JPH0489093A - Stacker for sewing machine - Google Patents

Abstract

PURPOSE:To regularly stack fabrics by providing a fixed holding piece, a movable holding piece fitted to the fixed holding piece and opened by a spring, clamp systems for holding or releasing a fabric, and a clamp closing means. CONSTITUTION:A movable holding piece 29 is invariably opened by a spring 28, when a fabric delivered from a sewing machine is received on this side of a rail 25, a clamp closing means 35 is operated, the movable holding piece 29 is moved against the action of the spring 28 to the position where it is coupled with the rail 25, and the fabric is held between the movable holding piece 29 and a fixed holding piece 27. Clamp systems 26A-26C are guided by the rail 25 and moved while the movable holding piece 29 is coupled with the rail 25 and restricted in the closed state, and the fabric is held and transported by the clamp systems 26A-26C. When the movable holding piece 29 reaches the end of the rail 25 and removed from the rail 25, the movable holding piece 29 is opened by the action of the spring 28 to release the fabric. Fabrics can regularly be stacked.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a sewing machine that grasps cloth sent out from a sewing machine, carries it to a cloth holding table, releases the grip on the cloth there, and stacks it on the cloth holding table. Regarding stackers.

BACKGROUND OF THE INVENTION Stackers for stacking fabric delivered from a sewing machine on a fabric holding table are known and come in various types. One of them, as shown in U.S. Pat. No. 3,126,848, consists of a chain that is passed between the sprockets, a lamp that can be opened and closed and that is attached to the chain and circulates with the chain, and a clamp that allows the chain to engage the sprockets. When it becomes an arc shape, it opens to accept the cloth sent out from the sewing machine, and when the clamp becomes horizontal, it clamps this cloth and carries it to the table, and when it reaches the other sprocket, it opens and carries it to the table. There are some that are stacked on top.

However, with this stacker, the degree of opening of the clamp changes depending on the diameter of the sprocket, and with a large diameter sprocket, the clamp opens less and when releasing the cloth, it may be difficult to slip off, or the cloth may be difficult to open. When gripping, the gripping and release of cloth tends to be unreliable depending on the type and properties of the cloth, such as thick or thin cloth that is easily flexible and may fail to fit.

In order to solve the above problem, the present applicant has previously proposed
No. 26594 discloses a conveyor that is driven in circulation, a support stand attached to the conveyor, a clamp that is attached to the support stand so that it can be opened and closed, and that is always opened by a certain amount due to the action of a spring, and a clamp that is linked to the closing operation of the clamp. a clamp mechanism having a lasochireha that operates and locks the clamp in a closed state and circulates together with the conhair; a device for pushing the clamp against the action of the bubble; and a device installed on the circulation path of the clamp mechanism; We proposed a stacker consisting of a regulating rod that engages with the rasochireha to release the lock and release the clamp.

Problems to be Solved by the Invention According to the stacker described above, the clamp can be opened to the optimum degree regardless of the diameter of the sprocket, but the faster the stacker is, the more the conveyor Centrifugal force may cause the clamp to close again when rotating around the bobber at high speed at the tie end, resulting in the clamp being locked closed and coming to the fabric receiving position at the start of the tie. When this happens, there is a risk that the fabric sent out from the sewing machine will not be able to be accepted.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stacker that reliably clamps cloth at a cloth receiving position, transports the cloth to a predetermined position, and then opens the stacker.

Means for Solving the Problems Therefore, the stacker of the present invention has a conveyor that is driven in circulation, a fixed gripping piece that is attached to the conveyor, and a movable gripping piece that is attached to the fixed gripping piece so as to be openable and closable and that is normally opened by a spring. It consists of a clamp mechanism for gripping and releasing cloth, a rail attached to the conhair and with which the movable gripping piece can travel while being restrained in a closed state, and a rail starting 4.
? Clamp closing means is provided adjacent to the movable gripping member for closing the movable gripping piece against the action of the spring and moving the movable gripping piece to a position where it engages with the rail.

Here, it is desirable to provide a plurality of clamp mechanisms in order to cope with the increase in speed of sewing machines and to enable high-speed processing.

