JPH0444638Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) The present invention is for holding a workpiece holder in a sewing machine that holds a workpiece such as cloth and moves within a predetermined plane in synchronization with the reciprocating movement of a needle. Regarding equipment.

(Conventional technology) This type of work holder holding device
GB2125073A Publication, Utility Model Application Publication No. 1987-140792 and
It is disclosed in DE3201014C1 publication.
In the holding device disclosed in GB2125073A, holding grooves are formed substantially orthogonally to each other at both ends of a bifurcated holding arm on the carriage side that moves within a predetermined plane in synchronization with the reciprocating movement of the needle. Stop pins at the tips of the left and right holding straps fixed to the frame are respectively inserted into the holding grooves, and the nuts screwed onto the pins are pressed against the holding arms by spring action. ing. Mikiakiaki
In the holding device disclosed in Japanese Patent Publication No. 60-140792, the embroidery frame is held in pressure contact with three parts: the supports at the ends of the left and right swing links attached to the feed frame, and the fixing part formed on the feed frame, and the embroidery frame is The embroidery frame is fixedly held by the screwing action of the setscrew for fixing the link. In the holding device disclosed in DE3201014C1, the embroidery frame is latched and held by a support pin on the carriage side and a latching lever that is subjected to the action of a spring, and can be attached with one touch against the action of the spring.

(Problem to be solved by the invention) When the embroidery frame is moved, an inertial force corresponding to the weight of the embroidery frame and the supported cloth acts in the plane direction. Since the attachment of the embroidery frame to the carriage side utilizes the operational displacement of the embroidery frame within the movement plane of the carriage side, the direction in which this inertial force acts also includes the attachment direction of the embroidery frame. Therefore, especially in the case of heavy cloth, there is a risk that the embroidery frame may move against the pressure action or the spring action. Such fluctuations result in a lack of synchronization with the required reciprocating movement of the needle and inhibit the formation of the desired pattern.

Structure of the invention (means for solving the problem) Therefore, this invention consists of a work holder mounting body that moves within a predetermined plane in synchronization with the reciprocating motion of the needle, and a work holder that holds a work such as cloth. The work holder mounting body is provided with an elastic action member that connects the work holder by engaging it with an engagement surface parallel to the plane, and that biases and joins the work holder in a right angle direction from above the engagement surface, and the elastic action member The work holder holding device is configured such that the work holder can be engaged with and removed from the mounting body against the elastic action of the member.

(Function) That is, the work holder is restricted from moving in the plane direction due to the engagement relationship with the work holder attachment body, and in addition to this restricted state, the work holder Biased in the right angle direction, the work holder is firmly and securely held in the mounting body. Therefore, all the inertial force on the work holder side that occurs during the movement in the plane direction is absorbed by the engagement relationship, and does not act in the attachment/detachment direction of the work holder. This ensures precise synchronization of the movement of the work holder with respect to the reciprocating movement of the needle while providing ease of operation for attaching and removing the work holder.

(Example) Hereinafter, the first and second embodiments embodying the present invention will be described.
This will be explained based on the diagram.

Sewing machine body 2 mounted on sewing machine table 1
A needle 3 is attached to the lower part of the arm portion 2a so as to be able to reciprocate up and down, and a needle hole 4a is formed in the throat plate 4 on the bed portion 2b constituting the sewing machine body 2. A pair of pulse motors M1 and M2 are arranged facing each other on the side of the arm portion 2a, and both motors M
A prismatic drive rod 7 that transmits the drive force of one pulse motor M1 and a drive screw 8 that transmits the drive force of the other pulse motor M2 are parallel between the drive force transmission gear boxes 5 and 6 that support the motors 1 and M2. It is supported by the erection. A movable base 9 is supported on the drive rod 7 and the drive screw 8 in a slidable and screwable manner, and a pair of guide rods 10 and 11 are mounted on the movable base 9 so as to be orthogonal to the drive rod 7 and the drive screw 8. Tightened and fixed. both rods 1
A support stand 12 is fastened to the tips of the guide rods 10 and 11, and a work holder mounting body 13 is slidably supported on both guide rods 10 and 11 between the movable stand 9 and the support stand 12. ing. and,
It is wound between a spiral grooved guide roller 14 fixed to the drive rod 7 on both sides of the moving table 9 and a spiral grooved guide roller 15 rotatably supported on both sides of the support table 12. An endless wire 16 is tightly connected to the work holder mounting body 13,
The rotation of the drive rod 7 causes the mounting body 13 to slide on the guide rods 10,11.

