JP2568615Y2 - Finger protection device for multi-needle sewing machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a finger protection device in a multi-needle sewing machine such as an embroidery sewing machine.

[0002]

2. Description of the Related Art Conventionally, as a structure of a finger protection device of this kind, as shown in Japanese Utility Model Publication No. 64-5594, for example, in a single-needle sewing machine for home use or industry, an operator is required to perform Move the finger guard away from the needle and the working position to prevent the hands and fingers from inadvertently approaching the lower end of the needle bar and the sewing needle attached to the needle and the hands and fingers. The posture can be manually changed to the non-operation position in which the rotation is upward.

[0003]

However, in the finger protection device having the above-described structure, the base end of the finger guard is rotatably mounted directly on the slide case or the sewing machine head. It is much larger than that. On the other hand, in a multi-needle sewing machine, since the arrangement interval of the needle bars arranged side by side is narrow, the above-mentioned finger protection device is moved left and right with respect to the sewing machine head by supporting the sewing machine head and a plurality of needle bars vertically. It was virtually impossible to attach it to a slide case that could be made. Also, manually changing the posture of the finger protection device for each needle bar position is inefficient when performing an operation such as threading a large number of sewing needles.

An object of the present invention is to solve this problem and to provide a hand protection device for a multi-needle sewing machine that is compact and has good workability.

[0005]

In order to achieve the above-mentioned object, a finger protection device for a multi-needle sewing machine according to the present invention comprises a plurality of needles mounted on a slide case slidably mounted on a front surface of a sewing head. The rod is mounted on a multi-needle sewing machine configured to be vertically movable at regular intervals and configured to vertically drive one needle bar selected by moving the slide case left and right, The slide case is provided with a horizontal support shaft that crosses the front side or the rear surface side of the plurality of needle bars, and the horizontal support shaft has a finger guard rotatably supported at a base end on each needle bar. Correspondingly, each of the finger guards is spring-biased so as to have an action posture located near the sewing needle attached to the lower end of each needle bar, while a control piece attached to the sewing machine head is attached to the slide case. Supports the needle bar selected by moving left and right That it is brought into contact with the projecting portion of the fin guard guard, which is constituted so as to dynamic Nigemawa the fins guard guards inoperative position away from the corresponding needle.

[0006]

Next, an embodiment of the present invention will be described. FIG. 1 is a plan view of an embroidery multi-head, multi-needle sewing machine in which a plurality of sewing arms 1 are arranged in parallel with a table 2. A common horizontal shaft 4 penetrating in a lateral direction through a hollow cylindrical bracket 3 detachably provided at the rear end of each sewing machine arm 1 is rotationally driven by one drive motor 5, and transmitted via a transmission mechanism in each bracket 3. Power is transmitted to the upper shafts 6 arranged in the respective sewing machine arms 1.

On the table 2, a cloth presser frame (not shown) for holding a cloth (not shown) to be sewn is arranged, and the cloth presser frame moves with the X motor in the X direction. Mechanism and Y
It is intermittently moved in a predetermined XY direction by a motor and a Y-direction moving mechanism. Further, control means (not shown) controls the intermittent operation of the X motor and the Y motor in the forward and reverse rotations based on the embroidery pattern.

In the base (rear) of each sewing machine arm 1, an upper shaft 6 (see FIG. 3) via a pair of bevel gears and a vertical axis.
Is transmitted to a lower shaft (not shown) located below the bed 2a to rotate a shuttle having a well-known structure (not shown). A rectangular frame-shaped slide case 7 as viewed from the front is supported movably on the front surface of a hollow and open front sewing machine head 1a which is the tip of each sewing machine arm 1, and a lower guide portion 7a of the slide case 7 is provided. And the upper guide portion 7b formed at the middle position in the vertical direction, the lower portion of the needle bar 9 (12 in the embodiment) and the middle portion in the vertical direction are supported slidably in the vertical direction. A sewing needle 8 is attached to the lower end of each needle bar 9 (see FIG. 2).

Next, referring to FIGS. 2 and 3, a drive mechanism for vertically driving one needle bar 9 selected by the lateral movement of the slide case 7 and a balance for vertically driving the balance 10 will be described. The driving mechanism will be described. Each needle bar 9
The needle bar 9 is set at an ascending position by fitting a coil spring 20 between the needle bar holder 19 fixed to the lower case 7 and the lower guide portion 7a of the slide case 7.
Balance driving cam 12 attached to the tip of the upper shaft 6 inside
A connecting rod 21 is eccentrically attached to the tip of the. And the connecting rod 21
The needle bar connector 23, which is vertically movable and rotatably mounted on the guide shaft 22 via the shaft, is driven to move up and down in accordance with the rotation of the upper shaft 6. Pin 2 of the needle bar clamp 19 fixed to the needle bar 9 at the sewing position
5 is selectively engaged, and only the needle bar 9 at the corresponding position is driven up and down in the sewing state.

