JP3656171B2 - Posture holding mechanism of sewing machine embroidery frame drive - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a posture holding mechanism for holding the posture of an embroidery frame driving body of a sewing machine.
[0002]
[Prior art]
In a sewing machine in which the embroidery frame is held by a holding arm provided in a cantilevered manner on the front side of the frame driving body, a large load is applied to the free end side of the holding arm due to the weight of the embroidery object attached to the embroidery frame. Will join. For this reason, the rear side of the frame driving body comes to float, and as a result, the embroidery frame tends to be in a so-called drooping state. Therefore, a configuration for preventing the forward drooping phenomenon is disclosed in Japanese Patent Laid-Open No. 7-11563. The prevention mechanism includes a rod having a predetermined length, a rod tip holding portion for holding the tip end portion of the rod so as to be horizontally rotatable with respect to the support portion of the embroidery frame, and a rear end portion of the rod horizontally turning with respect to the table. A rod rear end holding portion that is freely and slidably held, and an inclination absorbing means that is provided on at least one of the rod front end holding portion or the rod rear end holding portion and absorbs the vertical inclination of the rod, With this configuration, the embroidery frame is supported by the rod in a suspended state.
[0003]
[Problems to be solved by the invention]
However, since the forward drooping prevention mechanism described above uses a biasing force by a spring as an inclination absorbing means for holding the rod (embroidery frame) in a horizontal position, depending on the position of the embroidery frame, that is, the embroidery frame is separated from the rod rear end holding portion. When it moved away, the rod was tilted, and as a result, it was forced to sag. Therefore, in order to avoid the front drooping state, it is necessary to arrange a number of front droop prevention mechanisms on the table as shown in the above-mentioned publication, but this increases the number of parts of the sewing machine. There was a drawback that the cost increased.
[0004]
OBJECT OF THE INVENTION
The present invention has been proposed in view of the above-mentioned drawbacks inherent in the sag-preventing mechanism of the embroidery frame, and has been proposed to suitably solve this problem, and can reliably prevent the sag phenomenon. It is an object of the present invention to provide a posture holding mechanism for an embroidery frame driving body of a sewing machine having an anti-sagging function that can be configured by the number of parts.
[0005]
[Means for Solving the Problems]
In order to overcome the above-mentioned problems and achieve the intended purpose, the posture holding mechanism of the embroidery frame driving body of the sewing machine according to the present invention includes a holding arm that holds the embroidery frame and is moved at least in the front-rear direction within a horizontal plane. A frame driver,
A guide body that is fixed to a support bracket disposed horizontally above the frame driving body and extends in the front-rear direction;
An engagement body fixed to the upper surface of the frame drive body and movably engaged with the guide body;
In the moving range of the frame driving body, the engaging body is always engaged with the guide body, whereby the vertical displacement of the frame driving body is regulated by the guide body .
In this onset bright in this case, the frame driving unit is possible only movement in the longitudinal direction by the first drive unit, the holding arms, moves in the lateral direction with respect to the frame drive member by the second drive unit Is done .
[0006]
[Action]
When the frame driving body is driven to move, the engaging body fixed to the frame driving body is always engaged with the guide body, so that the upper surface of the frame driving body is always pressed. Therefore, even when a load such as an embroidery frame attached to the holding arm acts, it is possible to effectively prevent the sagging.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, the posture holding mechanism of the embroidery frame driving body of the sewing machine according to the present invention will be described below with reference to the accompanying drawings by giving a preferred embodiment.
(About the first embodiment)
1 to 3 show a first embodiment of the posture holding mechanism of the embroidery frame driving body of the sewing machine according to the present invention, FIG. 1 is a plan view of the sewing machine according to the first embodiment, and FIG. It is a vertical side view of the sewing machine shown in FIG. As shown in FIG. 1 and FIG. 2, the upper frame 3 is fixed in a state of being horizontally laid between the support frames 2 and 2 erected on the upper surfaces of the left and right ends of the leg 1 formed in a frame shape. Has been. 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 is provided at a position lower than the fixed table 6a.
[0008]
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 height of the upper surface coincides with the upper surface of the fixed table 6 a. Set to dimensions. 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.
