JPH0790059B2 - Mattress and cushion sewing equipment - Google Patents

Description

The present invention relates to a sewing device for sewing a cover material that covers upper and lower portions of a mattress and a cover material that covers side portions of the mattress along the edges of the mattress or cushion. The device has a movable support surface for moving the mattress along the sewing machine, and the sewing machine
A sewing needle that can penetrate the edge of the cover material that covers the upper or lower portion of the mattress and the edge of the cover material that covers the side portion of the mattress adjacent thereto is provided.

When using such a sewing device, the worker operates the device by standing next to the support base of the sewing machine on the side of feeding the mattress having the cover material into the sewing machine. The worker holds the cover material to be sewn firmly, and the sewing machine sews the cover material accurately at the edge of the mattress. At the same time, a thin strip is fed in and sewn on it to form a decoration that covers the previous seam. When the cover material is sewn along the edge of the mattress to the corner of the mattress, the worker
The machine and, if possible, the support surface must be stopped, the mattress must be rotated 90 ° by hand, and then the sewing machine and the support surface must be activated again.

There are various problems with such existing sewing machines. First of all, the work amount of the worker is very large. In addition to ensuring that the mattress cover material to be sewn is held in the correct sewing position, the operator must stop the sewing operation at the appropriate moment and turn the mattress 90 ° by hand. I have to.
Such work must be performed with extremely high accuracy. Otherwise, the mattress cover material cannot be properly sewn to the surface of the mattress. In particular, when sewing a relatively large mattress, it takes a lot of labor to rotate the mattress 90 °, and as the work continues, the worker becomes tired and the accuracy of the sewing work is impaired.

Therefore, an object of the present invention is to provide a device of the same kind as the device described at the beginning, and yet capable of being operated easily without requiring a great labor.

The present invention achieves this object by providing the device described at the beginning with the following configuration. That is, a rotatable arm that can rotate between a position parallel to the movement direction of the support surface and a position substantially orthogonal to the movement direction is provided on the opposite side of the sewing machine in the movement direction, and is supported. A first sensor for detecting the rearmost corner of the mattress in the direction of movement of the surface is provided near the pivot point of the arm, and holding means for holding the mattress at the corner is provided. , A supporting surface, a holding means, a drive unit of each of the rotatable arms and the first sensor are connected to a control device to stop the sewing machine and the supporting surface when the corner is detected, Further, the holding means and the rotatable arm are moved to the operating position to rotate the mattress 90 ° about the corner portion held by the holding means, and thereafter, the holding means and the rotatable arm are brought to the rest position. It is a structure to return .

As soon as one edge of the mattress is sewn by the sewing device of the present invention, the mattress is automatically rotated 90 ° by the rotatable arm. Therefore, it is possible to omit a part of the work of the worker who requires a great deal of labor. Also, since this operation is automatically performed, it is necessary for the worker to carefully watch whether the mattress is surely sewn to the corners in order to stop the drive section at an appropriate moment. Nor.

As a result, the worker can concentrate more on the work of feeding the mattress cover material to the correct position of the sewing machine.
Accurate sewing work can be performed relatively easily and continuously.
Furthermore, the holding means allows the mattress to be held in the correct position so that when the sewing machine and the support surface are activated again, the next edge can be sewn from the correct point. When sewing the next edge, the pivot point of the mattress must exactly coincide with the intersection of the seams on both adjacent edges. Also, the sewing device may be designed so that the sewing machine and the support surface can be restarted automatically or manually.

The holding means which fulfills the conditions mentioned above can be designed in various ways. Firstly, in a first possible embodiment, the sewing device is provided with a second sensor for detecting the position of the sewing needle, and as soon as the corner of the mattress is detected by the first sensor, the sewing needle is placed at the extended position. Stopping and connecting the second sensor to the controller so that the needle serves as a holding means for rotating the mattress at that position. With such a design, the turning point of the mattress can be made to coincide with the intersection of the seams of the two adjacent edges of the mattress. Since the needle moves at a constant angle with respect to the surface of the support surface, the needle crosses the imaginary line of rotation of the mattress, but this does not cause any inconvenience. This is because the mattress and the cover material to be sewn are made of a flexible material, and the needle has a very short penetration distance.

