JPS628435Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to an electromagnetic clutch in which a driving shaft and a driven shaft, each of which is rotatably supported on a frame, are connected and released by excitation and demagnetization of an electromagnet. The present invention relates to an electromagnetic clutch having a structure for stopping at a fixed position.

A conventional electromagnetic clutch is configured such that a driving shaft and a driven shaft, each rotatably supported by a frame, are connected and disconnected from each other by excitation and demagnetization of electromagnets.

However, in conventional electromagnetic clutches like this, the driven shaft rotates and stops only when connected to and released from the driving shaft, so each time rotation stops due to inertia etc., the initial state of the driven shaft relative to the frame is There is a drawback that the setting positional relationship is shifted.

By the way, when cutting off the starting end of a bar in a saw device that automatically cuts bars continuously, it is necessary to connect and disconnect the bar feeding device and the cut length setting device. . In such a case,
When using a conventional electromagnetic clutch, the initial position of the driven shaft relative to the frame will shift.
A problem arises in that a situation may arise in which the truncation length that was assumed in advance is not set.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic clutch that eliminates the drawbacks and problems of the prior art and can always stop the driven shaft at a fixed position relative to the frame.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an automatic bar cutting saw device equipped with a cutting length setting device equipped with an electromagnetic clutch according to an embodiment of the present invention. This automatic bar saw device includes a bar supply device A that supplies long bars that are raw materials to be cut, a bar feed device B, a bar clamp device C, a sizing device D, and ferrous and non-ferrous materials. It is composed of a dual-purpose saw device E, a cut material discharge device F, a starting end truncation operation control device G, and a continuous cutting operation control device H. These devices will be explained one by one.

The bar supply device A stores a plurality of bars to be cut, and supplies the bars one by one to the bar feed device B at a timely manner. The bar supply device A shown in FIG.
It is provided with stoppers 3 projecting from the upper surfaces of the lowermost slopes of both bars, and a push-up device consisting of a cylinder (not shown). A plurality of bars 4 are arranged in a line and placed between the upper surfaces of both bars 2, and are prevented from sliding down by a stopper 3 at the bar at the forefront. The bar 4 in contact with the stopper 3 at the frontmost position is pushed up by the lifting device installed directly below the bar 4.
It is pulled up from between the stopper 3 and the next stage bar 4, climbs over the stopper 3, and slides down to the bar feeder B. Then, the next-stage bar comes into contact with the stopper for the next feeding operation.

The bar feeding device B intermittently feeds the supplied bar material in its longitudinal direction, and the bar feeding device B shown in FIG. 1 is equipped with a roller conveyor 6 that is elongated in the conveying direction. The roller conveyor 6 is laid parallel and horizontally in front of the bar feeder A, receives one supplied bar 4, and supports it so as to be movable in the longitudinal direction. The frame on the front side of the conveyor 6 also serves as a guide rail 7 extending in the conveyance direction, and a movable body 8 is slidably installed over this rail 7. A pusher 9 is fixed to the upper part of the moving body 8, and the pusher 9 is arranged so as to be able to move on the roller conveyor 6 while pushing the rear end surface of the bar 4. Said rail 7
A pair of sprockets 10 (only the right end one is shown in the figure) are each pivotally supported at both ends of the sprocket, and a chain 11 is wound between the two sprockets 10. One sprocket 10 is adapted to be rotated at appropriate times by a hydraulic motor (not shown), and the moving body 8 is connected to a part of the chain 11. Therefore, the pusher 9 fixed to the moving body 8 repeatedly runs and stops via the sprocket and chain as the hydraulic motor starts and stops, and intermittently feeds the bar 4 on the conveyor 6. It returns to its original position by reversing.

