JPS6344499B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention comprises two rotating grindstones that face each other with a gap between them, and a feed device that sequentially and continuously feeds a plurality of workpieces between the two grindstones. , relates to a double-headed surface grinder that sequentially and continuously grinds a certain number of workpieces.

(Prior art) In this type of double-head surface grinding machine, especially in a through-yield grinding machine where the workpiece is passed continuously and linearly between the grinding wheels, the workpiece is fed between the grinding wheels and ground afterwards. It is pushed out by the supplied workpiece and is discharged to the discharge side. However, since the final workpiece will not be supplied later, it cannot be automatically discharged and will stop between the grinding wheels. Conventionally, the final workpiece that stops between the grinding wheels as described above has been manually ejected, for example, by an operator inserting a long push plate between the grinding wheels from the workpiece supply side.

However, when the final processed product is manually discharged, not only a discharge worker is required, but also the discharge operation is time-consuming and inefficient. In addition, the speed at which the final workpiece passes between the two grinding wheels, that is, the grinding feed rate, is no longer constant, and for example, the time that the final workpiece remains between the two grindstones becomes longer.
There is a very high probability that the final processed product will be defective, making it uneconomical.

(Object of the invention) The present invention provides a double-headed surface grinder that automatically passes a final workpiece between both grinding wheels at a constant speed,
By making it possible to discharge the grinder, the purpose is to improve the efficiency of the grinding work, improve the yield of the final workpiece, and enable complete automation.

(Structure of the Invention) Two rotating grindstones 1 facing each other with an interval are provided, and a belt feeding device 12 is provided in order from the side of the rotating grindstones 1.
and a shooter 13 are arranged, and a plurality of workpieces are sequentially and continuously conveyed from the shooter 13 to the belt feeding device 1.
In the double-head surface grinding machine, a final workpiece detection device is provided to detect the supply of the final workpiece to the shooter 13, and the shooter 13 is arranged at an angle so that the side of the belt feeding device 12 is lowered. It also has a pair of left and right vertical side plates 23 and a bottom plate 24, and the bottom plate 24 is connected to a lifting cylinder 28.
A drum 54 is provided on the side opposite to the belt feeding device side of the shooter 13 so that it can be freely opened downwardly, and a belt-shaped workpiece discharge member 55 is wound around the drum 54, and the belt-shaped workpiece is processed by the rotation of the drum 54. The tip of the object discharge member 55 is freely extended toward the grinding wheel, and the final workpiece detection device is connected to the drive device of the rotating drum 54 and the cylinder 28 for raising and lowering the bottom plate of the shooter 13, so that when the final workpiece is detected, the bottom plate 24 opens downward and the drum 54 rotates so that the tip of the workpiece discharge member 55 passes at a constant speed between the side plates 23 of the shooter and between the belt feeding device 12 and is inserted between the grinding wheels. There is.

(Example) In FIG. 1 showing a plan view of a double-headed surface grinder to which the present invention is applied, a pair of disc-shaped rotary grindstones 1 are arranged to face each other with a gap between them, and
Each is fixed to the grindstone holder 2. Each grindstone holder 2 is fixed to a rotating shaft 3, respectively. Both rotating shafts 3 are arranged horizontally and aligned with each other on the same axis. Each rotating shaft 3 has a slide creel (not shown) in the grinding wheel head 5.
The main motor 7 is rotatably supported by the main motor 7 via a belt transmission mechanism 6. The belt transmission mechanism 6 and the rotating shaft 3 are interlocked and connected by spline fitting. In other words, both grinding wheels 1 and both motors 7
As a result of the rotation, the parts rotate around the same horizontal axis at, for example, the same rotational speed. Each of the slide grilles is supported by a grinding wheel head 5 so as to be movable and adjustable in the direction of the rotation axis, and is moved by a feed screw (not shown) that is rotated by the operation of a head cutting handle 10, a head cutting motor 11, etc. Can be adjusted.

