JPH09119059A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine capable of accurately moving and controlling an embroidery frame even when the number of sewing machine heads is large. SOLUTION: This sewing machine comprises a frame driving substrate 10, arranged on a horizontal sewing machine table 6 and moved in the Y-direction so as to enable the free reciprocation with a Y-direction driving part 11 installed under the sewing machine table 6. The frame driving substrate 10 is equipped with an X-direction driving part 47 and connecting units 45 connecting a frame unit 46 are arranged so as to enable the free reciprocation in the X-direction with the X-direction driving part 47. A guide unit 23 horizontally extended in the Y-direction is located on the frame driving substrate 10 and an engaging unit 24 sliding while engaging with the guide unit 23 within the moving range in the Y-direction is arranged on the frame driving substrate 10. The engaging unit 24 is connected to an auxiliary driving mechanism 50 capable of driving an intermediate part in the longitudinal direction of the frame driving substrate 10 in the Y-direction synchronously with the Y-direction driving part 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine having an improved frame drive mechanism for controlling the movement of an embroidery frame that stretches and holds a sewn product such as cloth to be embroidered.

[0002]

2. Description of the Related Art A drive mechanism for controlling movement of an embroidery frame located on a horizontal sewing machine table in X and Y directions (left and right and front and rear) of X and Y coordinates based on sewing data such as embroidery data in a computer. Conventionally, various types have been proposed and implemented. For example, FIG. 7 shows an embroidery sewing machine (hereinafter referred to as “sewing machine”) provided with two sewing machine heads 5 and 5, and this sewing machine has an embroidery frame 46 on the sewing machine table 6 (that is, an original fabric as an embroidered material is spread). A long frame driving base 10 for holding a so-called original frame), and the embroidery frame 46.
Mechanism 30 for moving the table in the front-back direction (hereinafter referred to as “Y direction”) and the left-right direction (hereinafter referred to as “X direction”) on the table.
And That is, a Y-direction drive unit 11 for moving the embroidery frame 46 in the Y-direction is arranged on the lower surface of the sewing machine table 6. The Y-direction drive unit 11 has pulleys rotatably supported at the front and rear ends thereof and a space between the pulleys. Belt 1 hung around
7 and a drive motor 14 and the like connected to each pulley at the rear end via a connecting shaft 13. Each belt 1
7, 17 and both ends of the frame drive base 10 are connected to the sewing machine table 6 through slits 12, 12 formed in the Y direction. Therefore, by controlling the forward and reverse rotations of the drive motor 14, the frame drive base 10 and the embroidery frame 46 held by the frame drive base 10 are moved in the Y direction.

Further, the embroidery frame 4 is provided inside the frame driving base 10.
An X-direction drive unit 47 that moves 6 in the X-direction is provided. The X-direction drive unit 47 includes pulleys 40 and 41 that are rotatably supported at the left and right ends, a belt 43 that extends between the pulleys 40 and 41, and a drive motor 44 that is directly connected to the right pulley 41. ing. The belt 4
3, connecting bodies 45, 45 are attached with a required space therebetween, and the embroidery frame 46 is attached to the front end portion of each connecting member 45 protruding from the front surface of the frame driving base 10. Therefore, the embroidery frame 46 can be moved in the X direction by controlling the forward / reverse rotation of the drive motor 44.

[0004]

In the drive mechanism 30 for moving the embroidery frame 46 in the Y direction and the X direction, the X direction drive section 47 for driving the embroidery frame 46 in the X direction has the frame drive base 10. The sewing machine table 6 can be miniaturized because it is installed inside the machine, and it is suitable for a sewing machine having a small number of sewing machine heads as in this example. By the way, in the small-sized embroidery sewing machine having the frame driving mechanism described above, a sewing machine of the type in which the number of sewing machine heads is increased,
That is, there has been a demand for a sewing machine of the type in which the number of sewing machine heads is slightly increased while suppressing the overall size by adopting the frame drive mechanism. However, if the number of sewing machine heads is increased, the total length of the frame driving base 10 is inevitably increased, the weight of the frame driving base 10 is increased, and the weight of the embroidery frame 46 attached thereto is also increased. In this case, since the frame drive base 10 is driven only by connecting both ends thereof to the Y-direction drive unit 11, the middle portion in the longitudinal direction thereof is likely to be distorted when the frame is driven. As a result, the frame feed of the embroidery frame 46 cannot be performed accurately, so that there is a problem that a so-called pattern shift occurs in the embroidery pattern between the sewing machine heads 5.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned drawbacks inherent in the sewing machine according to the prior art, and is a frame drive mechanism of a type suitable for a small sewing machine. It is an object of the present invention to provide a sewing machine having a configuration in which the embroidery frame can be accurately moved and controlled even if the number of sewing machine heads is large, despite the adoption of the above.