The clamping device C securely fixes the vicinity of the cut point of the bar material during cutting, and is installed at the end position on the feeding side of the bar material feeding device B at right angles to the feeding direction, as shown in Fig. 1. , is constructed as shown in FIG. In FIGS. 1 and 2, on the upper surface of the base 15 installed at the end position on the feeding side of the bar feeder B, there is a receiving block 16 having a substantially square frame body, which holds the bar 4 in a square internal space. It is installed perpendicular to the feeding direction of the bar so that it can be inserted through it. Cylinders 17a and 17b are installed at right angles on the outer surfaces of the upper wall 16a and front wall 16b of the receiving block 16, respectively.
The pistons 18a, 18b of each cylinder have an upper wall;
It penetrates the front wall at right angles and moves forward and backward in the internal space of the receiving block 16 in the vertical and horizontal directions, respectively. Each piston is prevented from rotating relative to the cylinder via a key 19, and threaded rods 20a and 20b are respectively screwed into the center of the piston so as to be able to adjust the amount of movement in and out. Each pressing piece 21a, 21b has an uneven shape at the inner tip of each threaded rod.
is rotatably attached in a manner that prevents it from coming off, and each pressing piece has one surface in sliding contact with the inner surfaces of the rear wall 16d and lower wall 16c of the receiving block, and its ventral sides are in contact with the inner surfaces of the lower wall 16c and rear wall 16d, respectively. They are arranged facing each inner surface and so as not to interfere with each other. Therefore, as shown in FIG. 2, the two pressing pieces 21a and 21b can press the bar 4 against each pressure receiving surface of the receiving block 16 by the forward movement of each piston, and can securely fix it.

On the other hand, a pair of primary cylinders 22 are attached at appropriate locations on the base 15, corresponding to the pair of cylinders described above. The piston 23 of the primary cylinder 22 has a stepped cylindrical body with large and small diameters, with the large diameter part 23a being on the input side and the small diameter part 23b being on the output side. The output chamber 22b of the cylinder into which the small diameter portion 23b of the piston is fitted is communicated with the press chamber of the secondary cylinder via a tube or conduit. Furthermore, the inside of the cylinder chamber into which the large-diameter portion 23a of the piston is fitted is divided by the large-diameter portion 23a into two front and rear chambers: a push-back chamber 22a' and an input chamber 22a, and the input chamber 22a is arranged in two directions. The control valve 24 is communicated with the pump 25 through one port, the push-back chamber 22a' is communicated with the pull-back chamber of the secondary cylinder via a tube or conduit, and the two-way control valve 24
It is communicated with the tank 26 through the port.
Two-way control valve 24 and primary cylinder input chamber 22a
A pressure regulating valve 27 is interposed between the
By operating this valve 27, the pressure supplied to the input chamber 22a is adjusted, and therefore the clamping force of the bar 4 by the aforementioned pressing pieces 21a, 21b is adjusted to prevent insufficient fixing of the bar 4 or clamping. Deformation of the bar 4 due to excessive force can be prevented.
In particular, since non-ferrous bars are easily deformed, it is better to reduce the clamping force. Note that the pressure regulating valves 27 may be arranged separately for each input chamber 22a, or may be arranged on the output chamber 22b side of the primary cylinder.

As is clear from the above, this clamping device C
According to the method, since the bar 4 is gripped vertically and horizontally, it is fixed accurately and reliably.

The sizing device D comes into contact with the front end of the bar 4 fed by the bar feeding device B, and defines the length of the bar to be cut. The sizing device D shown in FIG. 1 is equipped with an arm 30 whose one end is rotatably supported on the upper side of the base 15 on the side opposite to the clamp device C. It is adapted to be rotated in the vertical direction inside. A support body 31 is provided at the free end of the arm 30, and supports the sizing bar 32 by inserting it in a slidable manner parallel to the feeding direction of the bar.
By adjusting the position relative to the support 31, the cutting length is selected. When the arm 30 rotates to the top dead center, the sizing bar 32 is located on the extension of the bar 4 in the feeding direction and comes into contact with the front end surface of the bar 4, and due to this contact, it is installed in the support 31. A limit switch (not shown) is operated to stop feeding the bar and determine the cutting length.