A balance support frame 40, which is attached to the upper back surface of the slide case 7 and can be moved laterally as a unit, is arranged in a horizontal line corresponding to the needle bars 9 in a substantially rectangular frame shape in a front view. The scales 10 are supported on the horizontal axis 11 so as to be vertically rotatable, and each of the scales 10 is biased by a biasing spring 18 whose upper end is locked by a horizontally long support bracket 41 attached to the front surface of the scale support frame 40. It is set to the upward position. As shown in FIG. 3, a driven cam 13 is slidably fitted with a cam groove 12a of a balance driving cam 12 attached to the tip of the upper shaft 6 in the sewing machine head 1a. The mounted swing arm 14 is fixed so as to rotate integrally with the rotation shaft 15. Then, the rotation of the upper shaft 6 causes the rotation shaft 15 to reciprocate by an appropriate angle. The fan-shaped drive gear 16 fixed to the rotating shaft 15 is
Balance 1 at sewing position by lateral movement of slide case 7
The gear selectively meshes with a fan-shaped driven gear 17 provided at the base of the zero, and only the balance 10 swings up and down.

Further, the balance supporting frame 40 is in contact with a base stopper on the front surface of the driven gear 17 of each of the balances 10 to restrict the balance 10 from further turning upward. Adjusting means are provided. As shown in FIG. 2, the position adjusting means includes a base stopper portion on the front surface of each driven gear 17 in a state where the tip of each balance 10 is rotated upward at the lower horizontal frame edge 40a of the balance support frame 40. The adjusting screw 43 is screwed at a fixed interval to a position where the balance 10 can be contacted, and by operating each adjusting screw 43 from the front side of the balance support frame 40, the upward rotation position of each balance 10 can be adjusted. It is configured to be.

As shown in FIG. 2, a vertical hole 26 is formed in the cover plate 27 which covers the front surface of the slide case 7, and the tip of each balance 10 projects from the vertical hole 26. Is configured. Further, although not shown, on the front surface of the thread tension table which can be moved laterally integrally with the slide case 7, an upper thread F of a different color supplied from the supply table is provided.
, A rotating body for detecting a thread break, a thread tensioner for applying tension to the upper thread F, and the like are provided.
The upper thread F supplied from the thread tension table side in this manner is inserted through the sewing needle 8 attached to the lower end of the predetermined needle bar 9 via the balance 10.

Next, the structure of the finger protection device of the present invention will be described with reference to FIGS. A pair of brackets 44a, 44 are provided on both left and right sides of the slide case 7, respectively.
b is projected downward, and this pair of brackets 4
Both ends of the horizontal support shaft 46 are supported by 4a and 44b. As shown in FIG. 5, the horizontal support shaft 46 is disposed so as to be located in front of all the needle bars 9. The horizontal support shaft 46 is provided with a finger guard 45 having a coil-shaped base end rotatably supported at nine locations of each needle bar, and a torsion coil spring 47 for urging. ing. Therefore, in the embodiment, the twelve finger guards 45 and the torsion coil springs 47 are arranged at regular intervals as shown in FIG. As shown in FIG. 5, each finger guard 45 formed of a bar is provided so that a horizontal guard portion 45a at the lower end thereof approaches the lower end of the sewing needle 8 in each of the needle bars 9 and the coil-shaped base member 45a. A protruding portion 45b is formed so as to extend from the end toward the lower end of the sewing head 1a.

As shown in FIGS. 4 and 5, between each of the finger guards 45 and the horizontal support shaft 46, a coil portion 47a of each torsion coil spring 47 is rotatable about the horizontal support shaft 46. One end of each of the torsion coil springs 47 is engaged with the lower end of the front surface of the slide case 7 (the front surface of the cover plate 27 in the embodiment), and the other end is connected to each finger guard 45.
And the horizontal guard portions 45a of the finger guards 45 are brought into an operating posture approaching the lower end of the sewing needle 8 by the urging force of the torsion coil spring 47. Have been.