Examples of the clamp closing means include an air cylinder, a solenoid, or an inclined cam, and its operation is preferably provided with a sensor for detecting the cloth and based on a detection signal when the tip of the cloth enters the open clamp. be made to take place. This makes it possible to prevent clamping errors.

It is desirable that the conveyor be provided with a rod at the bottom near the starting end to receive the cloth sent out from the sewing machine to prevent it from drooping. In order to cope with the high speed of the sewing machine, this cloth support is preferably provided with a pair of rods so that the rods move alternately forward and backward across the direction of movement of the cloth so as to support the cloth alternately.

In this case, it is preferable that the rod of the cloth supporter is further movable up and down so that it advances at the upper position, and while it advances, it crushes and then retreats at the lower position. This prevents contact between the preceding cloth and the following cloth, and allows the cloth to be stacked in an orderly manner.

It is desirable that the clamp mechanism temporarily stop in front of the rail and provide a sensor that detects when the clamp mechanism reaches the front of the rail and stops the conveyor to ensure cloth reception and prevent clamping errors. .

The action clamp is always open due to the action of the spring, and when it reaches the front of the rail and receives the fabric sent out from the sewing machine, the clamp closing means is activated and the movable gripping piece is engaged with the rail against the action of the spring. Move it until it fits. Then, the cloth is gripped between the fixed gripping piece and the fixed gripping piece. As the conhair moves, the movable gripping piece engages with the rail, and the clamping mechanism is guided by the rail and moves while being restrained in the closed state. As a result, the cloth is gripped by the clamp mechanism and conveyed.

When the movable gripping piece reaches the end of the rail and comes off the rail, the movable gripping piece opens under the action of the spring to release the cloth.

Embodiment On one side of the table 11, an Oharosokuminon 12 for performing safety stitches consisting of double chain stitches and edge stitches is installed, and on the table on the cloth feeding side in front of the presser foot 13 , a cloth guide 14 that guides the edge of the cloth and sends it under the presser foot.
A fabric sensor 15 for detecting fabric edges is provided behind the presser foot and includes a light sensor including a light emitting part and a reflecting plate.

The table 11 also has a hinge 16 (
(see Fig. 3), the cloth hanger is connected to the table 11 so that it can be raised and lowered, and the cloth hanging that is raised and lowered by the air cylinder 17 is connected to the plate 18.
A stacker, generally designated by the reference numeral 19, is disposed through the stacker.

Stacker 19 is l! The belt conveyor 24 is horizontally suspended along the cloth feeding direction on an example of the frame 22 supported by the frame 121, and has a heald conveyor 24 driven by a step motor 23 and a cross-sectional rail 25, and the belt conveyor 24 has a clamp mechanism 26A. , 26B, and 26C are attached at regular intervals and circulated together with the belt converter 24.

As shown in detail in FIG. 5, the clamp mechanisms 26A, 26B, and 26C have a fixed gripping piece 27 supported by the belt conveyor 24, and are pivotally connected to the fixed gripping piece 27 so as to be openable and closable.
A movable gripping piece 29 is always urged to open by the action of a spring 28, and a fixed gripping piece 27 is attached from both sides of the movable gripping piece 29.
a roller 32 pivotally supported by an arm 31 extending toward;
The clamping mechanism, which consists of a pin 33 that is attached to the movable gripping piece 29 so as to be movable and retractable and is biased by a spring to protrude a certain amount toward the fixed gripping piece 27, and moves together with the conhair 24, reaches the starting end of the rail. When the proximity sensor 30 provided at the end of the container detects this, the roller 32 is stopped, and in the stopped position, the roller 32 is positioned on a support piece 34 of an air cylinder 35, which will be described later. Note 27a
is a stopper that regulates the opening amount of the movable gripping piece 29;
27b is a reflection plate for detecting the position of the clamp by the proximity sensor 30.