[0006]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and to achieve a desired object, the present invention is directed to an elongated frame drive base body which is disposed above a horizontal sewing machine table and extends in the X direction. And a connection body that is reciprocally arranged in the X direction in the frame drive base body and is detachably connected to a frame body that stretches and holds the sewn object. And an Y-direction driving unit that is disposed below the sewing machine table and is connected to both ends of the frame-driving base body to reciprocally drive the frame-driving base body in the Y-direction. A frame driving base in which a frame body connected to the connecting body is moved in the X direction and the Y direction on the sewing machine table by respectively driving the X direction drive unit and the Y direction drive unit. Located above
A guide body that extends horizontally in the Y direction is disposed on the frame drive base body and engages with the guide body, and the Y of the frame drive base body
Connected to an engaging body that is slidable within a range of movement in the direction and an engaging body that is arranged on the frame drive base, and the middle portion in the longitudinal direction of the frame drive base is synchronized with the Y direction drive part in the Y direction. It is characterized in that it is configured with an auxiliary drive mechanism that is driven to.

[0007]

By the auxiliary drive mechanism provided on the frame drive base, the intermediate part of the frame drive base is also moved and driven in the Y direction in synchronization with the Y direction drive part, so that the frame drive base is distorted in the longitudinal direction. It is moved and driven without occurring.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a sewing machine according to the present invention will be described below with reference to preferred embodiments with reference to the accompanying drawings. The same members as those already described in the section of the prior art will be designated by the same reference numerals.

(Regarding the First Embodiment) FIGS. 1 to 5 show a first embodiment of a sewing machine according to the present invention. FIG. 1 is a plan view showing a partially broken sewing machine, and FIG. 2 is shown in FIG. It is a vertical side view of the sewing machine shown. An upper frame 3 is fixed horizontally between the support frames 2, 2 provided on the upper surfaces of the left and right sides of the leg 1. Two sewing machine heads 5, 5 are arranged on the front surface of the upper frame 3 at a predetermined interval, and a sewing machine table 6 is provided below the upper frame 3.
Are arranged horizontally. The sewing machine table 6 includes a fixed table 6a located at the rear and a movable table 6b located at the front, and the movable table 6b and the fixed table 6a are provided at the same height.

Below each of the sewing machine heads 5, cylinder-type hook support members 7, 7 are horizontally arranged. Each of the hook support members 7 has a base portion which has the support frames 2, 2
Is fixedly attached to the upper surface of the lower frame 8 that is hung between the lower end portions of the table 6, and the upper surface is set to a height that matches the upper surface of the table 6. A well-known hook (not shown) is provided inside the tip of the hook support 7, and sewing such as embroidery is performed by the cooperation of this hook and the sewing needle at the lower end of the needle bar 5a of the sewing machine head 5. Be done.

On the upper surface of the fixed table 6a, a frame drive base 10 extending in the X direction (horizontal direction) is provided.
The Y-direction drive unit 11 in the main drive mechanism 30 which is arranged in parallel with the both ends of which is arranged on the lower surface of the fixed table 6a.
(See FIG. 1). This Y-direction drive unit 11
Is a well-known mechanism having, as main components, pulleys 15 and 16 arranged at both front and rear ends on the lower surface of the sewing machine table 6a, and belts 17 and the like wound around these pulleys 15 and 16, and each drive pulley is connected. It is connected to a drive motor 14 via a shaft 13. Further, a connecting member (not shown) connected to both belts 17 and 17 extends upward from the slits 12 and 12 in the Y direction (front and rear direction) formed on the fixed table 6a, and is provided at both ends of the frame driving base 10. Each is connected. Therefore, the frame drive base 10 is configured such that the belts 17, 17 are moved in a desired direction by controlling the forward and reverse rotations of the drive motor 14, and are moved in the Y direction together with the connecting members of the belts 17, 17. There is.