In FIG. 1, the saw device E for both ferrous and non-ferrous metals used in this automatic bar cutting saw device includes a bar feeding device B, a clamp device C,
It is installed in the gathering part of the sizing device D, and is configured as shown in FIGS. 3 to 5. In FIG. 3, a pair of brackets 35 are spaced apart from each other and protrude from the upper surface of the rear wall of the base 15, and a lower rear portion of a frame 36 forming a hollow, substantially rectangular parallelepiped is disposed between the brackets. A pair of support shafts 37 projecting at right angles from both sides of the frame are rotatably fitted to both brackets, so that the frame is pivotably supported vertically within a vertical plane. A cylinder 38 is located approximately in the center of the base 15.
is rotatably supported in an upward position via a support shaft 39, and the upper end of the piston rod 40 of the cylinder is
The frame 36 is rotatably connected via a pin 42 to a bracket 41 protruding from approximately the center of the lower surface of the frame 36. Therefore, the frame 36 is rotationally driven by the cylinder 38 and can support part of the load. On the outside of the side surface facing the clamp device C on the free end side of the frame 36, a saw blade 43 capable of cutting both ferrous bars and non-ferrous bars is supported by a saw blade shaft to be described later. The blade rotates in a plane perpendicular to the bar 4 to be cut (in this embodiment, a vertical plane) and is arranged so that it can cut into the bar at right angles as the frame rotates. A speed change mechanism is built into the frame 36 to change the rotation of the saw blade 43 between a low speed for cutting iron and a high speed for cutting non-ferrous metals, and the frame substantially constitutes a gearbox.

3 to 5, a front lid 44 and a rear lid 45 are detachably provided on the upper surface of the frame 36. As shown in FIGS. A shaft hole 46 is perpendicularly bored in approximately the center of the rear lid 45, and a central shaft 48 of a turntable 47 placed on the rear lid is rotatably fitted into the shaft hole. This table can be rotated approximately 90 degrees above the lid body around its axis, and can be fixed at a predetermined position with bolts or the like. A motor 49 is installed on the table 47, and a driving pulley 51 is fixed to the tip of a rotating shaft 50 of the motor. Inside the frame 36, a saw blade axis 52 is located at the free end of the frame parallel to the extending direction of the bar 4, a wheel axis 53 is parallel to the saw blade axis 52, and a worm axis 54 is perpendicular to the wheel axis 53. As shown in FIG.
They are each rotatably supported and mounted on a mount. One end of the gear shaft 55 projects outward from the rear wall of the frame 36, and a first driven pulley 57 is fixed to the projecting end. This pulley 5
A first belt 58 is removably wound between the drive pulley 51 and the drive pulley 51. Gear shaft 55
A spline 59 is formed at the other end, and the gear block 6 is slidably fitted into the spline. A first driving gear 61 and a second driving gear 62 having a smaller diameter are fixed to the gear block in parallel with each other, and the lower end of a slider rod 64 is engaged with the outer periphery between the two gears of this block. A groove 63 is formed in an annular shape. The slider rod 64 passes upward through a long hole 65 that is bored parallel to the axis of the gear shaft 55 at a position directly above the gear shaft 55 in the front lid body 44, and is formed along the long hole on the top surface of the lid body. A slider piece 67 fitted into the guide groove 66 allows translation in the axial direction of the gear shaft 55.

A driven gear block 68 is fitted and fixed to one end of the worm shaft 54 parallel to the gear shaft 55 that directly faces the gear block 60.
8 has a first driven gear 69 and a second driven gear 69 with a larger diameter.
The driven gears 70 are spaced apart from each other and fixed in parallel. By operating the slider rod 64, the first
The meshing between the driving gear 61 and the second driven gear 69 and the second driving gear 62 and the second driven gear 70 is switched, and at the saw blade rotation speed for iron cutting, the meshing is approximately
Two-speed transmissions of 23rpm and approximately 32rpm are now being created.

A spline 7 is provided at the other end of the worm shaft 54.
1 is formed, and a worm 72 is slidably fitted to the spline. An annular engagement groove 73 is formed on the outer periphery of one end of the worm 72 and is engaged with the lower end of the second slider rod 74 . This rod 74 passes upward through a long hole 75 that is bored parallel to the worm shaft directly above the worm shaft in the lid 44, and a guide groove is formed along the long hole on the top surface of the lid. The worm shaft can be moved in parallel in the axial direction of the worm shaft by means of a stider piece 77 fitted in the worm shaft. Worm shaft 7 of wheel shaft 53
A wheel 78 that can freely engage with the worm 72 is fixed to a portion perpendicular to the worm 72, and the engagement between the worm 72 and the wheel 78 causes the second slider rod 74 to move in parallel in one direction, thereby slidingly displacing the worm. It is released by this, and is brought back into engagement by returning it to its original position.

