JP3656172B2 - sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sewing machine having an improved frame drive mechanism for moving and controlling an embroidery frame that stretches and holds a sewing product such as an embroidery cloth.
[0002]
[Prior art]
Conventionally, there are various drive mechanisms for controlling the movement of an embroidery frame located on a horizontal sewing table in the X and Y directions (left and right and front and rear) of the X and Y coordinates based on sewing data such as embroidery data in a computer. Are proposed and implemented. For example, FIG. 7 shows an embroidery sewing machine (hereinafter referred to as “sewing machine”) provided with two sewing heads 5, 5. A long frame driving base 10 for holding a so-called original fabric frame to be held, and the embroidery frame 46 are moved on the table in the front-rear direction (hereinafter referred to as “Y direction”) and the left-right direction (hereinafter referred to as “X direction”). And a drive mechanism 30 to be operated. That is, a Y-direction drive unit 11 for moving the embroidery frame 46 in the Y direction is disposed on the lower surface of the sewing machine table 6. The Y-direction drive unit 11 is supported between each pulley rotatably supported at the front and rear ends. And a drive motor 14 connected to each pulley at the rear end via a connecting shaft 13. The respective belts 17 and 17 and both ends of the frame drive base 10 are connected to the sewing machine table 6 through slits 12 and 12 formed in the Y direction. Therefore, by controlling forward / reverse rotation of the drive motor 14, the frame drive base 10 and the embroidery frame 46 held on the frame drive base 10 are moved in the Y direction.
[0003]
An X-direction drive unit 47 that moves the embroidery frame 46 in the X direction is disposed inside the frame drive base 10. The X-direction drive unit 47 includes pulleys 40 and 41 rotatably supported at both left and right ends, a belt 43 spanned between the pulleys 40 and 41, and a drive motor 44 directly connected to the right pulley 41. ing. Connected bodies 45, 45 are attached to the belt 43 at a required interval, 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 is moved in the X direction by controlling the forward / reverse rotation of the drive motor 44.
[0004]
[Problems to be solved by the invention]
In the drive mechanism 30 that moves the embroidery frame 46 in the Y direction and the X direction, the X direction drive unit 47 that drives the embroidery frame 46 in the X direction is provided inside the frame drive base 10. It is possible to reduce the size of the sewing machine table 6, and it is preferably implemented for a sewing machine with a small number of sewing heads as in this example. By the way, in the small embroidery sewing machine having the frame driving mechanism described above, the number of sewing machine heads is reduced while adopting the frame driving mechanism to suppress the overall size while adopting the type of sewing machine having an increased number of sewing heads. There has been a demand for sewing machines of a slightly larger type. However, if the number of sewing heads is increased, the total length of the frame driving base 10 is inevitably increased, and the weight of the frame driving base 10 is increased, and the weight of the embroidery frame 46 attached to the frame driving base 10 is also increased. In this case, since the frame drive base 10 is driven with only its both ends connected to the Y-direction drive unit 11, distortion is likely to occur in the middle portion in the longitudinal direction during frame drive. As a result, the frame feed of the embroidery frame 46 cannot be performed accurately, and therefore, there is a disadvantage that a so-called pattern displacement occurs in the embroidery pattern between the sewing heads 5.
[0005]
OBJECT OF THE INVENTION
The present invention has been proposed in view of the above-described drawbacks inherent in the conventional sewing machine, and has been proposed to suitably solve this problem, and also employs a frame drive mechanism of a type suitable for a small sewing machine. Regardless, an object of the present invention is to provide a sewing machine having a configuration capable of accurately controlling the movement of an embroidery frame even when the number of sewing heads is large.
