JP2009268725A - Cover opening/closing device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cover opening/closing device of a sewing machine which safely and readily opens an opening/closing cover without touching a looper thread. <P>SOLUTION: An opening space portion of a sewing machine bed 5 formed around a looper is mounted with the opening/closing cover 10 configured to openably and closably turn around a hinge. An openably urging spring member 20 for openably urging the opening/closing cover 10 and a closably locking mechanism 21 for holding the opening/closing cover 10 at a closing position against the openably urging force of the spring member 20, are provided between the free end side 10B of the opening/closing cover 10 and the sewing machine bed 5 side. The closably locking mechanism 21 includes a locking hole 26 provided on the free end side of the opening/closing cover 10 and an operation lever 27 having a hook portion 27a provided on the sewing machine bed 5 side to engage with/disengage from the locking hole 26. The operation lever 27 is provided so as to swing around a pivot, and has one end provided with the hook portion and the other end provided with a pressing button 27b. The operation lever 27 includes a turnably urging spring member 31. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cover opening / closing device for a sewing machine, and more specifically, an opening / closing cover for opening / closing an opening space portion of a sewing machine bed formed around a looper can be safely and safely without being caught by a looper thread passed through the looper. The present invention relates to a cover opening and closing device for a sewing machine that can be easily opened.

  As this type of sewing machine cover opening and closing device, for example, there is one described in Patent Document 1. In this case, the opening space on the front side of the sewing machine bed formed around the looper is opened and closed with an opening / closing cover (referred to as “cross plate” in Patent Document 1). The open / close cover is attached to the sewing machine bed so as to be able to open and close around the support shaft, and a leaf spring fixed to the inner bottom surface of the free end opposite to the support shaft of the open / close cover is installed on the machine bed side. The closed state of the opening / closing cover is maintained by engaging the locking pin, and the opening / closing cover is opened by pushing the finger hook at the tip of the leaf spring to engage the locking pin of the leaf spring. The opening space portion can be opened by releasing the opening / closing cover about the support shaft.

JP-A-5-337280

  However, in the above conventional sewing machine cover opening and closing device, when opening the opening and closing cover when passing the looper thread through the looper, etc., the hand must be inserted into the opening and closing cover from the front side of the opening and closing cover and the finger hook part of the leaf spring must be pressed. However, at this time, the hand touches or hooks the looper yarn that has already been passed through another looper.

  The present invention has been made to solve the above-described problems, and the object of the present invention is to make the opening / closing cover open operation outside the opening / closing cover and automatically enabling the opening / closing cover to be semi-opened. It is an object of the present invention to provide a sewing machine cover opening / closing device that can open an opening / closing cover safely and easily without touching a looper thread with a hand.

  The cover opening and closing device for a sewing machine according to the present invention will be described with reference to the reference numerals attached to FIGS. 1 to 13 as described in claim 1. The opening space S in which the looper 6 is accommodated in the sewing machine bed 5. The opening / closing cover 10 that opens and closes the opening space S is attached to the sewing machine bed 5 so as to be capable of opening and closing rotation between a position where the opening space S is closed and an opening position about the hinge 18 as a rotation center. In the cover opening / closing device, an opening biasing spring member 20 that always opens and biases the opening / closing cover 10 between the free end side 10B opposite to the hinge 18 of the opening / closing cover 10 and the machine bed 5 side, and the spring member 20 is provided with a closing lock mechanism 21 that holds the opening / closing cover 10 in a closed position against an opening urging force of the opening 20, and the closing locking mechanism 21 is provided on the free end side 10 </ b> B of the opening / closing cover 10 or the sewing machine bed 5. And a control lever 27 having a hook portion 27a which is provided on the other side and can be engaged with and disengaged from the lock hole 26. The control lever 27 swings around the pivot 30. The hook portion 27a is provided at one end as an action point, and the pressing button 27b is provided at the other end as a power point so as to be exposed to the outside on the free end side 10B of the opening / closing cover 10 or the machine bed 5 side. The operating lever 27 is characterized in that it is provided with a rotation biasing spring member 31 that always biases the operation lever 27 so that the hook portion 27a engages with the lock hole 26. .