One end of this wheel shaft 53 protrudes through the side wall opposite to the saw blade 43, and a second driven pulley 79 is fixed to the protruding end. Between this pulley and the driving pulley 51, there is a fourth
As shown by the imaginary line in the figure, the turntable 47 is rotated 90 degrees with respect to the rear cover 45 so that the shaft 50 of the motor 49 is parallel to the wheel shaft 53, and the second belt 80 is detachably attached. It can be wrapped around. It is preferable that the second belt 80 and the first belt 58 be able to be used interchangeably.

A driving helical gear 8 is located at the other end of the wheel shaft 53.
1 is fixed, and this gear 81 is connected to the saw blade shaft 52.
It meshes with a driven helical gear 82 fixed to the. One end of the saw blade shaft 52 protrudes through the side wall directly facing the clamp device C, and the saw blade 43 is fixed at right angles to the protruding end.

When cutting ferrous materials with the saw device E for both ferrous and non-ferrous metals having the above configuration, the motor 49 is installed parallel to the gear shaft 55, and then the driving pulley is 51 and the first driven pulley 57, and the second slider rod 74 is operated to mesh the worm 72 and the wheel 78 with each other. When the motor operates in this state, the rotation of the motor shaft 50 is caused by the driving pulley 51, the belt 58, the first driven pulley 57, the gear shaft 55, the second driving gear 62, the second
Driven gear 70, worm shaft 54, worm 72,
Wheel 78, wheel shaft 53, helical gear 8
1, 82, is transmitted to the saw blade 43 via the saw blade shaft 52, and in particular is greatly decelerated between the worm and the wheel, causing the saw blade 43 to rotate at a low speed. For example, it is possible to reduce the rotation speed of the motor from 1440 rpm to 23 rpm of the saw blade. Therefore, the saw blade rotates at low speed and high torque, and can cut even highly hard iron materials with high precision and a good cut. If you want to improve the cutting efficiency, operate the first slider rod 64 to mesh the first driving gear 61 and the first driven gear 69, change the reduction ratio, and reduce the saw blade 4.
3 can be slightly increased in rotation speed.

Next, when cutting a non-ferrous material, as shown by the imaginary line in FIG.
9 is installed parallel to the wheel axis 53,
A belt 80 is wound between the driving pulley 51 and the second driven pulley 79, and the second slider rod 74 is operated to release the meshing state between the worm 72 and the wheel 78. When the motor operates in this state, the rotation of the motor shaft 50 is caused by the driving pulley 51, the belt 80, the second driven pulley 79, the wheel shaft 53, the helical gears 81 and 82, and the saw blade shaft 5.
2 to the saw blade 43, and is slightly decelerated between both pulleys and a helical gear, causing the saw blade 43 to rotate at high speed. For example, motor rotation speed 1440 rpm,
A reduction ratio with a saw blade rotation speed of 700 to 900 rpm is appropriate. Therefore, the saw blade rotates at high speed and can cut iron materials, such as aluminum and copper materials, which have lower hardness than iron materials, with high efficiency and precision.

In the above embodiment, the case where the worm shaft and the first driven pulley are rotated in conjunction with each other by interposing a gear shaft has been explained, but the first driven pulley may be directly connected to the worm shaft and rotated in conjunction with each other. often,
Similarly, the saw blade may be directly connected to the wheel shaft for interlocking rotation. Each pulley and belt can be replaced with a sprocket and chain. Moreover, although the case has been described in which the worm and the wheel are engaged and disengaged by displacing the worm, this may be done by displacing the wheel. Furthermore, a clutch mechanism may be provided in the middle of the worm shaft to release the interlocking state between the worm shaft and the wheel shaft, but since the worm remains engaged with the wheel, the transmission torque of the wheel shaft during non-ferrous cutting is reduced. May decrease.

