limited, and examples thereof include a quadrangle, a polygon, a circle, and an ellipse. The sandwiching frame is an end frame provided with a separation portion, and can be formed in a shape similar to the holding frame. The combination of the holding frame and the sandwiching frame is not particularly limited, and the sandwiching frame may be assembled inside the retaining frame, or the sandwiching frame may be assembled outside the holding frame.

  Although it does not specifically limit as an aspect of an adjustment fastener, The aspect provided with a pair of piece part attached to the both ends of the clamping frame etc. can be illustrated. Moreover, when providing a pair of piece part attached to the both ends of the clamping frame, the aspect etc. which are provided with the guide mechanism which guides both piece parts to the frontage direction of a separation part can be illustrated.

  The aspect of the lever is not particularly limited, but may be tilted in the horizontal direction or tilted in the vertical direction. However, in the case of tilting in the vertical direction, the adjustment fastener is provided on the front side of the sewing machine so that the lever does not interfere with the head of the sewing machine or the like. In the case of tilting in the horizontal direction, since the lever does not interfere with the head of the sewing machine or the like, the adjustment fastener can be provided on either the front side or the back side of the sewing machine.

  The mode of the expansion / contraction mechanism is not particularly limited, and includes a cam that is attached to one end of the sandwiching frame and rotates as the lever tilts, and a pressing portion that is provided at the other end of the sandwiching frame and is pressed by the cam. The aspect etc. which are provided can be illustrated. For example, when the adjustment fastener includes a pair of pieces attached to both ends of the sandwiching frame, a cam is provided on one piece of the pair of pieces, and a pressing portion is provided on the other piece. A mode is mention | raise | lifted.

  The form of the prevention mechanism is not particularly limited, but the cylinder that rotates with the tilt of the lever and the cylinder that is tightened when the lever tilts in the direction of loosening the work cloth stretched around the frame. A mode provided with the torsion coil spring made can be illustrated. Here, the cylindrical body may be solid or hollow.

  According to the present invention, the work cloth can be framed in a short time by tilting the lever, and the work cloths having different thicknesses can be framed in a short time.

It is the top view and end surface enlarged view of the embroidery frame of the Example of this invention. It is a top view of the outer frame and inner frame of the embroidery frame. It is the perspective view and sectional drawing of the adjustment fastener vicinity of the embroidery frame. It is a disassembled perspective view of the adjustment fastener. It is a perspective view of the lock spring and eccentric cam of the adjustment fastener. It is a top view which shows the motion of the adjustment fastener. It is a top view which shows a motion of the cancellation | release lever of the adjustment fastener. It is a top view which shows the displacement of the lock spring of the adjustment fastener. It is a top view which shows the motion of the eccentric lever of the adjustment fastener, and a cancellation | release lever. It is a top view of the adjustment fastener when the work cloth from which cloth thickness differs is framed.

  Embodiments of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the embroidery frame 20 of this embodiment is attached to the frame drive mechanism 12 of the embroidery sewing machine. The frame drive mechanism 12 includes a pair of left and right arms 14 above the sewing bed 13, an X drive frame 15 that drives the arms 14 in the left-right direction, and a Y drive frame 16 that drives the X drive frame 15 in the front-rear direction. ing. The embroidery frame 20 is detachably attached to the attachment portion 17 of the arm 14 and is driven in the front-rear and left-right directions around the needle hole 19 of the needle plate 18 as the X drive frame 15 and the Y drive frame 16 move.

  As shown in FIGS. 1 and 2, the embroidery frame 20 includes an outer frame 21 as a substantially rectangular holding frame and an inner frame 25 as a sandwiching frame having a shape similar to the outer frame 21. As in the conventional case, the outer frame 21 is provided with an outer separation part 22 at one of the four corners, and is formed into an annular shape by connecting the outer separation part 22 with a coarse adjustment screw 24. Note that the outer frame may be an endless annular shape having no outer separation part and having a closed entire circumference.