As already mentioned, the sewing machine has to handle mattresses of various weights, from light to heavy,
The same applies to the force generated when rotating the mattress. For example, when sewing a heavy mattress, if the needle is too thin, excessive stress may cause the needle to bend. Therefore, when using a thin sewing needle, the sewing needle cannot be used as a holding means. The second embodiment solves this problem. In this embodiment, the holding means is formed by a retractable auxiliary needle provided near the sewing needle. Also, a second sensor is attached to detect the position of the needle connected to the control device, and as soon as the corner of the mattress is detected by the first sensor, the needle is stopped in the retracted position, and I am trying to move the auxiliary needle to the extended position. An auxiliary needle thicker than the sewing needle may be used so that the auxiliary needle properly functions as a holding means for a relatively heavy mattress. Further, the auxiliary needle may be installed at a position that coincides with the rotation line of the mattress.

In another embodiment, a third sensor is provided in front of the sewing machine in the moving direction of the mattress. The third sensor is connected to the control device so that the drive speeds of the drive units of the sewing machine and the support surface can be gradually reduced as soon as the corners of the mattress are detected. With this structure, the sewing machine does not stop suddenly. Needless to say, the sudden stop of the sewing machine is not preferable for the sewing mechanism. Also, the work of the worker can be reduced by reducing the sewing speed when sewing to the edge of the mattress. Such a configuration is necessary especially when the worker is unskilled. If the third sensor is attached so that the position can be changed in the moving direction of the mattress, the deceleration distance can be set variously.

The support surface and the respective drive of the sewing machine are preferably connected by a synchronizer so that the mattress moves linearly along the sewing machine. This is because if the speed of movement of the support surface is slower than the speed of movement of the sewing machine, for example, the mattress will be pulled and bent, which is an undesired result. On the contrary, even if the speed of movement of the support surface is faster than the speed of the sewing machine, a problem occurs.

Further, a strip-shaped guide portion may be provided below the support surface, and the support surface may be installed at a constant angle. With this design, the mattress is always supported by this guide.

The actual mattress sewing process is as follows. First, the first stitch of the sewing machine is set at an arbitrary position on the edge portion between the two corner portions of the mattress. When all the edges of the mattress have been sewn, the operator must carefully watch the first stitch of the sewing machine so that the edges are completely sewn. On the other hand, it is useless to sew the edges twice, even partially. Therefore, according to the present invention, the first storage device that stores the first stitch number, the second storage device that stores the second stitch number, and the number of corners detected by the first sensor are counted. The controller is equipped with a counting device to
Also, the number of first stitches between the first stitch and the first corner is counted, and the number of second stitches between the second corner and the third corner is counted, After detecting the fourth corner portion, the controller is provided with a counting device for stitch addition / subtraction for subtracting the first stitch number from the second stitch number. If the number of second stitches is equal to or less than the number of first stitches, a member for stopping the drive unit is connected to the drive unit and provided in the control device. , Can simplify the work. By doing so, the difference between the number of second stitches and the number of first stitches is set to be slightly lower than the number of stitches counted for detecting the first corner portion, so that It is possible to sew so that the eyes do not overlap.

In another embodiment, the device of the present invention is provided with a first storage device for storing a first unit time and a second unit time under the condition that the sewing speed is set constant. A second storage device for storing, a counting device for counting the number of corners detected by the first sensor, and a first unit time from the first stitch to the first corner The second unit time from the second corner to the third corner, and after detecting the fourth corner, the second unit time to the first unit time. The first unit time number and the second unit time number are compared with a counting device for adding / subtracting the unit time number for subtracting a number, and whether the second unit time number is equal to the first unit time number. Or a member connected to the drive unit, which stops the drive unit when the temperature becomes lower than that. It may be designed as a location.

The invention will now be described in more detail in connection with some embodiments.