  In the sewing machine cover opening / closing device having the above-described configuration, when the opening / closing cover 10 is opened, the pressing button 27b of the operation lever 27 is pressed, and this pressing button 27b is provided on the free end side 10B of the opening / closing cover 10 or the sewing machine bed 5 side. Since it is exposed to the outside, it is possible to avoid the hand operating the pressing button 27b from touching the looper thread T passed through the looper 6 in the opening / closing cover 10 at this time. Further, when the operating lever 27 is swung by the pressing operation of the pressing button 27b and the hook portion 27a is detached from the lock hole 26, the opening / closing cover 10 is automatically moved by the biasing force of the opening biasing spring member 20. Since it is half-opened and separated from the looper 6, it is possible to prevent the hand from touching the looper thread T passed through the looper 6 even when the opening / closing cover 10 is fully opened by placing a hand on the opening / closing cover 10.

  According to a first aspect of the present invention, the sewing machine cover opening / closing device absorbs and reduces vibrations of the opening / closing cover 10 between the free end side 10B of the opening / closing cover 10 and the sewing machine bed 5 side. Anti-vibration means 32 provided with rubbers 33 and 35 can be provided. According to this, the vibration of the open / close cover 10 can be reliably absorbed and relaxed.

  According to the present invention, the opening / closing cover can be opened outside the opening / closing cover and the opening / closing cover can be automatically opened halfway, so that when opening the opening / closing cover, the hand touches the looper thread to tear off the looper thread. It is advantageous that the opening / closing cover can be opened safely and easily without fear.

  A preferred embodiment of a cover opening and closing device for a sewing machine according to the present invention will be described with reference to the drawings. 1 shows an external perspective view of a double chain stitch sewing machine to which the present invention is applied, in a closed state of the opening / closing cover, FIG. 2 shows an external perspective view of the sewing machine in a half-open state of the opening / closing cover, and FIG. 4 is an exploded perspective view of the cover opening / closing device, FIG. 5 is a perspective view showing the free end side of the opening / closing cover in a closed state, and FIG. 6 shows the free end side of the opening / closing cover in a half-open state. 7 is a cross-sectional view of a vibration isolating portion of the opening / closing cover, FIG. 8 is a plan view showing the free end side of the opening / closing cover in a closed state, and FIG. 9 is a plan view showing the free end side of the opening / closing cover in a half-open state. 10 is a perspective view showing the free end side of the opening / closing cover in a closed state, FIG. 11 is a perspective view showing the free end side of the opening / closing cover in a half-open state, and FIG. 12 is a cross-sectional view of the closing lock mechanism of the cover opening / closing device. (A) shows the locked state, (b) shows the unlocked state. Re respectively shown, FIG. 13 is a cross-sectional view of a closed locking mechanism of the cover opening and closing device, which is (a) a locking state immediately before the (b) is in the middle of the lock state.

  As shown in FIG. 1, a double chain stitch sewing machine to which the present invention is applied is a needle bar (not shown) supported at the tip of a sewing machine arm 1 so as to be capable of reciprocating in the vertical direction via upper and lower bearings (not shown). A large number of needles 3 are attached to the lower end of (not shown) via a needle stock 2. A sewing pulley 4 is provided at the right outside position of the lower base end of the sewing machine arm 1, and a sewing bed 5 is extended to the left side in a state parallel to the sewing machine arm 1 at the lower base end of the sewing machine arm 1. Has been. As shown in FIG. 3, an opening space S that opens the upper surface and the front and rear surfaces is formed at the tip of the sewing machine bed 5. The opening space S accommodates parts constituting the sewing such as a looper 6 and a cloth feed mechanism (not shown) which will be described later.