  The inner frame 25 is provided with a pair of left and right handles 26 that are attached to and detached from the attachment portion 17 of the arm 14 via the connection piece 23. In addition, a separation portion 27 that does not restrain the work cloth 2 between the inner frame 25 and the outer frame 21 is formed in the center on the back side. That is, at the separation portion 27, the inner frame 25 is cut and the work cloth 2 is not sandwiched between the outer frame 21. As shown in FIGS. 3 to 5, between the left end 25 l and the right end 25 r of the inner frame 25 facing each other at the separating portion 27, an adjustment fastener 30 that connects the inner frame 25 outside the outer frame 21 is installed. Has been. The adjustment fastener 30 spans the outer frame 21 and is attached to the left and right ends 251 and 25r and connected to the left and right ends 25l and 25r. The operating lever 43 that is worn and tiltable in the horizontal direction, and the opening of the separating portion 27 is continuously enlarged or reduced according to the tilting angle of the operating lever 43, and the opening of the separating portion 27 is enlarged. The expansion / contraction mechanism that stretches the work cloth 2 and the operation lever 43 adjusted to an arbitrary tilt angle within the tilt range tilts in the direction in which the inner frame 25 is contracted (the direction in which the framed work cloth 2 is relaxed). And a guide mechanism for guiding the pair of left and right brackets 31 and 32 toward the frontage of the separating portion 27. In this embodiment, the inner frame 25 is formed of a synthetic resin elastic material and is formed into a substantially rectangular shape in plan view with a long side of about 45.5 cm and a short side of about 34.5 cm. It is designed to expand and contract with an opening size of about 1.1 cm.

  The pair of brackets 31 and 32 are formed by sheet metal so as to be substantially symmetrical with respect to each other, and the base end portions 31 a and 32 a are fixed to the inner surface of the inner frame 25 with screws 35. Moreover, the front-end | tip of each bracket 31 and 32 is the substantially rectangular flat plate part 31b and 32b long in the left-right direction. An eccentric pin 36 and two guide collars 37 that are spaced apart from each other are attached to the upper surface of the flat plate portion 31b of the first bracket 31 by screws 36c and 37c. On the flat plate portion 32 b at the tip of the second bracket 32, two guide grooves 38 having an oval opening elongated in the left-right direction are provided at corresponding positions of the guide collar 37. And the front-end | tip part 37e of the guide collar 37 is slidably fitted to the two guide grooves 38, respectively. The guide groove 38 and the guide collar 37 constitute a guide mechanism. Further, a substantially rectangular cutout 39 is formed at a corresponding position of the eccentric pin 36 in the middle of the long side direction of the flat plate portion 32b.

  An eccentric cam 40 that rotates about the eccentric pin 36 is fitted on the eccentric pin 36. The tip of the eccentric pin 36 is supported by a pin support 49 formed of sheet metal. Both ends of the pin support 49 are fixed to the two guide collars 37 by screws 49c.

  The eccentric cam 40 is a hollow cylindrical columnar portion 41 having an eccentric pin 36 inserted therein, and a circular plate-shaped cam that is on the proximal end side of the cylindrical portion 41 and whose center is eccentric from the axis of the eccentric pin 36. The cylindrical part 41 and the cam part 42 are rotated integrally with the eccentric pin 36 as a center. The cam portion 42 is inserted into the notch portion 39, and the side surface of the cam portion 42 is in contact with the left and right inner side surfaces 39 l and 39 r of the notch portion 39. Therefore, both the left and right inner side surfaces 39l and 39r are pressed against the side surface of the cam portion 42 by the rotation of the eccentric cam 40, and are thus pressing portions. The cam portion 42 has an opening through which the cylindrical portion 41 is inserted, and an operation lever 43 formed of sheet metal is fixed by a screw 43c. Therefore, the operation lever 43 is pivotally attached to the first bracket 31 so as to be tiltable about the eccentric pin 36 as a tilting center. Further, the eccentric cam 40 is rotatable about the eccentric pin 36 as the operation lever 43 is tilted. The eccentric cam 40 and the left and right inner side surfaces 39l and 39r of the notch 39 constitute an expansion / contraction mechanism.