As mentioned above, according to the saw device for both ferrous and non-ferrous metals having the above configuration, ferrous materials can be cut at low speed rotation, and non-ferrous materials can be cut at high speed rotation.
This single device can cut both ferrous and non-ferrous materials with high precision and efficiency, saving equipment costs and installation space, and has a simple structure that eliminates the need to replace saw blades and is easy to handle. This is easy and can improve the durability of the saw blade.

Next, the cutting material discharging device F discharges the material cut by the saw device E from the operating space of the saw blade to another location, and the cutting material discharging device F shown in FIG. It is installed directly below the clamp device C, sizing device D, and saw device E above.
This device F is equipped with a fixed chute 85, a sorting chute 86, and a product chute 87, and each chute is arranged side by side in a series with an inclination in the same direction. The sloping upper end of the fixed chute 85 is located at the saw blade side end of the clamp device C, and receives the falling material that has been cut by the saw blade, and causes it to slide downward and be discharged. The sorting chute 86 is supported by the base 15 so that it can swing freely in the discharge direction with its inclined lower end aligned with the upper end of the product chute 87, and is driven to swing by a cylinder (not shown) built into the base. It's summery. The sorting chute is oscillated by a cylinder when the saw blade cuts off parts that are unsuitable for use as a product, that is, both ends of the bar, and the sorting chute is moved from the lower end of the fixed chute 85 to the base 15. Drop any unused materials into a waste conveyor or into a waste container. Further, when the saw blade is cutting the product, the sorting chute is in a state where the fixed chute 85 and the product chute 87 are connected, and the product is guided from the fixed chute to the product chute. A product chute 87 is attached to the base 15 and has an inclined lower end facing a product container or product conveyor.

The cutting operation control device G is used to cut off the end of a bar, which is normally a raw material, because it is improperly deformed and cannot be used as a product. It is equipped with a starting end detection device I and a truncated length sizing device J, and each device I and J is constructed as shown in FIGS. 6 and 7, respectively.

As shown in FIG. 6, the bar end detection device I is installed on one side of the bar feeding device B near the front of the clamp device C, and is attached to a frame 88 attached to the upper surface of the base 15. A rotatably supported shaft 89, an L-shaped detector 90 fixed to the tip of this shaft, a cam 91 fixed to the middle part of this shaft, and a plurality of limit switches _LS1 to LS. _Four
It is equipped with The cooperation of each switch with other parts will become clear later.

As shown in FIG. 7, the truncated length sizing device J is installed at the rear end of the roller conveyor 6 of the bar feeding device B, and is equipped with an electromagnetic clutch K according to an embodiment of the present invention. The driving shaft of the clutch K is interlocked with the pusher feed sprocket 10 of the bar feeder B via a winding transmission mechanism or the like.

In FIG. 7, a frame 93 of an electromagnetic clutch K is installed on the rear end surface of the roller conveyor 6.
A drive shaft 92 of the clutch is rotatably supported on the frame, and this shaft is interlocked with the support shaft of the sprocket 10. A driven shaft 94 is rotatably supported by the frame 93 and arranged on an extension of the driving shaft, and both shafts abut each other rotatably. A driving drum 95 is fitted onto the outer periphery of the driving shaft 92 via a key 96 in a non-rotating state and slidably back and forth in the axial direction, and a meshing portion 97 is provided on one end surface of the drum.
is formed. A driven drum 98 is integrally formed at one end of the driven shaft 94, and a meshing portion 99 that can freely mesh with the meshing portion 97 of the driving drum is formed on one end surface of this drum. An electromagnet 100 is built in the rear part of the meshing part 99 of the driven drum 98, and the driving drum 95 is activated by excitation and demagnetization of this electromagnet.
reciprocates to cause the meshing parts 97 and 99 to engage and disengage, thereby coupling and disengaging the driving shaft 92 and driven shaft 94.