The lower end of the sewing head 1a is
As shown in FIG. 7, only one tongue-shaped control piece 48 is provided corresponding to the position of the selected needle bar 9. With this configuration, when the slide case 7 moves laterally, the tip of the protrusion 45b of the finger guard 45 located on the side corresponding to the selected needle bar 9 is moved to the control piece 4
6 (see FIGS. 6 and 7), and the horizontal guard portion 45a at the lower end of the finger guard 45 moves away from the lower end of the sewing needle 8 against the biasing force of the torsion coil spring 47. It turns to escape so that The lateral movement of the slide case 7 causes the control piece 48 to move.
When the contact between the finger guard 45 and the projection 45b is released, the finger guard 45 is biased by the torsion coil spring 47 so that the horizontal guard portion 45a at the lower end thereof approaches the lower end of the sewing needle 8 in the original operation posture. It will be automatically restored.

At the lower end of each sewing head 1a, as shown in FIGS. 4 and 5, one cloth presser 49 is provided corresponding to the position of the selected needle bar 9 (shown in FIG. 4). Z)
It is mounted so that it can be moved up and down by moving up and down.
With this configuration, when the slide case 7 is laterally moved during the sewing operation, only the finger guard 45 corresponding to the selected needle bar 9 is in the non-operation position so as to be away from the eight sewing needles. In addition, the horizontal guard portion 45 of the finger guard 45 is automatically
Since a is located in the vicinity of the lower end of the sewing needle 8, the fingers of the worker cannot approach, so that the safety of the worker can be ensured.

In the above embodiment, the horizontal support shaft 46 is arranged on the front side of the needle bar 9, but it is needless to say that the horizontal support shaft 46 may be arranged on the rear side of the needle bar 9. Absent. Needless to say, the present invention can also be applied to a single-head type multi-needle sewing machine.

[0018]

As described in detail above, according to the finger protection device for the multi-needle sewing machine of the present invention, a plurality of needles are mounted on a slide case slidably mounted on the front surface of the sewing machine head. Attach the rod at regular intervals so that it can move up and down,
Used for a multi-needle sewing machine configured to vertically drive one needle bar selected by moving the slide case left and right, wherein the slide case has a front side of the plurality of needle bars. Alternatively, a horizontal support shaft that crosses the rear surface side is provided, and a finger guard whose base end is rotatably supported is provided for each needle bar on the horizontal support shaft, and each finger guard is attached to each needle. Since the spring is configured to be biased so as to be in the action posture located near the sewing needle attached to the lower end of the rod, a large number of finger guards can be arranged on one horizontal support shaft. Is simple and compact.

Further, the control piece attached to the sewing machine head is brought into contact with the projection of the finger guard corresponding to the needle bar selected by moving the slide case to the left and right, so that the finger guard corresponds to the finger guard. Because it is configured to rotate to escape to the non-operative position away from the sewing needle,
The finger guard can be automatically retracted from the lower end of the sewing needle according to the selection of the needle bar due to the lateral movement of the slide case, and sewing work can be performed more quickly than manual retraction, improving workability. It has the effect of being able to make it work.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a multi-head, multi-needle sewing machine.

FIG. 2 is a partially cut-away side sectional view of a main part.

FIG. 3 is a perspective view of a drive mechanism of a needle bar and a balance.

FIG. 4 is a front view of the slide case with a cover plate removed.

FIG. 5 is a side sectional view taken along line VV of FIG. 4;

FIG. 6 is a side view showing a state in which the finger guard is turned to a non-operating posture.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

[Explanation of symbols]

 Reference Signs List 1 sewing machine arm 1a sewing machine head 7 slide case 8 sewing needle 9 needle bar 44 bracket 45 finger guard 45a horizontal guard 46 horizontal support shaft 47 torsion coil spring 48 control piece 49 cloth holder

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of needle bars are vertically movably mounted on a slide case mounted on a front surface of a sewing head so as to be slidable left and right at predetermined intervals, and selected by moving the slide case left and right. In the multi-needle sewing machine configured to vertically drive one needle bar, the slide case is provided with a horizontal support shaft that crosses the front side or the rear surface side of the plurality of needle bars, and the horizontal support shaft is provided with the horizontal support shaft. Is provided with a finger guard rotatably supported at the base end corresponding to each needle bar, and has an action posture in which each finger guard is located near a sewing needle attached to the lower end of each needle bar. While biasing the spring as described above, the control piece attached to the sewing machine head is brought into contact with the protrusion of the finger guard corresponding to the needle bar selected by the lateral movement of the slide case, and the finger guard is moved. Non-working position away from the corresponding sewing needle A finger protection device for a multi-needle sewing machine, characterized in that the finger protection device is configured to be pivoted to escape.