[0006]
[Means for Solving the Problems]
In order to overcome the above-mentioned problems and achieve the intended object, the present invention provides a long frame driving base disposed in the upper part of a horizontal sewing machine table and extending in the X direction, and the frame driving base in the X direction. A reciprocatingly connected frame body that detachably connects a frame body for stretching and holding a sewing product, and an X-direction drive unit that is provided on the frame drive base and reciprocally drives the link body in the X direction. And a Y-direction drive unit that is disposed at a lower portion of the sewing machine table and that is connected to both ends of the frame drive base to reciprocate the frame drive base in the Y direction, the X-direction drive unit and the Y-direction In the sewing machine in which the frame connected to the connecting body is moved in the X direction and the Y direction on the sewing machine table by driving each of the driving units,
A guide body located above the frame drive base and extending horizontally in the Y direction;
An engagement body which is disposed on the frame drive base and engages with the guide body, and is slidable within a movement range in the Y direction of the frame drive base;
It is connected to an engagement body disposed on the frame drive base, and comprises an auxiliary drive mechanism that drives an intermediate portion in the longitudinal direction of the frame drive base in the Y direction in synchronization with the Y direction drive. To do.
[0007]
[Action]
The auxiliary drive mechanism disposed on the frame drive base also moves and drives the intermediate portion of the frame drive base in the Y direction in synchronization with the Y direction drive, so that the frame drive base is not distorted in the longitudinal direction. Driven by movement.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, the sewing machine according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments. Note that the same members as those already described in the section of the related art are described with the same reference numerals.
[0009]
(About the first embodiment)
1 to 5 show a first embodiment of the sewing machine according to the present invention. FIG. 1 is a plan view showing the sewing machine with a part broken away, and FIG. 2 is a longitudinal side view of the sewing machine shown in FIG. Between the support frames 2 and 2 erected on the upper surfaces of the left and right side portions of the leg 1, the upper frame 3 is fixed in a state of being laid horizontally. Two sewing heads 5, 5 are arranged at a predetermined interval on the front surface of the upper frame 3, and a sewing table 6 is horizontally arranged below the upper frame 3. 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.
[0010]
Below each sewing head 5, cylinder-type hook supports 7 are arranged horizontally. Each of these hook supports 7 is fixedly attached to the upper surface of the lower frame 8 constructed between the lower ends of the support frames 2, 2, and the upper surface thereof is at a height matching the upper surface of the table 6. Is set. A well-known hook (not shown) is disposed inside the front end portion of the hook support 7, and sewing such as embroidery is performed in cooperation with this hook and the sewing needle at the lower end of the needle bar 5a of the sewing machine head 5. It is.
[0011]
On the upper surface of the fixed table 6a, a frame drive base 10 extending in the X direction (left and right direction) is disposed in parallel with the upper frame 3, and both ends thereof are disposed on the lower surface of the fixed table 6a. 30 is connected to the Y-direction drive unit 11 (see FIG. 1). The Y-direction drive unit 11 is a well-known mechanism that mainly includes pulleys 15 and 16 disposed at both front and rear ends of the lower surface of the sewing machine table 6a, and a belt 17 and the like spanning the pulleys 15 and 16. Each drive pulley is connected to a drive motor 14 via a connecting shaft 13. Further, connecting members (not shown) connected to the belts 17 and 17 extend upward from slits 12 and 12 in the Y direction (front-rear direction) formed in the fixed table 6 a, and are attached to both ends of the frame driving base 10. Each is connected. Accordingly, in the frame drive base 10, the belts 17 and 17 move in the required direction by controlling the forward and reverse rotation of the drive motor 14, and move in the Y direction together with the connecting members of the belts 17 and 17. Yes.
[0012]
Inside the frame drive base 10, an X-direction drive unit 47 that forms a part of the main drive mechanism 30 is disposed in order to move the embroidery frame 46 as a frame in the X direction. The X-direction drive unit 47 has a belt 43 spanned between pulleys 40 and 41 rotatably supported at both left and right ends. The pulley 41 is attached to a motor shaft of a drive motor 44 fixed to the frame drive base 10. Are combined. Two connecting bodies 45, 45 are attached to the straight running portion on the front side of the belt 43 at a predetermined interval, and on the sewing machine table 6, the front ends of both the connecting bodies 45, 45 project forward from the frame drive base 10. Are connected to a rectangular embroidery frame 46. The embroidery frame 46 can stretch and hold the raw fabric as it is, and can also attach individual embroidery frames (round frames or the like) corresponding to the respective sewing heads 5. Instead of the embroidery frame 46, the individual embroidery frames can be directly attached to the connecting body 45, respectively. Thus, 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 10 in the Y direction and the X direction drive unit 47 that moves the connecting body 45 in the X direction. It is movable in the Y direction.