A first hole 101 is formed in a portion of the frame 93 directly facing the outer peripheral surface of the driven drum in the radial direction of the drum, and a first pin 102 is slidably inserted into this hole. An electromagnet 103 is fixed to the frame on the outer periphery of the rear end of the first pin, and this electromagnet is connected to the limit switch LS ₂ shown in FIG.
The first pin is reciprocated by excitation and demagnetization according to the command. A through hole 1 is provided at a position directly facing the first hole 101 of the driven drum 98.
04 is bored in the radial direction perpendicular to the center line, and a second pin 105 is slidably inserted into the through hole. The second pin has a length approximately equal to the length of the through hole, that is, the diameter of the driven drum, and is movable in and out so that one end protrudes from one end of the through hole and can be inserted into the first hole. A spring 106 is interposed within the other end of the through hole to bias the one end of the second pin in a direction to protrude. A second hole 107 having a smaller diameter than the first hole is formed in the frame 93 at a position directly opposite to the first hole, sandwiching the driven drum, so as to face the through hole, and a third pin 108 is slid into this hole. It can be inserted freely. The rear end of the third pin is housed in a frame 109 fixed to the frame, and a spring 110 is interposed within the frame to constantly bias the third pin toward the driven drum. The third pin is the second
When the hole directly faces one end of the through hole, it is biased by a spring so that the tip can be inserted into the through hole. A limit switch LS ₅ is disposed behind the third pin of the frame, and this switch cooperates with the electromagnet 100 of the clutch to excite and demagnetize it.

The rear end of the driven shaft 94 projects outward from the frame 93, and first, second, and third cams 111, 112, and 113 are respectively attached to the projecting ends so that their angles can be adjusted. Three limit switches LS ₆ , LS ₇ , and LS ₈ are provided outside the frame 93, corresponding to the three cams, respectively. The cooperation status of each switch will become clear in the following operation explanation.

Next, the operation of the truncation operation control device G according to the above configuration will be explained, and the operation of the electromagnetic clutch according to the above embodiment will be explained.

When a new bar material 4 is supplied onto the roller conveyor 6, a supply detection switch installed on the conveyor is activated, and the hydraulic motor of the feeding device B is activated to operate the pusher 9.
to start feeding the bar. When the bar 4 is fed and its front end contacts the detector 90 as shown by the solid line in FIG. 6, the switch _LS1 is actuated to cause the hydraulic motor to perform a constant speed feeding operation. When the detector is pushed by the bar fed at a constant speed and rotates to the state shown by the dashed line in Fig. 6, the switch LS ₂ is operated via the cam 91, and the cutoff length is determined as shown in Fig. 7. An excitation command is given to the electromagnet 103 of the magnet device J.

When this electromagnet 103 is excited, the first pin 10
2 protrudes from the first hole 101 and inserts one end into the first hole to prevent the driven drum 98 from rotating.
Pin 105 is pushed into through hole 104. At the same time, the pushed-in second pin pushes out the third pin 108 inserted into the through hole at the other end. At this time,
The contact surfaces of the first pin and the second pin, and the contact surfaces of the second pin and the third pin respectively coincide with the outer surface of the driven drum, so that the driven drum can freely rotate. When the third pin is pushed out, switch LS ₅ is actuated to provide an energization command to clutch electromagnet 100. When this electromagnet is excited, the driving drum 95 is attracted, the two drums mesh, and the driving shaft 92 and driven shaft 93 are connected. Since the driving shaft rotates in conjunction with the sprocket 10, the constant speed rotation of the sprocket 10, which feeds the bar at a constant speed through the pusher by the drive of the hydraulic motor, is transmitted to the driven shaft, and the driven shaft begins to rotate at a constant speed. In this way, the initial position of the driven shaft is regulated with respect to the frame via the second and third pins, and it begins to rotate after these pins are removed, so the driven shaft maintains a preset positional relationship with respect to the frame. always maintain it reliably.

When the constant speed feed progresses a little, the detector 90 rotates until it rests on the bar ₄ as shown by the two-dot chain line in FIG. Give a degaussing command to. The first pin 102 is pulled into the first hole 101 by demagnetization, but the second pin 105 does not push into the first hole because it has already rotated from the first hole.