Inside the frame drive base 10, the main drive mechanism 3 is used to move the embroidery frame 46 as a frame in the X direction.
An X-direction drive unit 47 forming a part of 0 is arranged. In the X-direction drive unit 47, a belt 43 is stretched between pulleys 40 and 41 that are rotatably supported at both left and right ends, and the pulley 41 is attached to a motor shaft of a drive motor 44 fixed to the frame drive base 10. Are combined. The two running bodies 45, 45 are provided in the straight running portion on the front side of the belt 43.
Are attached at a predetermined interval, and a rectangular embroidery frame 46 placed on the sewing machine table 6 is connected to the front ends of the two connecting bodies 45, 45 projecting forward from the frame drive base 10. The embroidery frame 46 can hold the original fabric as it is, and can also be attached with an individual embroidery frame (round frame or the like) corresponding to each sewing machine head 5. Instead of the embroidery frame 46, the individual embroidery frames are respectively connected to the connecting body 45.
It is also possible to attach directly to. As described above, the embroidery frame 46 is moved in the X direction by the main drive mechanism 30 including the Y direction drive unit 11 that moves the frame drive base body 10 in the Y direction and the X direction drive unit 47 that moves the connecting body 45 in the X direction. And Y
It can be moved in any direction.

Further, above the frame driving base 10, a support bracket 20 extending in the Y direction is disposed substantially horizontally at a substantially central portion of the sewing machine in the X direction (horizontal direction), and the front end portion thereof is the upper portion. It is fixed to the lower surface of the frame 3 via a bracket 21, and the rear end portion is fixed to a bracket 22 fixed to the rear surface of the lower frame 8. A linear rail 23 functioning as a guide is fixed to the lower surface of the support bracket 20, as shown in FIG. Also,
A slider 24 with a bearing is fixed to the upper surface of the frame driving base 10 via a spacer 25 as an engaging member movably arranged on the linear rail 23. Therefore, the frame drive base 10 has the slider 24 fixed on its upper surface.
Is always engaged with the linear rail 23 and moves, so that the displacement in the vertical direction is completely restricted.

Next, the auxiliary drive mechanism 50 provided on the frame drive base 10 will be described. Two support pins 51 and 52 are horizontally mounted vertically at a predetermined interval on the side surface of the vertical rod portion of the bracket 22 fixed to the lower frame 8, and the upper support pin 51 has two wires for wire wiring. Pulleys 53a, 53b are supported, and two pulleys 54a, 54b are similarly supported by the lower support pin 52.
Further, in front of the two lower pulleys 54a and 54b, a drive pulley 55 having a spiral groove formed on the outer circumference is fixed to the connecting shaft 13 connected to the drive motor 14. on the other hand,
In front of the two upper pulleys 53a and 53b, a pulley 57 is supported by a pin 56 fixed to the lower surface of the upper frame 3 in a suspended state. Each of these pulleys 53a, 53b,
A wire 58 is arranged between 54a, 54b, 55 and 57. Each terminal portion of the wire 58 is connected to the connecting tool 5 respectively.
8a, 58b is connected to the side surface of the spacer 25,
As shown in FIG. 5, while being oriented substantially horizontally from one of the connecting members 58a to the rear, and after being wound several times around the spiral groove of the drive pulley 55 via the pulleys 53a and 54a, it is passed through the pulleys 54b and 53b. Turn at the front pulley 57,
The other end is connected to the spacer 25.

When the connecting shaft 13 is rotationally driven by the forward / reverse rotation of the drive motor 14 by the above-mentioned mechanism, the drive pulley 55 fixed to the connecting shaft 13 is rotated to rotate the wire 5.
The spacer 25 is driven to move in the Y direction via 8 and the frame driving base 10 having the spacer 25 fixed thereto is driven to move back and forth. Here, the diameter of the drive pulley 55 is the Y-direction drive unit 1.
The driving speed by 1 and the driving speed by the wire 58 are set to be the same. Also, the connecting tools 58a, 2
The tension of the wire 58 can be adjusted on either one of 8b.

Therefore, in the sewing machine according to the present embodiment, the central portion of the frame drive base 10 is simultaneously moved at the same speed as both ends by the auxiliary drive mechanism 50 driven by the drive motor 14 which moves the frame drive base 10 in the Y direction. Since the frame drive base 10 is moved and driven, the frame drive base 10 is driven without distortion in the longitudinal direction. The embroidery frame 46 provided on the frame driving base 10 is accurately moved and driven, and so-called pattern shift of the embroidery pattern does not occur between the sewing machine heads 5.

(Second Embodiment) FIG. 6 shows a second embodiment of the sewing machine according to the present invention, which is equipped with an auxiliary drive mechanism 60 having a structure different from that of the first embodiment. Since the basic structure other than the auxiliary drive mechanism 60 is common to the first embodiment, the same members are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 6, the auxiliary drive mechanism 60 in the sewing machine of the second embodiment is pinned in a suspended state on a support portion 22a extending laterally from the upper portion of the vertical rod portion of the bracket 22.
(Not shown) is provided, and the pulley 61 is supported by this pin. On the front surface of the upper frame 3, a drive pulley 63 is fixed to the motor shaft of a drive motor 62 fixed downward by a bracket (not shown).
An endless timing belt 64 is stretched between 1,63. The belt 64 is connected to the side surface of the spacer 25 by a fixture 65, and the tension of the belt 64 can be adjusted by adjusting the position of the pin (not shown) that supports the pulley 61.