  The rear surface of the opening space S is covered with a rear cover (not shown), the rear half of the open upper surface is covered with the upper cover 7, and the front half of the open upper surface and the open front surface are covered with the opening / closing cover 10 as an object of the present invention. . The upper cover 7 is provided with a needle plate 11 and the like.

  As shown in FIGS. 2 and 3, a looper drive shaft 12 is supported in the opening space S of the sewing machine bed 5 so as to be reciprocatingly rotatable in a direction orthogonal to the fabric feed direction (rear direction) Y. 12, the base end portions 6 </ b> A of a large number of loopers 6 corresponding to the large number of needles 3 are attached via a looper base 13, and the reciprocating driving rotation of the looper driving shaft 12 is synchronized with the vertical reciprocating movement of the needles 3. Accordingly, the looper 6 swings back and forth within a predetermined swing range in the fabric feed direction Y within the opening space S with the tip 6B side having the looper threading hole 14 positioned higher than the base end 6A. It is configured to be. The looper 6 that is swung back and forth and the spreader shaft 15 that reciprocates in the left-right direction perpendicular to the material feeding direction Y in synchronization with the up-and-down reciprocating movement of the needle 3 are hooked on the looper thread T of the looper 6. A predetermined double chain stitch is performed with the spreader 16 approaching the needle thread direction.

  Next, an opening / closing device for the opening / closing cover 10 will be described. As shown in FIGS. 1 and 4 to 7, the fixed side end (left end) 10 </ b> A of the opening / closing cover 10 is attached to a hinge 18 fixed to the front side wall surface 5 </ b> S of the sewing machine bed 5 with a bolt 17 or the like on the front outside. The opening / closing cover 10 is pivotally connected via the hinge shaft 19, whereby the opening / closing cover 10 opens at a position (see FIGS. 1 and 5) that closes the front half of the opening upper surface and the opening front surface of the opening space S around the hinge shaft 19. It is attached so as to be capable of opening and closing in the front-rear direction over the position (see FIGS. 2 and 6).

  As shown in FIGS. 4, 5, and 12 (a), an opening / closing cover is provided between the free end side (right end side) 10 </ b> B opposite to the hinge 18 of the opening / closing cover 10 and the upper cover 7 on the sewing machine bed 5 side. An opening urging spring member 20 for always opening and urging 10 and a closing lock mechanism 21 for holding the opening / closing cover 10 in a closed position against the opening urging force by the spring member 20 are provided. The opening biasing spring member 20 is formed in a V shape, and an arm portion 20a at one end thereof is fixed to the opening / closing cover 10 with a bolt 22 or the like, while an arm portion 20b at the other end is fixed to the front end of the upper cover 7 on the sewing machine bed 5 side. The opening / closing cover 10 is always urged to rotate in the opening direction (forward direction) by the pressing contact action on the spring receiving wall portion 23 provided on the surface.

  As shown in FIGS. 4, 5, and 12 (a), the closing lock mechanism 21 includes a lock hole 26 that opens in a lock plate 25 that is fixed to the lower surface of the free end side 10 </ b> B of the opening / closing cover 10 with a bolt 24 or the like. And a hook-type operation lever 27 provided on the upper cover 7 on the sewing machine bed 5 side and having a hook portion 27a that can be engaged and disengaged with respect to the lock hole 26. The operation lever 27 is pivotally mounted on a lever support base 29 fixed to the upper cover 7 on the sewing machine bed 5 side with a bolt 28 or the like so as to be swingable up and down about a pivot 30. The hook portion 27a is provided at the front end portion serving as the operating point of the operation lever 27, and the pressing button 27b is provided at the rear end portion serving as the power point so as to be exposed to the outside of the upper cover 7 on the sewing machine bed 5 side. The pressing button 27b is provided so as to slightly protrude from the upper surface of the upper cover 7 as shown in FIG. 12A or to be flush with the upper surface of the upper cover 7 as shown in FIG. A pivot biasing spring member 31 made of a torsion coil spring or the like is wound around the pivot 30 of the operating lever 27, and the operating lever 27 is always engaged with the lock hole 26 by the elastic force of the spring member 31. It is urged to rotate about the pivot 30 in the direction of alignment.