As a workpiece feed device, a belt feed device 12, a shooter 13, and a pusher cylinder 14 are arranged in this order from the grindstone 1 side. The belt feeding device 12 includes a driving pulley 15 and a driven pulley 16.
The pulley sets 15 and 16 are arranged on both sides of the workpiece path, and a V-belt 17 is wound around each pulley set. Both drive pulleys 15 are designed to rotate in opposite directions, and rotate in the directions of arrows F and F', respectively, during grinding work, for example.

In FIG. 2, a plurality of V-belts 17 are wound around a pair of pulleys 15 and 16. Either one of the drive pulleys 15 is, for example, the drive shaft 1
9, connected to the feed drive motor 22 via the gear 20, worm 21, etc., and the remaining drive pulley 1
5 is a feed drive motor 22 via a reversing mechanism, for example.
It is linked to. Further, a transmission device (not shown) is interposed between the drive motor 22 and the drive pulley 15, so that the rotational speed of the drive pulley 15 can be adjusted.

The shooter 13 includes a pair of vertical side plates 23 disposed on both sides of the workpiece passage and a bottom plate 24, and is inclined so that the end on the workpiece feed direction A side is lower than the other end. ing. The end of the bottom plate 24 in the direction A is rotatably supported by a bracket 26 via a horizontal hinge pin 25, and the middle part of the bottom plate 24 is pivotally connected to a rod 28a of a cylinder 28 for lifting and lowering the bottom plate. There is. cylinder 2
8 is connected to the bracket 26 via a horizontal support pin 30.
The bracket 26 is fixed to the support base 8.

The pusher cylinder 14 is supported by a stopper frame 37 via a bracket 31, and a pusher plate 33 is integrally provided on the rod 14a of the cylinder 14. The edge of the pusher plate 33 on the arrow A side is formed into a partially arcuate shape. The pusher plate 33 is
It is disposed in the same vertical plane as the workpiece path formed between the two shutter side plates 23, and is integrally provided with a pair of guide rods 34. The guide rod 34 is arranged parallel to the shooter 13 and is slidably supported by the guide tube 35. The guide tube 35 is fixed to the bracket 31.

In FIG. 3, a workpiece stopper 36 is supported by the feed box 32 via a stopper frame 37. A workpiece magazine 38 is arranged on the horizontal extension of the stopper 36, and the magazine 38 is supported by a magazine stand 40 via a bracket 39. The magazine 38 extends close to the stopper surface 36a of the stopper 36, and forms a slit outlet S with a width through which the workpiece W and the pusher plate 33 can pass between the magazine 38 and the stopper surface 36a.

Reference numeral 42 denotes a magazine pusher plate, which is supported by an air cylinder 43 so as to be movable up and down. Air cylinder 43 is slider 44
The slider 44 is fixed to the magazine 3.
It is supported by two guide rails 45 parallel to 8 so as to be movable in the rail length direction, and can be moved at a constant speed in the direction of arrow B by an appropriate drive device. The rail 45 is supported by the magazine stand 40 via a suspension stand 46 and a support arm 47. As shown in FIG. 4, the magazine 38 has a pentagonal cross-section that opens upward.

The final workpiece detection device for detecting the supply of the final workpiece W' includes, for example, as shown in FIG. A detection switch mechanism 51 for detection is provided. The counter 50 is fixed to the bracket 31 and is attached to the rear end flange 34a of the rod 34.
The flange portion 34a comes into contact with the cylinder 14 when the cylinder 14 is expanded. The number of workpieces W stored in the magazine 38 is preset in the detection switch mechanism 51, and when the counter 50 counts the final workpiece W', the switch mechanism 51 is turned on, and the number of workpieces W stored in the magazine 38 is set in advance. (Fig. 2) is lowered. A limit switch 52 for starting the discharge device is arranged below the shooter bottom plate 24.