[0013]
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 in the X direction (left and right direction) of the sewing machine, and a front end portion of the support bracket 20 is the upper frame 3. While being fixed to the lower surface via the bracket 21, the rear end portion is fixed to the bracket 22 fixed to the rear surface of the lower frame 8. As shown in FIG. 4, a linear rail 23 that functions as a guide body is fixed to the lower surface of the support bracket 20. In addition, a slider 24 with a bearing as an engaging body movably disposed on the linear rail 23 is fixed to the upper surface of the frame driving base 10 via a spacer 25. Therefore, since the slider 24 fixed on the upper surface of the frame driving base 10 always engages and moves with the linear rail 23, the frame driving base 10 is held in a state in which the vertical displacement is completely regulated.
[0014]
Next, the auxiliary drive mechanism 50 disposed on the frame drive base 10 will be described. Two support pins 51, 52 are mounted horizontally on the side surface of the vertical flange portion of the bracket 22 fixed to the lower frame 8 at a predetermined interval in the vertical direction, and the upper support pin 51 has two wires for wiring. Pulleys 53 a and 53 b are supported, and two pulleys 54 a and 54 b are similarly supported on the lower support pin 52. Further, a drive pulley 55 having a spiral groove formed on the outer periphery is fixed to the connecting shaft 13 connected to the drive motor 14 in front of the two lower pulleys 54a and 54b. On the other hand, a pulley 57 is supported in front of the upper two pulleys 53a and 53b by a pin 56 fixed in a suspended state to the lower surface of the upper frame 3. A wire 58 is routed between these pulleys 53a, 53b, 54a, 54b, 55, 57. Each end portion of the wire 58 is connected to the side surface of the spacer 25 by connecting tools 58a and 58b, respectively, and is oriented substantially horizontally toward the rear from one connecting tool 58a as shown in FIG. , 54 a and then wound around the spiral groove of the drive pulley 55, and then turned through the pulleys 54 b and 53 b and forward pulley 57, and the other end is connected to the spacer 25.
[0015]
When the connecting shaft 13 is rotationally driven by the forward / reverse rotation of the drive motor 14 by the mechanism described above, the drive pulley 55 fixed to the drive shaft 55 is rotated, so that the spacer 25 is driven to move in the Y direction via the wire 58. The frame driving base 10 to which the spacer 25 is fixed is moved forward and backward. Here, the diameter of the drive pulley 55 is set so that the drive speed by the Y-direction drive unit 11 and the drive speed by the wire 58 are the same. In addition, either one of the couplers 58a and 28b can adjust the tension of the wire 58.
[0016]
Therefore, in the sewing machine according to the present embodiment, the central portion of the frame driving base 10 is simultaneously moved and driven at the same speed as both ends by the auxiliary driving mechanism 50 driven by the driving motor 14 that moves the frame driving base 10 in the Y direction. Therefore, the frame driving base 10 is driven without causing distortion in the longitudinal direction. The embroidery frame 46 disposed on the frame drive base 10 is accurately moved and driven, and so-called pattern displacement of the embroidery pattern does not occur between the sewing heads 5.
[0017]
(About the 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 configuration different from that of the first embodiment. Since the basic configuration other than the auxiliary drive mechanism 60 is the same as that of the first embodiment, the same members are denoted by the same reference numerals and description thereof is omitted.
[0018]
As shown in FIG. 6, the auxiliary drive mechanism 60 in the sewing machine of the second embodiment has a pin (not shown) arranged in a suspended state on a support portion 22 a extending laterally from the upper portion of the vertical hook portion of the bracket 22. The pulley 61 is supported by this pin. A driving pulley 63 is fixed to a motor shaft of a driving motor 62 fixed downward by a bracket (not shown) on the front surface of the upper frame 3, and an endless timing belt 64 is stretched between these pulleys 61, 63. Yes. The belt 64 is connected to the side surface of the spacer 25 by a fixing tool 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.