The sewing device shown in FIG. 1 comprises a support surface consisting of an endless conveyor belt 1 running around pulleys 2, 3. The direction of movement is indicated by the arrow 4.
Next to the conveyor belt 1 is a strip-shaped guide portion 5,
The sewing machine 6 is provided above the guide portion.
Further, a rotatable arm 7 is provided beyond the sewing machine 6 in the movement direction of the conveyor belt 1. This arm 7 can be rotated to a position 8 shown by a dotted line. Place the mattress 9 on the conveyor belt 1,
A cover material that covers the upper surface of the mattress 9 and a cover material that covers the side surfaces of the mattress are sewn by a sewing machine. Reference numeral 10 is the third
Shows the sensor of. This sensor detects the rearmost corner of the mattress in the direction of movement of the conveyor belt 1. The sensor 10 is for slowing down the supply speed of the conveyor device and the sewing speed of the sewing device.

From FIG. 2, a supporting plate having a smooth upper portion of the conveyor belt 1
You can see that it is supported by 11. Further, in the figure, a rotation mechanism 12 (for example, a double-acting air cylinder) of the rotatable arm 7 is shown.

FIG. 3 shows a sewing needle 13 of the sewing machine that operates at an angle so that the cover material on the upper surface of the mattress 9 and the cover material on the side surface of the mattress can be sewn through.
Further, other members such as a guide member for feeding the elongated strip for the seam cover are not shown so as not to complicate the drawing. The first sensor is shown at 14. This sensor 14 stops the driving parts of the conveyor belt 1 and the sewing machine 6 and moves the rotatable arm 7 to rotate the mattress 9 on the conveyor belt 1 by 90 ° so that the corners of the mattress are rotated. It is something to detect. Further, the position of the sewing needle 13 can be detected from the position of the drive wheel 16 of the sewing machine by the second sensor 15. The second sensor 15 may be provided at another place, for example, where the sewing needle 13 is located. When the corner of the mattress is detected by the first sensor 14, the sensor 15 operates to stop the sewing needle 13 at the extended position, the arm 7 operates, and the mattress 9 moves on the conveyor belt 1 centering on the sewing needle 13. Rotate 90 °. After this, the rotatable arm 7 automatically returns to its original position and the next edge of the mattress can be sewn. After that,
Such an operation is repeated.

FIG. 4 shows the second embodiment. In this embodiment, the auxiliary needle 17 is used as a holding means for holding the mattress 9. When the corners of the mattress 9 are detected by the sensor 14,
The second sensor 15 operates and the sewing needle 13 stops at the retracted position. Next, the auxiliary needle 17 extends and enters the mattress, and the rotatable arm 7 operates to rotate the mattress about the auxiliary needle 17. Since the auxiliary needle 17 is right next to the sewing needle 13, the next edge of the mattress can be sewn following the previous stitch.

FIG. 5 is a block diagram of a control device used in the sewing device shown in FIG. The first sensor 14 is connected to the respective drive units 18, 19, 20, 21 of the conveyor belt 1, the sewing machine 6, the rotatable arm 7 and the auxiliary needle 17. As soon as the first sensor 14 detects the rearmost corner of the mattress 9 in the direction of movement of the conveyor belt 1, the drives 18, 19 are switched off and the drives 20, 21 are switched on. When the second sensor 15 for detecting the position of the sewing needle 13 operates, the sensor 15 causes the driving portion 19 of the sewing machine to stop at a position where the sewing needle 13 is placed in the retracted position. If auxiliary needle 17 is located very close to needle 13, needle 13 need not be fully retracted. In this way, the mattress can be easily rotated about the extended auxiliary needle 17. The drive 18 for driving the conveyor belt 1 and the drive 19 for the sewing machine 6 may be connected to the third sensor 10. Then, when the third sensor detects the rearmost corner of the mattress, the speed of the driving units 18 and 19 can be reduced. Finally, by connecting the drive section 18 of the conveyor belt and the drive section 19 of the sewing machine via the synchronizer 22, the movement speeds of the drive sections 18 and 19 can be synchronized, and the mattress to be sewn can be sewn on the sewing machine. It is possible to move it accurately along.

[Brief description of drawings]

1 is a plan view of the sewing machine of the present invention, FIG. 2 is a side view of the sewing machine of FIG. 1, FIG. 3 is a front view of the sewing machine of FIG. 1, and FIG. 4 is a sewing machine of the present invention. 2 is a front view showing a second embodiment of the present invention, and FIG. 5 is a block diagram of a control device used in the sewing device of the present invention. 6 ... sewing machine, 7 ... rotatable arm, 9 ... mattress, 13 ... sewing needle, 14 ... first sensor.