[0009]
A frame drive body 10 extending in the left-right direction is disposed on the upper surface of the fixed table 6a in parallel with the upper frame 3, and both ends thereof are disposed on the left and right lower surfaces of the fixed table 6a. It is connected to. The first drive mechanism 11 is for moving and driving the frame drive body 10 in the front-rear direction (Y direction). For example, pulleys disposed at both front and rear ends, belts stretched around these pulleys, and the like Is a known mechanism. A connecting member (not shown) connected to each belt extends upward from the front and rear slits 12 and 12 formed in the fixed table 6 a and is connected to the end of the frame driver 10. The drive pulleys of the first drive mechanisms 11 and 11 are fixed to a connecting shaft 13 linked to the first drive motor 14, respectively. The first drive mechanism 11, the connecting shaft 13 and the first drive motor 14 perform the first drive. A portion 18 is formed. Therefore, the frame driving body 10 moves in the front-rear direction of the sewing machine by controlling the forward / reverse rotation of the driving motor 14 in the first driving unit 18.
[0010]
In addition, a total of two pairs of left and right holding arms 16, 16 that hold the embroidery frame 15 are disposed in the front portion of the frame driving body 10 and are positioned so as to correspond to the respective sewing heads 5. These holding arms 16 are connected to a second driving mechanism (not shown) disposed inside the frame driving body 10 so as to be slidable in the left-right direction (X direction) with respect to the frame driving body 10. It is supported. The second drive mechanism is composed of, for example, a pulley and a belt stretched around the pulley, and the drive pulley is connected to a second drive motor 17 attached to the right end of the frame drive body 10, A second drive unit 19 is formed by the two drive mechanism and the second drive motor 17. The holding arms 16 and 16 are slid in the left-right direction with respect to the frame driving body 10 by controlling the forward / reverse rotation of the motor 17 in the second driving unit 19. The embroidery frame 15 is attached and held to the holding arms 16 and 16 by the connecting tool 15a at both ends.
[0011]
Further, a support bracket 20 extending in the front-rear direction at a substantially central portion in the left-right direction of the sewing machine is disposed substantially horizontally above the frame driving body 10, and a front end portion of the support bracket 20 is mounted on the lower surface of the upper frame 3. The rear end is fixed to a bracket 22 fixed to the rear surface of the lower frame 8. As shown in FIG. 3, a linear rail 23 that functions as a guide body is fixed to the lower surface of the support bracket 20. Further, a slider 24 as an engaging body movably disposed on the linear rail 23 is fixed to the upper surface of the frame driving body 10 via a spacer 25.
[0012]
Accordingly, when the frame driving body 10 is moved in the front-rear direction by the first driving unit 18, the slider 24 fixed to the upper surface of the frame driving body 10 moves along the linear rail 23. The linear rail 23 fixed to the bracket 20 holds the displacement in the vertical direction completely regulated. For this reason, even if the embroidery object stretched and held on the embroidery frame 15 has a large weight, the frame drive body 10 is preferably prevented from being tilted and the forward hanging of the holding arm 16 due to this is prevented. The
[0013]
In the illustrated embodiment, the guide body and the engagement body are illustrated as linear guide members including a linear rail and a slider. However, the present invention is not limited thereto, and a guide rail having a sliding surface on the lower surface is used as the guide body. A sliding element in which a sliding surface that engages with the sliding surface of the guide rail is formed on the upper surface can also be suitably implemented as an engaging body.
[0014]
(About the second embodiment)
4 to 6 show a second embodiment of the posture maintaining mechanism of the embroidery frame driving body of the sewing machine according to the present invention, FIG. 4 is a plan view of the sewing machine in the second embodiment, and FIG. It is a vertical side view of a sewing machine. As shown in FIGS. 4 and 5, an upper frame 33 is fixed in a horizontally installed state between support frames 32, 32 erected on the upper surfaces of both left and right end portions of a leg 31 serving as a base. Four sewing heads 35 are disposed at a predetermined interval on the front surface of the upper frame 33, and a sewing table 36 is horizontally disposed below the upper frame 33. The sewing machine table 36 includes a fixed table 36a located at the rear and a movable table 36b located at the front, and the movable table 36b is set at a lower height than the fixed table 36a.