  On the operating lever 43, a release lever 44 having an opening for inserting the cylindrical portion 41 and formed of sheet metal is provided with a washer 47 interposed. The release lever 44 is pivotally attached to the first bracket 31 so as to be tiltable about the eccentric pin 36 as a tilting center.

  A lock spring 45 that is a left-handed torsion coil spring (torsion spring) as shown in FIG. 5 is inserted between the release lever 44 and the pin support 49. An upper end 45u of the lock spring 45 is attached to the pin support 49 by a screw 45c, and a lower end 45d is attached to the release lever 44 by a screw 44c. Further, the coil portion 46 of the lock spring 45 is inserted with the tip of the cylindrical portion 41 by press-fitting and the eccentric pin 36 is inserted. Since the inner diameter (about 7.8 mm) of the coil portion 46 is slightly smaller than the outer diameter (about 8 mm) of the cylindrical portion 41, the portion of the coil portion 46 into which the cylindrical portion 41 is press-fitted is expanded to make the cylindrical portion 41 smaller. It is fitted. Therefore, the cylindrical portion 41 is tightened by the lock spring 45. And this lock spring 45 and the cylindrical part 41 comprise the prevention mechanism.

  Next, how to stretch the work cloth 2 on the embroidery frame 20 will be described. First, the function of continuously enlarging or reducing the frontage of the separation portion 27 according to the tilt angle of the operation lever 43 will be described. As shown in FIG. 6, by tilting the operation lever 43, the eccentric cam 40 rotates in the notch 39 around the eccentric pin 36 according to the tilt. Since the cam portion 42 is eccentric from the axial center of the eccentric pin 36 and the side surfaces thereof are in contact with the left and right inner side surfaces 391 and 39r of the notch portion 39, the eccentric cam 40 rotates to The relative position between the first bracket 31 and the second bracket 32 is continuously displaced. On the other hand, the tip portions 37e of the two guide collars 37 attached to the upper surface of the first bracket 31 are slidably fitted in the two guide grooves 38 of the second bracket 32, respectively. The bracket 31 and the second bracket 32 are displaced in the direction along the guide groove 38, that is, in the direction in which the opening of the separation portion 27 that is also in the left-right direction is enlarged or reduced. Therefore, by tilting the operation lever 43, the opening of the separating portion 27 is continuously enlarged or reduced, and the inner frame 25 is continuously enlarged or reduced.

  Specifically, by tilting the operation lever 43 clockwise (in the direction of the arrow x1 in FIG. 6A), the opening of the separating portion 27 is expanded and the inner frame 25 is expanded. On the contrary, by tilting the operation lever 43 counterclockwise (in the direction of the arrow x1 in FIG. 6C), the opening of the separation portion 27 is narrowed and the inner frame 25 is contracted. More specifically, as shown in FIG. 6a, the cam portion is tilted clockwise by tilting the operation lever 43 of the inner frame 25 in the most contracted state (the opening of the separation portion 27 is about 3 mm). The side surface 42 presses the right inner side surface 39r of the notch 39, the inner frame 25 is enlarged, and the gap between the inner frame 25 and the outer frame 21 is reduced as shown in FIG. Then, by further tilting the operation lever 43 in the clockwise direction, the inner frame 25 is further expanded, and as shown in FIG. 6c, in the most expanded state (the opening of the separation portion 27 is about 11 mm). By becoming the inner frame 25, there is no gap between the inner frame 25 and the outer frame 21, and the inner frame 25 is inscribed in the outer frame 21. On the contrary, as shown in FIG. 6c, the cam portion 42 of the cam portion 42 is enlarged by tilting the operation lever 43 of the inner frame 25 in the state inscribed in the outer frame 21 counterclockwise. The side surface presses the left inner side surface 39l of the notch 39, and the inner frame 25 shrinks, so that a gap is formed between the inner frame 25 and the outer frame 21, as shown in FIG. Then, by further tilting the operation lever 43 in the counterclockwise direction, the inner frame 25 is further reduced, and the gap between the inner frame 25 and the outer frame 21 is increased as shown in FIG.