As shown in detail in the fourth threshold, an air cylinder 35 equipped with a support piece 34 that moves up and down adjacent to the rail starting end is attached to the frame 22 near the rail starting end, and its operation is controlled by the fabric sensor 15 described above. When a timer (not shown), which is set by an output signal when the leading edge of the cloth sent out from the sewing machine 12 is detected, is timed, the control signal is output from the controller 36. engages with the roller 32 of the clamp mechanism which rises and stops at the starting end of the rail, and lifts the roller 32 against the action of the spring 28 to the same height as the rail 25. In this state, the movable gripping piece 2
9 is closed and the cloth is gripped (see Figure 7).

As the clamps 26A, 26B, and 26C holding the cloth are guided by the rail 25 and moved by the driving of the conhair 24, the roller 32 is transferred onto the rail from the support piece 34, and rolls on the rail. When the roller 32 reaches the end of the rail and comes off the rail 25, the movable gripping piece 29 grips the bar 22.
8 to open and release the gripped cloth. The released cloth falls onto the cloth mounting table 37.

As shown in detail in FIG. 8, a pair of air cylinders 38A and 38B are arranged below the frame 22 at right angles to the cloth feeding direction, and are arranged side by side with their positions shifted in the cloth feeding direction, and Both ends are passed through the downwardly protruding U-shaped parts 4 of a pair of horizontal arms 40 that are supported by air cylinders 39A and 39B and move up and down, and both ends are fixed to U-shaped parts 41, and the air cylinders 38A and 38B The base end is pivotally supported by a crosspiece 43 so that it can pivot vertically. The cloth receiver rods 44A and 44B, which are piston ronds, move back and forth in a direction perpendicular to the cloth feeding direction below the circulation path of the clamp mechanisms 26A, 26B and 26C, and support the cloth fed out during ejection. When the cloth is retracted, the supported cloth is released, and its forward and backward movement and vertical movement are performed alternately. In other words, the cloth tray is rod 4.
4A and 44B alternately move forward and backward, and the horizontal arm 40 moves vertically by raising and lowering, and the cloth is supplied to the cloth hook when the rod protrudes in the upper position, and when it descends and retracts. It is their turn to release the supported cloth.

9A to 9D show the order of operation of the cloth holders pE44A and 44B, in which one cloth holder pE44A protrudes and the cloth W
, when descending with the other cloth holder hanging on the rod 4
4B rises while retracted (Figure 9A).

After the rod 44B reaches the upper position and protrudes, the next cloth W2 that is sent out hangs on the rod 44B, while the rod 44A retracts and releases the supported cloth W1.
(Fig. B), then the cloth holder rises while the rod 44A is retracted, and the rod 44B of the cloth holder supporting the cloth W2 descends (Fig. 9C), and then the cloth holder moves to a new position with the rod 44A protruding. Cloth W
, is hung, while the cloth holder releases the cloth W2 which is retracted and supported by the rod 44B (FIG. 9D).

As described above, the cloth support can handle higher speeds by moving the rod forward and backward and up and down.

The rods 44A and 44B of the cloth holder move forward and backward at the same time, and even when the rod of one cloth holder is in the process of protruding and the rod of the other cloth holder is in the process of retracting, the cloth hangs on the rod of the cloth holder in the upper position. This is because the cloth holder in the lower position will not hang on the rod, and the cloth released from the rod in the lower position will not hang on the rod again in the upper position.

The cloth holder in the lower position has its rod protruding before its rod retreats, and the cloth holder in the upper position has its rod protruding, and the same is true when both the rods of the cloth holder in the canvas holder are in a state of protruding.

The vertical movement of the cloth holders 44A and 44B is performed when the clamp mechanism reaches the stop position and the proximity sensor 30 detects this, and the movement is performed by the clamp mechanisms 26A, 26B and 26C.
This is done when the end of the rail is reached and a proximity sensor (not shown) detects the clamp mechanism.

Reference numeral 45 shown in FIGS. 1 to 3 is a guard bar that prevents the cloth from moving laterally with the rod when the cloth supporter supporting the cloth moves back.