[0015]
Below each of the sewing heads 35, a cylinder-type hook support 37 is disposed horizontally. Each hook support 37 is fixedly attached to the upper surface of a lower frame 38 constructed between the legs 31 and 31, and the upper surface thereof is set to a height dimension that coincides with the upper surface of the fixed table 36a. ing. A well-known hook (not shown) is disposed inside the front end portion of the hook support 37, and sewing of embroidery or the like is performed in cooperation with this hook and the sewing needle at the lower end of the needle bar 35a of the sewing machine head 35. Is to be performed.
[0016]
A frame driving body 40 extending in the left-right direction is disposed on the upper surface of the fixed table 36a in parallel with the upper frame 33, and both ends of the frame driving body 40 are disposed on the lower surface of the fixed table 36a at a predetermined interval. The three first drive mechanisms 41 are connected. These first drive mechanisms 41 are for moving and driving the frame drive body 40 in the front-rear direction (Y direction). The first drive mechanism 41 mainly includes pulleys disposed at both front and rear ends, belts stretched around each pulley, and the like. This is a well-known mechanism for making a component. Then, connecting members (not shown) connected to the respective belts extend upward from the respective slits 42 in the front-rear direction formed in the fixed table 36 a and extend in the left-right direction formed on the lower surface of the frame driver 40. It fits into an existing fitting groove (not shown). The drive pulley of each first drive mechanism 41 is fixed to a connecting shaft 43 connected to the first drive motor 44. The first drive mechanism 41, the connecting shaft 43, and the first drive motor 44 serve as a first drive unit. 48 is formed. Therefore, the frame driving body 40 is moved in the front-rear direction of the sewing machine by controlling forward / reverse rotation of the driving motor 44 in the first driving unit 48. As described above, since the connecting member is fitted in the fitting groove extending in the left-right direction, the frame driving body 40 can be moved in the left-right direction. The movable body 60 connected to the second drive mechanism 61 of the second drive unit 49 that is a drive source in the X direction is also moved in the left-right direction.
[0017]
The movable body 60 is placed on the upper surface of the fixed table 36a with both front and rear end portions connected to the second drive mechanism 61 disposed on the lower surface of the fixed table 36a. As described above, the second drive mechanism 61 is for moving and driving the frame drive body 40 in the left-right direction (X direction). The pulleys are arranged at both left and right ends, and are stretched around these pulleys. It is a well-known mechanism with a main belt as a main component. Then, connecting members (not shown) connected to the respective belts extend upward through left and right slits 62 formed in the fixed table 36 a and are connected to both ends of the lower surface of the moving body 60. Each drive pulley of the second drive mechanism 61 is fixed to a connecting shaft 64 connected to the second drive motor 65, and the second drive unit 49 is connected by the second drive mechanism 61, the connecting shaft 64 and the second drive motor 65. Forming. The moving body 60 moves in the left-right direction of the sewing machine by controlling forward / reverse rotation of the drive motor 65 in the second drive 49. Since the right end of the frame driving body 40 is connected to the moving body 60 via the connecting body 63, the frame driving body 40 moves integrally with the moving body 60 in the left-right direction (X direction), and the front-rear direction (Y (Direction) can be moved independently. That is, the frame driving body 40 is arranged to be movable in the front-rear direction and the left-right direction by the first drive mechanism 41 and the second drive mechanism 61.
[0018]
A total of four pairs of left and right holding arms 46 and 46 for holding the embroidery frame 45 are disposed in the front portion of the frame driving body 40 and are positioned so as to correspond to the respective sewing heads 35. Each holding arm 46 is attached to the frame driver 40 so that the position thereof can be adjusted so as to correspond to the size of the embroidery frame 45 to be attached. The embroidery frame 45 is attached and held by a pair of holding arms 46 and 46 by means of a connector 45a at both ends thereof.
[0019]
Further, above the frame driving body 40, support brackets 50 extending in the front-rear direction are disposed substantially horizontally at substantially intermediate positions (two locations) of the adjacent first driving mechanisms 41, 41, respectively. A front end portion is fixed to the lower surface of the upper frame 33, and a rear end portion is fixed to a bracket 52 fixed to the rear surface of the lower frame 38. As shown in FIG. 6, a linear rail 53 as a guide body is fixed to the lower surface of each support bracket 50, and a slider 54 as an engaging body is movably disposed on the linear rail 53. Has been. On the other hand, on the upper surface of the frame driving body 40, linear rails 55 are disposed and fixed at right angles with the linear rails 53 at appropriate two locations, and spacers 57 are attached to the linear rails 55 with respect to the slider 54. A slider 56 coupled thereto is movably disposed.