  Next, the function of preventing the operation lever 43 from being tilted by the lock spring 45 will be described. As shown in FIG. 5, a part of the coil portion 46 of the lock spring 45 expands in diameter to the cylindrical portion 41 of the eccentric cam 40 so as to be fitted to each other, and the coil portion 46 of the lock spring 45 is in close contact with each other. The cylindrical portion 41 is tightened, and strong friction is generated between the coil portion 46 of the lock spring 45 and the cylindrical portion 41 of the eccentric cam 40. Further, since the lock spring 45 has the upper end 45 u attached to the pin support 49, the lock spring 45 is difficult to rotate together with the eccentric cam 40. Therefore, the operation lever 43 is prevented from being tilted by the lock spring 45.

  Next, the function of releasing the tightening of the cylindrical portion 41 of the eccentric cam 40 by the lock spring 45 by tilting the release lever 44 will be described. As shown in FIGS. 7 and 8, the lower end 45 d of the lock spring 45 is attached to the release lever 44. Therefore, when the release lever 44 is pressed and tilted clockwise from the state shown in FIG. 7A (in the direction of the arrow in FIG. 7A) to the state shown in FIG. The position of the lower end 45d is also displaced from the position shown in FIG. 7a and FIG. 8a to the position shown in FIG. 7b and FIG. 8b. As the position of the lower end 45d is displaced in this way, as shown in FIG. 8, the coil portion 46 of the lock spring 45 (particularly, the portion where the cylindrical portion 41 is press-fitted because it is close to the lower end 45d) has an increased diameter. As shown in FIG. 8 b, a gap is generated between the cylindrical portion 41 and the coil portion 46. Alternatively, the tightening of the cylindrical portion 41 by the coil portion 46 of the lock spring 45 is loosened until no gap is generated. Therefore, the tightening of the cylindrical portion 41 of the eccentric cam 40 by the coil portion 46 of the lock spring 45 is released, the eccentric cam 40 can be rotated, and the operation lever 43 can also be tilted. On the other hand, when the pressing of the release lever 44 is stopped, the coil portion 46 (particularly, the portion where the large-diameter cylindrical portion 41 is press-fitted since it is close to the lower end portion 45d) is reduced in diameter by the elasticity of the lock spring 45. As shown in FIG. 8a, the cylindrical portion 41 is fastened again. Further, when the diameter of the coil portion 46 is reduced, the position of the lower end portion 45d is displaced, and the release lever 44 tilts counterclockwise (in the direction of the arrow b in FIG. 7).

  Next, the tilting of the operation lever 43 will be described. As shown in FIG. 9a, the operation lever 43 is tilted clockwise (in the direction of the arrow x1 in FIG. 9a, and the inner frame 25 is enlarged by tilting the operation lever 43 in this direction). If it tries to do so, the torque (the operation lever 43 and the eccentric cam 40 are made to rotate clockwise) which makes the lock spring 45 rotate clockwise by strong friction with the coil part 46 of the lock spring 45, and the cylindrical part 41 of the eccentric cam 40. Is also transmitted to the lock spring 45 from the eccentric cam 40, and the lock spring 45 tries to move with the eccentric cam 40 in the clockwise direction. Therefore, the coil portion 46 of the lock spring 45 tries to expand its diameter against its own elastic force, and the tightening of the eccentric cam 40 by the lock spring 45 is loosened, and the operation lever 43 can be tilted clockwise. Then, by tilting the operation lever 43 clockwise, the lower end portion 45d of the lock spring 45 rotates clockwise about the eccentric pin 36 due to the accompanying movement with the eccentric cam 40. Therefore, the release lever 44 to which the lower end 45d is attached tilts in the clockwise direction.