The pulse motors M1 and M2 are operated based on commands from a control device (not shown) comprising a microcomputer or the like, and the control device sends operation commands to both motors M1 and M2 according to a preset sewing program. As a result, the work holder mounting body 13
are drive rod 7, drive screw 8 and guide rod 1.
The needle 3 is moved in a plane including 0 and 11 in synchronization with the reciprocating movement of the needle 3.

A pair of positioning pins 13a and 13b are provided on the sewing machine body 2 side on the work holder attachment body 13 in a protruding position parallel to the tip of the attachment body 13, and the heights of both pins 13a and 13b are set to have different heights. has been done. The tip side corner of the attachment body 13 on the higher positioning pin 13a side is formed into an arcuate portion 13c that smoothly connects to the tip of the attachment body 13. A leaf spring 17 as an elastic member is fixed to the lower surface of the mounting body 13 on the lower positioning pin 13b side, and its tip side is curved and disposed on the positioning pin 13b. A notch 17a is formed at the tip of the leaf spring 17 just above the positioning pin 13b, and is curved to such an extent that the tip of the leaf spring 17 comes into contact with the mounting body 13.

An angled connecting arm 19 is fixed to one side of the outer frame 18a of the work holder 18, which holds the cloth W between the outer frame 18a and the inner frame 18b.
The arm 19 has a notch formed therein with a positioning groove 19a into which the positioning pin 13a can fit, and a positioning hole 19b into which the positioning pin 13b can fit. The distance between the positioning groove 19a and the positioning hole 19b is equal to the distance between both positioning pins 13.
a and 13b, and the distance from the positioning groove 19a and positioning hole 19b to the base end 19c of the connecting arm 19 is equal to the arc portion 13c.
is set to be the same as the radius of

In order to attach the work holder 18 having such a configuration to the mounting body 13, the positioning pin 13a and the positioning groove 19a are fitted together as shown by the chain line in FIG. The connecting arm 19 is pushed between the tip side of the spring 17 and the mounting body 13. Furthermore, the connecting arm 19 resists the leaf spring 17.
is lifted and placed on the positioning pin 13b, and the base end 19c of the connecting arm 19 is pressed against the distal end of the mounting body 13. Then, by sliding it appropriately along the tip of the mounting body 13, the positioning pin 13
b and the positioning hole 19b match, and are fitted together by the elastic action of the leaf spring 17, so that the work holder 18 is held on the mounting body 13. In this embodiment, the work holder 18 is held by the work holder 1.
8 and the mounting body 13 are biased and pressed from above in the right angle direction, so that they are held securely and firmly. The work holder 18, which is mounted on the mounting body 13 with one touch, is connected to the pulse motor M1,
The actuation of M2 causes the rod to move in a plane parallel to the plane containing the drive rod 7, drive screw 8 and guide rods 10 and 11. With this movement, an inertia force corresponding to the weight of the work holder 18 and the cloth W is applied to the mounting body 13.
However, all this inertial force is applied to the positioning pin 1.
3a, 13b, there are no acting elements in the direction intersecting said plane. Therefore, the work holder 18 is pressed onto the mounting body 13 without shaking due to the elastic action of the leaf spring 17, and moves integrally with the mounting body 13, which moves in synchronization with the reciprocating movement of the needle 3. Therefore, the cloth W held on the work holder 18 moves in exact synchronization with the reciprocating movement of the needle 3, and a predetermined pattern is formed.

The work holder 18 can also be removed from the mounting body 13 by pressing the positioning pins 13a, 1 against the leaf spring 17.
A simple operation of pulling out the connecting arm 19 from the mounting body 13 is sufficient, and the work holder 18 can be attached and detached from the mounting body 13 very easily.

Of course, the present invention is not limited to the above-mentioned embodiments; for example, embodiments shown in FIGS. 3 to 6 are also possible.