  As shown in FIGS. 4 and 7, a vibration isolating means for absorbing and mitigating vibration of the opening / closing cover 10 is provided between the free end side 10B of the opening / closing cover 10 and the front end surface of the upper cover 7 on the sewing machine bed 5 side. 32 is provided side by side with the opening biasing spring member 20. The anti-vibration means 32 includes an anti-vibration screw 34 provided with an anti-vibration rubber 33 for absorbing and relaxing mainly the longitudinal vibration of the opening / closing cover 10, and an anti-vibration rubber 35 for absorbing and reducing mainly the vertical vibration of the opening / closing cover 10. An anti-vibration rubber bracket 36 is provided. The anti-vibration screw 34 has a base end portion fastened and fixed to the opening / closing cover 10 side with a nut 37 or the like, and is provided with an anti-vibration rubber 33 at the tip. It is trying to contact. The anti-vibration rubber bracket 36 is fixed to the opening / closing cover 10 with bolts 38 or the like and is provided with an anti-vibration rubber 35 at the tip. When the opening / closing cover 10 is closed, the anti-vibration rubber 35 is provided on the upper cover 7 on the sewing machine bed 5 side. The spring receiving wall 23 is in contact with the lower surface of the spring receiving wall 23.

Next, the operation of the cover opening / closing device will be described.
In the state where the opening / closing cover 10 is closed, as shown in FIGS. 8 and 10, the arm portion 20 b of the opening biasing spring member 20 presses and contacts the spring receiving wall portion 23 on the sewing machine bed 5 side, thereby opening and closing the cover. 10 is urged in the opening direction, but as shown in FIG. 12A, the hook portion 27a of the operation lever 27 of the closing lock mechanism 21 is engaged with the lock hole 26, thereby opening urging. The opening / closing cover 10 is locked and held in the closed position against the opening biasing force of the spring member 20.

  In order to open the opening / closing cover 10 when the looper thread is passed through the looper 6 and the like, as shown in FIG. 12 (b), the pressing button 27b is pressed to operate the operating lever 27 with the elasticity of the rotation biasing spring member 31. The hook portion 27 a is detached from the lock hole 26 by swinging around the pivot 30 against the above. Then, as shown in FIGS. 9 and 11, the opening / closing cover 10 is automatically half-opened by a certain angle around the hinge 18 by the opening biasing action by the opening biasing spring member 20. After the half-opening, the opening / closing cover 10 is pulled to the front side by hand to be fully opened.

  When the pressing button 27b is pressed as described above, the pressing button 27b is exposed to the outside on the sewing machine bed 5 side. At this time, the hand operating the pressing button 27b passes through the looper 6 in the opening / closing cover 10. It is possible to avoid touching the looper yarn T. When the opening / closing cover 10 is automatically half-opened by the urging force of the opening urging spring member 20, the opening / closing cover 10 is separated from the looper 6. Thereafter, the opening / closing cover 10 is fully opened by placing a hand on the opening / closing cover 10. Sometimes the hand can be prevented from touching the looper thread T passed through the looper 6. Therefore, when opening the opening / closing cover 10, the opening / closing cover 10 can be opened safely and easily without fear of tearing the looper thread T by touching the looper thread T with a hand.

  To close the open / close cover 10, when the free end of the open open / close cover 10 is pushed back, the rear end portion of the lock plate 25 is provided on the hook portion 27 a of the operation lever 27 as shown in FIG. When the opening / closing cover 10 is further pushed backward, the rear end of the lock plate 25 slides on the taper 27c as shown in FIG. 13B, and the operating lever 10 is once rotated and biased. The control lever 10 is rotated in the anti-lock direction against the elastic force of the member 31, and when the hook portion 27a is aligned with the lock hole 26, the operation lever 10 is rotated in the lock direction by the rotation urging force of the rotation urging spring member 31. By moving, the hook portion 27a can be engaged with the lock hole 26 and locked in the original closed position.