The drive motor 62 is driven in synchronization with the drive motor 14 of the main drive mechanism 30, and since the central portion of the frame drive base body 10 is driven to move at the same speed as both ends, The frame driving base 10 is driven without distortion in its longitudinal direction. Therefore, the embroidery frame 46 arranged on the frame driving base 10 is accurately moved and driven,
The so-called pattern shift of the embroidery pattern does not occur between the sewing machine heads 5.

In each of the embodiments described above, the frame drive base 1
Although the auxiliary drive mechanisms 50 and 60 are arranged in the approximate center of 0 to perform auxiliary drive, the auxiliary drive mechanisms 50 and 60 are installed at any position other than the central part or at a plurality of locations including the central part. You may do it. Further, although the linear guide member composed of the linear rail and the slider is illustrated as the guide body and the engaging body, the guide rail having the sliding surface formed on the lower surface is used instead of the linear rail, and the guide rail of the guide rail is used instead of the engaging body. It can be suitably implemented as a slider having a sliding surface formed on the upper surface that engages with the sliding surface.

[0021]

As described above, according to the sewing machine of the present invention, the auxiliary drive mechanism connected to the substantially middle portion of the frame drive base is provided, and the auxiliary drive mechanism is connected to both ends of the frame drive base. By controlling the frame drive base body in synchronization with the Y-direction drive unit, the movement of the frame drive base body is controlled at both end portions and the intermediate portion, so that no distortion occurs in the length direction. Therefore, the frame feed of the embroidery frame mounted on the frame drive base can be accurately performed, and the sewing such as embroidery is accurately performed according to the sewing data.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of a sewing machine according to a first embodiment of the present invention.

FIG. 2 is a vertical side view of the sewing machine shown in FIG.

FIG. 3 is a perspective view showing a mounting state of an auxiliary drive mechanism.

FIG. 4 is a perspective view showing an engagement relationship between a guide body and an engagement body.

FIG. 5 is a perspective view showing a wire arrangement state of an auxiliary drive mechanism.

FIG. 6 is a perspective view showing a mounting state of an auxiliary drive mechanism in the sewing machine according to the second embodiment of the present invention.

FIG. 7 is a plan view showing a partially broken sewing machine according to the related art.

[Explanation of symbols]

 6 Sewing machine table 10 Frame drive base 11 Y direction drive section 14,62 Drive means (drive motor) 23 Linear rail (guide) 24 Slider (engagement body) 45 Connected body 46 Embroidery frame (frame body) 47 X direction drive section 50 , 60 Auxiliary drive mechanism

Claims (3)

[Claims] 1. A long frame drive base (10) disposed in the upper part of a horizontal sewing machine table (6) and extending in the X direction, and reciprocable in the X direction on the frame drive base (10). A connecting body (45) which is provided and is connected to a frame body (46) for holding and holding the sewn product in a detachable manner, and the frame drive base body (10).
An X-direction drive unit (47) for reciprocally driving the (45) in the X-direction, and the frame drive base member disposed below the sewing machine table (6).
A Y-direction drive unit (11) connected to both ends of the frame (10) to reciprocally drive the frame drive base body (10) in the Y-direction. The X-direction drive unit (47) and the Y-direction drive unit (11). ) Are respectively moved to move the frame body (46) connected to the connection body (45) in the X direction and the Y direction on the sewing machine table (6). A guide body (23) which is located above the (10) and extends horizontally in the Y direction; and the guide body (23) which is arranged on the frame drive base body (10).
And an engaging body (24) slidable within the movement range of the frame drive base body (10) in the Y direction, and an engaging body (24) arranged on the frame drive base body (10). An auxiliary drive mechanism (50, 60) for driving the middle portion of the frame drive base body (10) in the longitudinal direction in the Y direction in synchronization with the Y direction drive section (11)
A sewing machine characterized by being composed of and. 2. The auxiliary drive mechanism (50) uses a drive means (14) in the Y-direction drive section (11) as a drive source.
The listed sewing machine. 3. The auxiliary drive mechanism (60) uses, as a drive source, another drive means (62) driven in synchronization with the drive means (14) of the Y-direction drive section (11). The listed sewing machine.