The controller 36 includes an automatic sewing mode/manual mode changeover switch, a switch for lifting and lowering the presser foot 13, and an O switch for the sewing machine motor drive circuit.
Output circuits for N-OFF switch control and valve operation of the air ring cutting device, air cylinder including a timer set by the input signal from the fabric sensor 15] 7 and 35 control circuit, input from the proximity sensor 30 The air cylinders 38A and 38B operate according to a signal and move the rods 44A and 44B alternately forward and backward and up and down.
, 39A, 39B, a circuit for driving the conveyor driving step motor 23, and the like.

Operation First, set the mode changeover switch on the controller 36 to automatic (at this time, the presser foot 13 is up).First, place the fabric on the sewing machine table, pass the edge of the fabric through the fabric guide 14, and feed the leading edge of the fabric under the presser foot. It's crowded. After the leading edge of the cloth is fed under the presser foot and the presser foot 13 is lowered, the sewing machine 12 is driven to perform hem stitching on the edge of the cloth.

When the leading edge of the fabric fed out from the sewing machine 12 is detected by the fabric sensor 15, a timer is activated, and when a set time has elapsed (at this time, the leading edge of the fabric W2 is detected by the clamp mechanism 15).
6B), the air cylinder 35 is operated and the support piece 34 lifts the roller 32 to the same height as the rail 25, and grips the tip of the cloth.

On the other hand, while the proximity sensor 30 detects the clamp mechanism 26B, the step motor 23 that drives the conhair 24
is stopped, and the above-mentioned clamping of the cloth tip is performed while it is stopped. Thereafter, the cloth hanging plate 18 is lowered by the operation of the air cylinder 17. After the air cylinder 35 operates and the set time (0.1 seconds) elapses until the cloth is gripped, the step motor 23 starts and the belt conveyor 24 moves.
(See Figure 2).

When the proximity sensor 30 detects the clamp mechanism 26B, the output signal causes the rod 44B to rise.
The rod 44A lowers the cloth receiver. In addition, the descended cloth hanger is attached to rod 4.
4A holds the previous cloth W (FIG. 9A).

Due to the movement of the belt conveyor 24, the roller 32 of the clamp mechanism 26B transfers from the support piece 34 to the rail 25, and the preceding clamp mechanism 26A comes off from the end of the rail, and the cloth W
At the same time as I is released, a proximity sensor located adjacent to the end of the rail detects the clamp mechanism 26A. Then, the output signal causes the rod 44B to protrude from the cloth holder, and the rod 44A to retract the cloth holder, releasing the cloth W1 (Fig. 9B).
The released cloth W falls onto the cloth holding table 37 and is held there as shown by the arrow in FIG. The protruding cloth holder is rod 44B
The cloth W2 sent out from the sewing machine is hung on top. As the clamp mechanism 26B, which grips the end of the cloth due to the movement of the held con hair 24, pulls the cloth holder W2 hung on the rod 44B and moves to the left in the figure, the cloth sensor 15 detects the rear end of the cloth W2. When detected, the plate 18 of the cloth hanger rises. When the leading edge of the next new cloth fed out from the sewing machine is detected by the cloth sensor, the leading edge of the cloth is clamped by the clamp 26C, which reaches the cloth gripping position and stops in the same manner as described above.

In the above embodiment, an air cylinder is used to lift the roller 32, and the support piece having a horizontal surface parallel to the rail 25 is moved up and down, but in another embodiment, the support piece is guided in the cloth feeding direction. An inclined cam with successively elevated surfaces is provided adjacent to the beginning of the rail so that the end of the guide surface is at the same height as the rail. In yet another embodiment, the inclined cam is configured to move forward and backward in the cloth feeding direction,
When the clamp mechanism is located just in front of the rail, it moves in the opposite direction to the cloth feeding direction to lift the roller.

In these embodiments, the rollers are reliably guided to the rail by an inclined cam immediately before the rail.

Effects of the Invention The present invention is configured as described above, and has the following effects.

According to the stacker of the present invention, since the clamp mechanism is reliably opened by the action of the spring at locations other than where it engages with the rail, it is ensured that the fabric sent out from the sewing machine enters before the clamp mechanism engages with the rail. In addition, the cloth can be reliably released at a predetermined position away from the rail, and the cloth can be reliably held when it is engaged with the rail, allowing the cloth to be piled up in an orderly manner.