Each cam rotates together with the rotation of the driven shaft, and first cam 111 operates switch LS ₆ .
This switch rotates the arm 30 of the sizing device to release the sizing bar 32 and removes the sorting chute 86 of the ejector from the fixed chute 86. In this way, the end portion of the old bar material left uncut by the clamping device is gradually pushed down from the clamping device C by the new bar material being fed at a constant speed, and is collected into a residual material container or the like through the fixed chute. Ru. after that,
When a new bar is fed a preset length,
A second cam 112 actuates switch LS ₇ , which stops the constant speed feed of the hydraulic motor. With this stoppage, the control valve 24 of the clamping device C shown in FIG. 2 is operated to grip and fix the bar, and then the cylinder 38 of the sawing device E shown in FIG. 3 is lowered to lower the saw blade. cuts off the starting end of the bar. This cutting length can be appropriately set by appropriately adjusting the position of the second cam with respect to the switch. The cut-off starting end passes through a fixed chute and is recovered in the same manner as the terminal end. When the cutting is completed, the saw device returns, the control valve of the clamp device switches to release the bar, and the hydraulic motor starts constant speed feeding.

After constant speed feeding starts and the driven shaft 94 rotates slightly, the third cam 113 operates the switch _LS8 . This switch positions the cylinder of the sizing device to return the sizing bar 32 to the product sizing position, and also operates the cylinder of the cut material discharge device F to align the sorting chute 86 with the fixed chute 85 to remove the product. Return to ejection position.

During a period of 360 degrees from the start of rotation of the driven shaft 93, each of the cams is operated, and when the driven shaft 93 rotates once at the top, the driven drum 98 returns to its original position shown in FIG. The switch LS ₃ is activated and the clutch electromagnet 10 is pushed into one end of the through hole 104.
0 is demagnetized, the driving drum 95 retreats, and the meshing of both drums is released. At the same time, the second pin 105 is urged by the spring 106 and pushes into the first hole 101, causing the driven drum 98 to stop suddenly. Therefore, the driven shaft 94 is accurately stopped at the initial position.

Finally, the sizing cutting operation control device H causes the bar material feeding device B, clamping device C, sizing device D, and saw device E to operate in coordination to perform sizing cutting on the bar material to obtain a desired length. It manufactures products,
Hydraulic motors, cylinders, etc. provided in each device are operated in conjunction with a limit switch, etc., and one embodiment thereof is constructed as shown in FIG. 8.

Next, to explain the operation, after the above-mentioned operation of cutting off the starting end of the bar is completed, the feeding device B
The hydraulic motor BM continues to feed at a constant speed, and the bar material comes into contact with the sizing bar of the sizing device D. As a result of this contact, in Fig. 8, the limit switch LSd of the sizing device is activated, the motor of the feeding device is stopped, the two-way control valve 24 of the clamp device C performs a clamping operation, and the sizing of the bar material is performed. will be implemented. After the clamping is completed, the sequence valve SV built into the clamping device is activated, and cylinder 3 of the saw device E is activated.
8 descends and cuts to size. The products cut to size are discharged to a predetermined location via a fixed chute, a sorting chute, and a product chute. When the fixed size cutting is completed, for example, a cutting confirmation limit switch LSe built into the saw device is activated, the cylinder of the saw device returns to its original position, and the two-way control valve of the clamp device performs a clamp release operation. After the release is completed, the sequence valve is activated and the motor of the feeding device is operated to feed the bar again, bringing its tip into contact with the sizing bar. Thereafter, the above operation is repeated to continuously manufacture products by cutting to size.

When the end of the bar approaches the clamping device, the sixth
As shown by the solid line in the figure, the pusher 9 pushing the end of the bar pushes up the detector 90, which activates the bar end detection switch LS ₄ , which causes the motor of the feeder to operate in reverse as shown in Figure 8. let When the pusher returns to the rear end of the conveyor due to this reversal,
The return confirmation switch LSb installed there is activated, stops the motor, and operates the push-up cylinder Sa of the bar feeder. When the bar is fed onto the conveyor by the operation of this cylinder, the supply confirmation switch LSa installed on the conveyor is activated, and the above-mentioned cut-off operation control device G is then activated to cut the starting end of the bar. Then, cutting to size is performed as described above.