Continuation of the front page (56) Reference JP-A 61-209687 (JP, A) JP-A 61-209686 (JP, A) JP-A 58-200771 (JP, A) JP-A 57-166192 (JP , A) JP-B 55-51593 (JP, B2) JP-B 60-56511 (JP, B2) JP-B 60-26553 (JP, B2) JP-B 1-15318 (JP, B2) JP-B 58-45670 (JP, Y2)

Claims (7)

[Claims] 1. A mattress is provided along a sewing machine having a sewing needle that can penetrate an edge of a cover material that covers the upper or lower portion of the mattress and an edge of the cover material that covers a side portion of the mattress adjacent thereto. For sewing a cover material covering the upper and lower parts of the mattress and a cover material covering the side parts of the mattress along the edge of the mattress or the cushion, which has a movable supporting surface for being placed on and moved. In the sewing device, a rotatable arm that is rotatable between a position parallel to the movement direction of the support surface and a position substantially orthogonal to the movement direction is provided on the other side of the sewing machine in the movement direction. A first sensor for detecting the rearmost corner of the mattress in the direction of movement of the support surface is provided near the pivot point of the arm to hold the mattress at the corner. Holding means is provided, and the respective driving units of the sewing machine, the supporting surface, the holding means and the rotatable arm, and the sensor are connected to a control device, and when the corner is detected, the sewing machine and the supporting surface are connected to each other. The holding means and the rotatable arm are moved to the operating position to rotate the mattress around the corners held by the holding means, and then the holding means and the rotatable arm are moved to the rest position. A mattress or cushion sewing device characterized by being returned to. 2. A second sensor for detecting the position of the sewing needle is connected to the control device, and as soon as the first sensor detects the corner of the mattress, the sewing needle is stopped at the extended position. 2. The sewing machine for mattresses and cushions according to claim 1, wherein the sewing needle serves as a holding means for rotating the mattress at that position. 3. A second sensor for detecting the position of the sewing needle connected to the control device is provided, wherein a retractable auxiliary needle located near the sewing needle is used as the holding means, and the first sensor is the corner of the mattress. The mattress or cushion sewing device according to claim 1, wherein the sewing needle is stopped at the retracted position and the auxiliary needle is moved to the extended position as soon as the portion is detected. 4. A third sensor is provided in front of the sewing machine in the movement direction of the mattress, and the third sensor is connected to a control device so that the corner of the mattress is detected as soon as the corner of the mattress is detected. The mattress or cushion sewing device according to any one of claims 1 to 3, wherein the drive speed of each drive unit is gradually reduced. 5. A drive device for a support surface and a sewing machine are connected by a synchronizer, and the drive units are synchronized to move the mattress in a straight line along the sewing machine. 4. The mattress or cushion sewing device according to any one of 4 above. 6. A first storage device for storing a first stitch number and a second storage device for storing a second stitch number.
A counting device for counting the number of corners detected by the first sensor, a first stitch number between the first stitch and the first corner, and a second corner For stitch addition / subtraction, which counts the number of second stitches between the third corners and detects the fourth corner, and then subtracts the first stitch number from the second stitches And a second counting device for comparing the first stitch number with the second stitch number and driving when the second stitch number becomes equal to or smaller than the first stitch number. The device for sewing a mattress or a cushion according to any one of claims 1 to 5, wherein a member for stopping the portion is provided by being connected to the drive unit. 7. A first storage device for storing a first unit time number, a second storage device for storing a second unit time number, and a corner portion detected by a first sensor. A counting device for counting the number and a first unit time from the first stitch to the first corner, and a second unit time from the second corner to the third corner. Count the number,
After detecting the fourth corner portion, a counting device for adding / subtracting the unit time number for subtracting the first unit time number from the second unit time number is provided, and further, the first unit time number and the second unit time number And a member for stopping the drive unit when the second unit time becomes equal to or smaller than the first unit time, and is connected to the drive unit. A sewing machine for mattresses and cushions according to any one of claims 1 to 5.