[0019]
The drive motor 62 is driven in synchronism with the drive motor 14 of the main drive mechanism 30, and the central portion of the frame drive base 10 is moved and driven at the same speed as both ends. 10 is driven without distortion in its longitudinal direction. Accordingly, the embroidery frame 46 disposed on the frame driving base 10 is accurately moved and driven, and so-called pattern displacement of the embroidery pattern does not occur between the sewing heads 5.
[0020]
In each of the above-described embodiments, the auxiliary drive mechanisms 50 and 60 are disposed in the substantially central portion of the frame drive base 10 to perform auxiliary drive. However, any position other than the central portion and a plurality of locations including the central portion are provided. The auxiliary drive mechanisms 50 and 60 may be installed in the main body. In addition, a linear guide member made up of a linear rail and a slider has been exemplified as the guide body and the engagement body. However, instead of the linear rail, a guide rail having a sliding surface formed on the lower surface is used. The present invention can also be suitably implemented as a slider in which a sliding surface that engages with the sliding surface is formed on the upper surface.
[0021]
【The invention's effect】
As described above, according to the sewing machine according to 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 in synchronization, the frame drive base is controlled to move at both ends and the middle thereof, so that no distortion occurs in the length direction. Accordingly, the frame feed of the embroidery frame mounted on the frame drive base can be performed accurately, and sewing such as embroidery is performed accurately according to the sewing data.
[Brief description of the drawings]
FIG. 1 is a plan view showing a sewing machine according to a first embodiment of the present invention with a part thereof broken away.
FIG. 2 is a longitudinal side view of the sewing machine shown in FIG.
FIG. 3 is a perspective view showing an attached state of the 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 wiring state of the auxiliary drive mechanism.
FIG. 6 is a perspective view showing an attachment state of an auxiliary drive mechanism in a sewing machine according to a second embodiment of the present invention.
FIG. 7 is a plan view showing a sewing machine according to a prior art with a part broken away.
[Explanation of symbols]
6 Sewing Table 10 Frame Drive Base 11 Y Direction Drive Units 14, 62 Drive means (drive motor)
23 Linear rail (guide)
24 Slider (engagement body)
45 Linkage 46 Embroidery frame (frame)
47 X direction drive part 50,60 Auxiliary drive mechanism

Claims (3)

A long frame driving base (10) disposed in the upper part of a horizontal sewing machine table (6) and extending in the X direction, and the frame driving base (10) is disposed in a freely reciprocating manner in the X direction. A link body (45) to which a frame body (46) for stretching and holding a sewing product is detachably connected, and an X which is provided on the frame drive base (10) and reciprocally drives the link body (45) in the X direction. A direction drive unit (47) and a Y arranged at the lower part of the sewing machine table (6) and connected to both ends of the frame drive base (10) to reciprocate the frame drive base (10) in the Y direction. The frame body (46) coupled to the coupling body (45) is driven by driving the X direction driving section (47) and the Y direction driving section (11), respectively. In the sewing machine that is moved in the X direction and the Y direction on the table (6),
A guide body (23) positioned above the frame drive base (10) and extending horizontally in the Y direction;
An engagement body (24) disposed on the frame drive base (10) and engaged with the guide body (23), and slidable within a movement range in the Y direction of the frame drive base (10);
Connected to the engagement body (24) disposed on the frame drive base (10), and in synchronization with the Y-direction drive part (11), drives the intermediate part in the longitudinal direction of the frame drive base (10) in the Y direction. A sewing machine characterized by comprising an auxiliary drive mechanism (50, 60). The sewing machine according to claim 1, wherein the auxiliary drive mechanism (50) uses the drive means (14) in the Y-direction drive unit (11) as a drive source. The sewing machine according to claim 1, wherein the auxiliary drive mechanism (60) uses another drive means (62) driven in synchronization with the drive means (14) in the Y-direction drive section (11) as a drive source.

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