As described above, according to the automatic bar cutting saw device according to the present embodiment, a desired product can be automatically manufactured by continuously cutting a bar to a specified size, and both ends of the bar that are inappropriate for the product can be cut. Can be automatically truncated.

As explained above, in the present invention, the driven shaft is stopped relative to the frame by inserting one end of the second pin inserted into the through hole formed in the driven shaft into the first hole formed in the frame. ,Also,
The first pin inserted into the first hole pushes out the second pin to release the inserted state, and the second pin pushes a third pin arranged on the frame to operate the switch and excite the clutch electromagnet. Since the driven shaft and the driving shaft are connected to each other, the driven shaft can always be stopped at a constant position with respect to the frame.

In the above embodiment, the case where the present invention is applied to an automatic bar cutting saw device has been described, but the present invention can also be applied to other technical fields.

[Brief explanation of the drawing]

1 to 8 show an embodiment of the present invention, in which FIG. 1 is an overall perspective view of an automatic bar cutting device, FIG. 2 is a right sectional view of a clamping device, and FIG.
A right side view of the saw device for non-ferrous metals, Fig. 4 is a plan cross-sectional view taken along the - line in Fig. 3, and Fig. 5 is a - in Fig. 4.
6 is a schematic front view of the bar end detection device, FIG. 7 is a plan sectional view of the truncated length determining device, and FIG. 8 is a block diagram of the sizing cutting operation control device. be. A...Bar material feeding device, B...Bar material feeding device, C
...Clamp device, D...Sizing device, E...Iron,
Non-ferrous saw device, F...Cut material discharge device, G...
Starting end truncation operation control device, H... Continuous cutting operation control device, I... Bar end detection device, J... Sizing cutting operation control device, K... Electromagnetic clutch, 4... Bar stock, 6... Roller conveyor, 9... Pushya, 1
0...Sprocket, 15...Base, 16...
Reception block, 17... Secondary cylinder, 22... Primary cylinder, 24... Control valve, 27... Pressure regulating valve, 32... Sizing bar, 36... Frame, 38
... Cylinder, 43 ... Saw blade, 47 ... Turntable, 49 ... Motor, 51 ... Driving pulley, 52 ... Saw blade shaft, 53 ... Wheel shaft, 54
... Worm shaft, 55 ... Gear shaft, 57 ... First
Driven pulley, 58, 80... Belt, 71...
Spline, 72... Worm, 74... Slider rod, 78... Wheel, 79... Second driven pulley, 86... Sorting chute, 90... Detector, 91... Cam, 92... Driving shaft, 93... ... Frame, 94 ... Driven shaft, 95 ... Driving drum,
98... Driven drum, 100... Clutch electromagnet, 101... First hole, 102... First pin, 1
03...Electromagnet, 104...Through hole, 105...
Second pin, 106...Spring, 107...Second hole, 108...Third pin, 110...Spring, 111-113...Cam.

Claims (1)

[Claims for Utility Model Registration] 1. An electromagnetic clutch comprising a frame, and a driving shaft and a driven shaft that are each rotatably supported by the frame and are connected and disconnected from each other by excitation and demagnetization of a clutch electromagnet. A first hole is formed in the radial direction of the driven shaft, facing the driven shaft, and a first hole that reciprocates in this hole is formed in the driven shaft.
Insert a pin into the first through hole in the driven shaft.
A second pin is formed diametrically opposite to the hole and has a length substantially equal to that of the through hole, and one end of the second pin is inserted into the first hole so as to be freely removable and removable. A third pin is disposed at a position facing the driven shaft in the hole so as to be freely removable and removable at the opposite end of the through hole, and the third pin is provided with a switch that excites and demagnetizes the clutch electromagnet by the movement of the third pin in and out. An electromagnetic clutch characterized by interlocking. 2. The electromagnetic clutch according to claim 1, wherein the first pin reciprocates by excitation and demagnetization of an electromagnet.