In the embodiment shown in FIG. 3, the work holder mounting body 20
Locating pins 21a and 22a are protruded from a pair of left and right arm portions 21 and 22, and a leaf spring 23 similar to that of the previous embodiment is fixed to the positioning pin 22a side. Angled connecting arms 24, 2 are attached to the opposite frame sides of the work holder 18.
5 is fixedly attached, and one connecting arm 24 has a positioning groove 24a cut out therein.
A positioning hole 25a is formed in the other connecting arm 25. The attachment of the work holder 18 to the attachment body 20 is the same as in the previous embodiment, but the plate spring 23 is attached to the connecting arm 24 side at the time of attachment.
Since the acting force is small, the positioning pin 21a is formed with a retaining head 21b, and therefore the work holder 18 is removed from the mounting body 20 in the reverse order of the mounting order.

The embodiment shown in FIG. 4 is possible as a modification of the positioning pin 21a in the embodiment shown in FIG.
A pressure spring 28 is interposed between the nut 27 screwed onto the spring receiver 26 and the spring receiver 26 . Therefore, in addition to the retaining function, the work holder can be attached and detached by prying up the spring receiver 26, and the operation of attaching and detaching the work holder becomes even smoother.

In the embodiment shown in FIG. 5, a presser lever 32 that is biased to rotate about a shaft 30 on a work holder mounting body 29 by a leaf spring 31 is attached to a work holder.
A pair of positioning pins 32a and 32 protrude from the lower surface of the holding lever 32.
b is the positioning hole 33a, 33 on the connecting arm 33
b, and the hole 29 on the mounting body 29.
a, 29b. Further, a guide piece 33c is formed on one side edge of the connecting arm 33, and a guide piece 33c is formed on one side edge of the connecting arm 33.
The installation is guided along the side edge of the mounting body 29.

In the embodiment shown in FIG. 6, the presser lever 3 is rotatably biased by a leaf spring 31 as in the previous embodiment.
4 connects the connecting arm 35 to the work holder mounting body 36
Although the mounting body 36 and the work holder 18 are in pressure contact with each other, the engagement relationship between the mounting body 36 and the work holder 18 is
This is realized by a fitting concave portion 36a on the upper surface of the connecting arm 35 and a fitting convex portion 35a on the lower surface of the connecting arm 35.

Effects of the Invention As detailed above, in the present invention, a work holder and a work holder mounting body that is moved within a predetermined plane can be connected by engaging on a plane parallel to the plane, and the engagement surface The work holder holding device has a simple structure in which the work holder is force-joined from above in the right angle direction, so the work holder is held securely and firmly, and the inertia force on the work holder side that occurs when moving in the above-mentioned plane direction is reduced. The advantage is that the workpiece holder is received in the engagement relationship and does not cause any rattling, making it easy to attach and detach the workpiece holder, and ensuring accurate synchronization of the workpiece holder's movement with respect to the reciprocating movement of the needle. It has a great effect.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment embodying the present invention, FIG. 2 is a perspective view of a main part, and FIGS. 3 to 6 are perspective views of main parts showing other examples of the present invention. Work holder mounting body 13, 20, 29, 3
6. Work holder 18, connection arms 19, 24, 25, 33, 3 forming a fitting relationship with the mounting body
5. Positioning pins 13a, 1 forming a fitting relationship
3b, 21a, 21c, 22a, 32a, 32
b. Similarly, positioning grooves 19a, 24a, positioning holes 19b, 25a, 33a, 33b, leaf springs 17, 23, 31 as elastic acting members, holding levers 32, 34, and fitting convex portions forming a fitting relationship. 35a, a fitting recess 36a, and a cloth W as a workpiece.

Claims (1)

[Scope of utility model registration request] Work holder attachment bodies 13, 20, 29, 3 that are moved within a predetermined plane in synchronization with the reciprocating movement of the needle 3
6 and a work holder 18 holding a work such as cloth W can be connected by engaging with an engagement surface parallel to the plane, and urging the work holder 18 in a right angle direction from above the engagement surface. The elastic action members 17, 23, 31, 32, and 34 to be joined are provided on the work holder attachment bodies 13, 20, 29, and 36, and the elastic action members 17, 23, 31, 32, and 34 are A work holder holding device for a sewing machine, characterized in that the work holder 18 is configured to be able to be engaged with and removed from attachment bodies 13, 20, 29, and 36.