In addition, in the case of movable gripping pieces equipped with rollers, the clamp mechanism can run smoothly, and if a clamp closing means that can be controlled by electromagnetism, such as a solenoid or air cylinder, is used, it is possible to achieve higher speeds. can.

In addition, when the cauterizing cloth tray uses a rod, the cloth tray can process the cloth fed at high speed by the alternating movement of the rod, and can stack the cloth in an orderly manner.

Furthermore, if the clamp mechanism is detected by a proximity sensor and temporarily stopped in front of the rail, the cloth can be reliably entered and gripped, and gripping errors can be prevented.

Furthermore, if a cloth detection sensor is provided to detect the edge of the cloth and actuate the clamp closing means based on the output signal, it is possible to close the cloth after it enters the clamp mechanism in the open state. This can prevent mistakes in gripping the cloth.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a surging device using a stacker according to the present invention, Figs. 2 and 3 are operational views of the stacker, Fig. 4 is a perspective view of a clamp closing means provided adjacent to the rail starting end, and Fig. 5 Figure 6 is a perspective view of the clamp mechanism, Figure 6 is a front view of the clamp mechanism just before it reaches the clamp closing means, Figure 7 is a front view showing the clamp mechanism gripping the fabric, Figure 8
The figure is a perspective view of the cloth receiver and rod actuating device, and FIGS. 9A to 9D are diagrams showing the order of operation of the cloth receiver and rod. 11...Table 12...Overlock sewing machine 13
... Presser foot 15 ... Fabric sensor 18 ... Cloth hanger is a board
19... Stacker 24... Belt conveyor 26A, 26B, 26C... Clamp mechanism 27... Fixed gripping piece 29... Movable gripping piece 30... Proximity sensor 3
2...Roller 33...Pin 34...Support piece 35...Air cylinder 36...Controller 38A
, 38B, 39A, 39B...Air cylinder 44A
, 44B...The cloth holder is a stick

Claims (7)

[Claims] (1) A clamping mechanism that grips and releases cloth, consisting of a circulating conveyor, a fixed gripping piece attached to the conveyor, and a movable gripping piece that is attached to the fixed gripping piece so that it can be opened and closed, and is normally opened by a spring. a rail attached to the conveyor, with which the movable gripping piece can be engaged and run while being restrained in a closed state, and a rail provided adjacent to the starting end of the rail to allow the movable gripping piece to resist the action of the spring. and a clamp closing means for closing and moving the clamp into a position of engagement with the rail. (2) The movable gripping piece is provided with a roller that rolls on a rail and a pin that projects toward the fixed gripping piece by means of a spring, while the clamp closing means is an air cylinder or a solenoid equipped with a support piece, and the clamp closing means is an air cylinder or a solenoid equipped with a support piece. 2. A stacker for a sewing machine according to claim 1, wherein said roller is raised to the same height as a rail by raising said roller. (3) The sewing machine according to claim 2, wherein the clamp closing means is an inclined cam whose guide surface is raised sequentially in the cloth feeding direction and whose end is at the same height as the rail, instead of being an air cylinder or a solenoid. Stacker. (4) The stacker for a sewing machine according to claim 3, wherein the inclined cam is movable back and forth in the cloth feeding direction, and moves in the opposite direction to the cloth feeding direction when the clamp mechanism reaches just in front of the rail. (5) A stacker for a sewing machine according to claim 1, wherein a pair of cloth receiving rods are provided below near the starting end of the rail so as to alternately advance and retreat across the direction of travel. (6) The stacker for a sewing machine according to claim 5, wherein the cloth receiving rod is movable up and down, advances at the upper position, descends as it is, and retreats at the lower position. (7) A stacker for a sewing machine according to claim 1, wherein a proximity sensor is provided to detect the clamp mechanism, and the clamp mechanism is stopped immediately before the rail based on an output signal from the proximity sensor. (8) A stacker for a sewing machine according to claim 1, wherein a cloth detection sensor is provided, and the clamp closing means is actuated based on an output signal from the cloth detection sensor.