  By the way, since the coil portion 46 is expanded in diameter, the friction between the lock spring 45 and the eccentric cam 40 is reduced, so that the torque transmitted from the eccentric cam 40 to the lock spring 45 is reduced. Therefore, the lower end portion 45d of the lock spring 45 is displaced to a point where the torque transmitted from the eccentric cam 40 and the elastic force of the coil portion 46 are balanced. Then, as shown in FIG. 9b, the release lever 44 tilts together with the operation lever 43 to a position where the lock spring 45 maintains a balance (a position tilted by about 5 ° clockwise). Thereafter, as shown in FIG. 9c, only the operation lever 43 is tilted clockwise while the release lever 44 is maintained in that state. Then, as shown in FIG. 9c, when the tilting of the operation lever 43 is stopped, the release lever 44 is rotated counterclockwise (arrow C in FIG. 9) by the elastic force of the lock spring 45 generated by the diameter expansion of the coil portion 46. 9 d), the state shown in FIG. 9 d is reached, and the cylindrical portion 41 of the eccentric cam 40 is tightened by the coil portion 46 of the lock spring 45. Since the coil portion 46 having an enlarged diameter is reduced in diameter while being rotated counterclockwise, the lock spring 45 is reduced in diameter when the operation lever 43 is tilted counterclockwise as the lock spring 45 is reduced in diameter. Hold down the operating lever 43 with your hand or the like.

  On the other hand, as shown in FIG. 9d, when the operation lever 43 is tilted counterclockwise (in the direction of the arrow d in FIG. 9), the torque for rotating the lock spring 45 counterclockwise is also increased. As a result, the tightening of the cylindrical portion 41 of the eccentric cam 40 by the coil portion 46 of the lock spring 45 becomes harder and the friction becomes stronger. Therefore, the release lever 44 cannot be tilted counterclockwise while being stopped by the lock spring 45.

Next, a case where two types of work cloths 2 and 3 having different cloth thicknesses are framed on the embroidery frame 20 will be described.
First, as shown in FIG. 6c, when the inner frame 25 is most enlarged (when the tilt angle of the operation lever is 180 °), a rough gap is formed in advance so that no gap is generated between the inner frame 25 and the inner frame 25. The size of the outer frame 21 is adjusted with the adjusting screw 24.
Next, when the work cloth 2 (thickness t2) is framed, the operation lever 43 is tilted clockwise to enlarge the inner frame 25. As shown in FIG. When the tilt angle of 43 is α2, which is smaller than 180 °, the operation lever 43 becomes heavier, the work cloth 2 is sandwiched between the outer frame 21 and the inner frame 25, and the work cloth 2 is stretched. . Further, since the eccentric cam 40 is tightened by the lock spring 45, the work cloth 2 is stretched without being loosened in this state. Further, when the work cloth 2 stretched by the frame is removed from the embroidery frame 20, the release lever 44 is tilted clockwise to release the tightening of the eccentric cam 40 by the lock spring 45, and the counterclockwise tilt is possible. The operation lever that has become is tilted counterclockwise, the gap between the outer frame 21 and the inner frame 25 is increased, and the work cloth 2 is removed from the embroidery frame 20.

  On the other hand, when the work cloth 3 thicker than the work cloth 2 (thickness t3, t3> t2) is framed, when the operation lever 43 is tilted clockwise, as shown in FIG. When the tilt angle of the operation lever 43 is α3 which is smaller than α2, that is, when the inner frame 25 is smaller than when the work cloth 2 is framed, the operation lever 43 becomes heavier, and the outer frame 21 and the inner frame 25 The work cloth 3 is sandwiched between them, and the work cloth 3 is framed. In addition, since the eccentric cam 40 is tightened by the lock spring 45, the work cloth 3 is stretched without being loosened in this state. Further, when removing the framed work cloth 3, it is performed in the same manner as the work cloth 2.