[0020]
Therefore, when the frame driving body 40 is driven by the first driving unit 48 and moves in the front-rear direction, the slider 54 moves along the linear rail 53 accordingly. Further, when the frame driving body 40 is driven by the second driving portion 49 and moves in the left-right direction, the slider 56 moves along the linear rail 55 accordingly. At this time, the frame driving body 40 is held in a state where displacement in the vertical direction is completely restricted by the linear rail 53 fixed to the support bracket 50. For this reason, even if the embroidery frame stretched and held on the embroidery frame 45 has a large weight, the frame driving body 40 is preferably prevented from being tilted and the holding arm 46 is not caused to hang forward.
[0021]
In the present embodiment, the guide body and the engaging body are illustrated as linear guide members made up of linear rails and sliders. However, the guide body and the engaging body are not limited to these, and a guide rail having a sliding surface on the lower surface is used as the guide body. In addition, a horizontally long sliding body as an engaging body formed on the upper surface with a sliding surface that engages with the sliding surface of the guide rail may be attached to the frame driving body 40 via an appropriate spacer.
[0022]
In each embodiment, the first drive mechanisms 11 and 41 that move the frame drive bodies 10 and 40 in the front-rear direction and the second drive mechanism 61 that moves the frame drive body 40 in the left-right direction are respectively connected to the pulley and the pulley. Although a mechanism using a belt that is stretched and hung is illustrated, the present invention is not limited to this. For example, a mechanism in which movement control is performed by a double-acting actuator, a screw that is rotationally driven by a motor, and a nut that is screwed to the screw are used as a frame driver It is good also as a form which attaches to 10,40 and carries out movement control.
[0023]
【The invention's effect】
As described above, according to the posture holding mechanism of the embroidery frame driving body of the sewing machine according to the present invention, the inclination of the frame driving body due to the load of the embroidery frame or the like attached to the holding arm and the forward drooping of the holding arm resulting therefrom. Can be suitably and reliably prevented, and the number of parts can be reduced with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a plan view of a sewing machine according to a first embodiment of the present invention.
FIG. 2 is a longitudinal side view of the sewing machine shown in FIG.
FIG. 3 is an exploded perspective view showing a guide body and an engagement body.
FIG. 4 is a plan view of a sewing machine according to a second embodiment of the present invention.
FIG. 5 is a longitudinal side view of the sewing machine shown in FIG. 4;
FIG. 6 is an exploded perspective view showing a guide body and an engagement body.
[Explanation of symbols]
10, 40 Frame driving body 15, 45 Embroidery frame 16, 46 Holding arm 18, 48 First driving section 19, 49 Second driving section 23, 53 Linear rail (guide body)
24, 54 Slider (engagement body)

Claims (3)

A holding arm (16) for holding the embroidery frame (15), and a frame driving body (10) that is moved at least in the front-rear direction in a horizontal plane;
A guide body (23) fixed in a support bracket (20) disposed horizontally above the frame driving body (10) and extending in the front-rear direction;
It is fixed to the upper surface of the frame driving body (10), and includes an engaging body (24) that is movably engaged with the guide body (23),
By always engaging the engagement body (24) with the guide body (23) within the range of movement of the frame drive body (10), the vertical displacement of the frame drive body (10) is reduced to the guide body ( 23) A posture holding mechanism of an embroidery frame driving body for a sewing machine, characterized in that the sewing machine is configured to be regulated by 23) .   The frame driver (10) can only be moved in the front-rear direction by the first driver (18), and the holding arm (16) can be moved by the second driver (19). The posture holding mechanism of the embroidery frame driving body of the sewing machine according to claim 1, wherein the posture holding mechanism is moved in the left-right direction with respect to the sewing machine.   The posture holding mechanism of the embroidery frame driving body of the sewing machine according to claim 1, wherein the guide body is a linear rail (23), and the engaging body is a slider (24) engaged with the linear rail (23).

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