In the above embodiment, in the closing lock mechanism 21, the operation lever 27 is provided on the sewing machine bed 5 side, that is, the upper cover 7, and the lock hole 26 is provided on the opening / closing cover 10 side. Lock holes 26 may be provided on the sewing machine bed 5 side, that is, the upper cover 7 on the opening / closing cover 10 side. In this case, the push button 27 b of the operation lever 27 is provided so as to be exposed to the outside of the opening / closing cover 10.
Further, in the above embodiment, the sewing machine bed 5 is intended for a sewing machine provided with the upper cover 7, but the present invention can also be applied to a sewing machine in which the sewing machine bed 5 is not provided with the upper cover 7.
Furthermore, in the above embodiment, the looper 6 is a vertical swing looper. However, the looper 6 can be similarly applied to a horizontal swing looper, and can be applied to any sewing machine provided with a looper other than a double chain stitch sewing machine. Needless to say, similar effects can be obtained.

An external perspective view of a double chain stitch sewing machine to which the present invention is applied is shown in a closed state of an opening / closing cover. An external perspective view of the sewing machine is shown with the open / close cover half open. It is sectional drawing of the sewing machine bed of the sewing machine. It is a disassembled perspective view of a cover opening / closing apparatus. It is a perspective view which shows the free end side of an opening-and-closing cover in a closed state. It is a perspective view which shows the free end side of an opening-and-closing cover in a half open state. It is sectional drawing of the vibration proof means part of an opening-and-closing cover. It is a top view which shows the free end side of an opening-and-closing cover in a closed state. It is a top view which shows the free end side of an opening-and-closing cover in a half open state. It is a perspective view which shows the free end side of an opening-and-closing cover in a closed state. It is a perspective view which shows the free end side of an opening-and-closing cover in a half open state. It is sectional drawing of the closing lock mechanism of a cover opening / closing apparatus, Comprising: (a) shows a locked state, (b) shows a lock release state, respectively. It is sectional drawing of the closing lock mechanism of a cover opening / closing apparatus, Comprising: (a) shows the state just before locking, (b) shows the state in the middle of locking, respectively. It is sectional drawing which shows the closing lock mechanism of the cover opening / closing apparatus of another Example corresponding to Fig.12 (a).

Explanation of symbols

5 Sewing machine bed 6 Looper 10 Opening / closing cover 10B Free end side 18 of opening / closing cover Hinge 20 Opening biasing spring member 21 Closing lock mechanism 26 Lock hole 27 Operating lever 27a Hook part 27b Push button 30 Axis 31 Rotating biasing spring member 32 Anti-vibration means 33, 35 Anti-vibration rubber

Claims (2)

  An opening space portion in which a looper is accommodated is provided in the sewing bed, and an opening / closing cover for opening and closing the opening space portion opens and closes between a position where the opening space portion is closed and opened with a hinge as a rotation center. An opening biasing spring member for constantly opening and biasing the opening / closing cover between a free end side opposite to the hinge of the opening / closing cover and the sewing machine bed side in a cover cover opening / closing device movably attached And a closing lock mechanism that holds the opening / closing cover in a closed position against an opening biasing force by the spring member, and the closing locking mechanism is either the free end side of the opening / closing cover or the machine bed side A lock hole provided on one side, and an operation lever having a hook portion provided on the other side and capable of being engaged and disengaged with the lock hole, the operation lever having a pivot axis The hook portion is provided at one end as an action point and the pressing button is provided at the other end as a force point so as to be exposed to the outside of the free end side or the sewing machine bed side of the opening / closing cover. The sewing machine cover opening and closing device is provided with a rotation biasing spring member that always rotates and biases the operation lever so that the hook portion engages with the lock hole.   The sewing machine according to claim 1, further comprising a vibration isolating means provided with a vibration isolating rubber that absorbs and relaxes vibrations on the free end side of the open / close cover between the free end side of the open / close cover and the machine bed side. Cover opening and closing device.

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