According to this example, the following effects were obtained.
-By tilting the operation lever 43 in the direction of enlarging the inner frame 25 (clockwise direction), the inner frame 25 can be enlarged, and the work cloth 2 can be easily stretched over the embroidery frame 20 in a short time. It was.
The tilting of the operating lever 43 in the direction of reducing the inner frame 25 (counterclockwise direction) is prevented by tightening the eccentric cam 40 by the lock spring 45, so that the work cloth 2 can be framed without being loosened during the processing. I was able to
The tilting of the operating lever 43 in the direction of enlarging the inner frame 25 is not prevented by the tightening of the eccentric cam 40 by the lock spring 45, so that the work cloth 2 can be clamped with one hand.
-By tilting the release lever 44 in the clockwise direction, the tightening of the eccentric cam 40 by the lock spring 45 is released, and the operation lever 43 can be tilted in a direction to reduce the inner frame 25, so that the inner frame 25 can be reduced easily. In addition, the work cloth 2 could be removed from the embroidery frame 20 in a short time.
The tilting of the operating lever 43 in the direction of reducing the inner frame 25 is prevented by the tightening of the eccentric cam 40 by the lock spring 45, so that even when the work cloth 3 thicker than the work cloth 2 is framed, the inner frame 25 The work cloth 3 can be framed only by reducing the tilting angle of the operation lever 43 in the direction in which it is enlarged.
Therefore, even when the work cloth 3 thicker than the work cloth 2 is stretched, it is not necessary to adjust the size of the outer frame 21 with the coarse adjustment screw 24, and the burden on the fingertip by rotating the coarse adjustment screw 24 is eliminated. No longer hurt your fingertips.

  In addition, this invention is not limited to the said Example, In the range which does not deviate from the meaning of invention, it can change suitably and can be actualized.

2 Work cloth 3 Work cloth (thick)
20 Embroidery frame 21 Outer frame 25 Inner frame 25l Left end 25r Right end 27 Separation part 30 Adjustment fastener 31 First bracket 32 Second bracket 36 Eccentric pin 37 Guide collar 38 Guide groove 39 Notch part 39l Left inner side surface 39r Right inner side surface 40 Eccentric cam 41 Cylindrical part 42 Cam part 43 Operation lever 44 Release lever 45 Lock spring

Claims (4)

An annular holding frame; and a clamping frame that sandwiches a work cloth between the holding frame and stretches the frame. A separation portion is formed in the clamping frame and is opposed to the separation portion. An embroidery frame in which an adjustment fastener for connecting the separation portion between both ends of the sandwiching frame is constructed,
The adjustment fastener includes a lever that is pivotally mounted, and an expansion / contraction mechanism that frames the work cloth by continuously expanding or contracting the opening of the separation portion according to a tilt angle of the lever. An embroidery frame comprising: a prevention mechanism for preventing the lever, which is adjusted to an arbitrary tilt angle within a tilt range, from tilting in a direction of loosening the work cloth stretched by the frame.   The prevention mechanism includes a cylindrical body that rotates as the lever tilts, and a torsion coil spring that is externally fitted to the cylindrical body that tightens the cylindrical body when the lever tilts in a direction to relax the work cloth stretched around the frame. The embroidery frame according to claim 1.   The expansion / contraction mechanism includes a cam that is attached to one end of the sandwiching frame and rotates as the lever tilts, and a pressing portion that is provided at the other end of the sandwiching frame and is pressed by the cam. Item 3. An embroidery frame according to item 1 or 2.   The said adjustment fastener is equipped with a pair of piece part attached to the both ends of the clamping frame, and the guide mechanism which guides this pair of piece part to the frontage direction of the said separation part. The embroidery frame according to any one of the above.

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