The final workpiece discharge device 53 (FIG. 3) includes a rotating drum 54, a band-shaped steel belt 55 wound around the drum 54, a pair of feed rollers 56, and the like. The drum 54 is fixed to a vertical drive shaft 57, and the drive shaft 57 is connected to the feed box 32.
The first chain transmission device 58, the reduction gear 59, the second chain transmission device 60
and a drive motor 6 for the discharge device via a transmission 61
It is linked to 2. Also, the feed roller 56
are each fixed to a vertical rotating shaft 63, and both rotating shafts 63 are interlocked and connected to each other via a pair of gear sets 64, and one rotating shaft 63 is connected to the reducer 5.
It is linked to 9. Reference numeral 66 is a speed change handle that adjusts the speed ratio and allows the workpiece discharge speed to be changed as necessary. The drive motor 62 for the discharge device is connected to the limit switch 52 of the shooter bottom plate 24 (FIG. 2).
When the switch 52 is turned ON, it is activated to rotate the drum 54 in the direction of arrow D in FIG.
Rotate in the E′ direction. The tip end 55a of the steel belt 55 is aligned in the same vertical plane as the workpiece path between the shooter side plates 23, passes between both feed rollers 56, and reaches the bottom plate 24 as shown in FIG.
It extends to a position where it does not interfere with the

Reference numeral 72 in FIG. 2 is a photoelectric stroke end detection mechanism, which is connected to the ejection device drive motor 62 and the feed drive motor 22, and is connected to the belt 55.
When the stroke end hole 73 formed in the middle is detected, the drive motors 62, 22 are switched to the reverse direction, and the drum 54 and roller 56 in FIG. By rotating the belt 55 in the opposite direction, the belt 55 is wound back to the state shown in FIG. When the stroke end hole 73 reaches the position of the detection mechanism 72, the belt 55
The tip end 55a passes between both grindstones 1 in FIG. 1 and extends to the workpiece discharge side.

Although not shown, workpiece guide plates are provided above and below the workpiece passage within the grinding machine.

(Function) Before starting the work, the bottom plate 24 of the shooter 13 is in a raised state as shown in FIG. He is retreating to the side.

The magazine 38 (FIG. 3) contains a predetermined number of e.g.
700 ring-shaped workpieces W are stored,
It is pressed toward the stopper 36 by a magazine pusher plate 42. Further, the detection switch mechanism 51 is set to be turned on when the counter 50 counts the 700th sheet.

When the grinding machine is started, the pusher cylinder 14 shown in FIG. 2 is activated, and the workpieces W are pushed out one by one to the shooter 13. The workpiece W rolling in the direction of arrow A in the shooter 13 is transported by the feed belt device 1
2 into the grinding machine, and both grinding wheels 1 grind both sides. The ground workpiece W is pushed out to the discharge side by a workpiece W sent later. During the grinding operation, the magazine pusher plate 42 (FIG. 3) moves in the direction of arrow B as the workpiece W in the magazine 38 decreases, and maintains the state in which the workpiece W is pressed against the stopper 36. .

The pusher cylinder 14 pushes the final workpiece W' into the shooter 13, and the counter 50
When the 700th sheet is counted, the switch mechanism 51 is activated to retract the bottom plate lifting cylinder 28 (FIG. 2) and lower the end of the bottom plate 24 on the side of the reverse arrow A. When the bottom plate 24 descends until it becomes horizontal,
The limit switch 52 is turned on, and the discharge device drive motor 62 begins to rotate.

Due to the rotation of the drive motor 62, the drum 54 and feed roller 56 in FIG. Protrude between the two grindstones,
The final workpiece W' is discharged from between both grinding wheels 1 at a constant speed.

When the belt 55 extends to the discharge side and reaches the stroke end, the stroke end detection device 72 detects the end hole 73 of the belt 55, and the drum 54 and feed roller 56 rotate in the opposite direction, causing the belt 55 to move as shown in FIG. Rewind to the state.

(Another Embodiment) (1) As the final workpiece discharge member, instead of the steel belt 55 shown in FIG. 1, a strip of MC nylon or a strip of ultra-high molecular polyethylene may be used. However, it is preferable that the material has a suitable hardness so that the final workpiece can be extruded.

(2) As a final workpiece detection device, instead of the counter 50 and switch mechanism 51 in FIG. 3, for example, a limit switch 80 is installed at the end of the guide rail 45 on the arrow B side in FIG.
may be provided so that the cylinder 43 contacts the limit switch 80 at the same time as the pusher plate 42 contacts the stopper surface 36a, thereby starting the drum 54 and the like.

(3) Although the illustrated embodiment is a surface grinder with opposed horizontal axes, it can also be implemented on a surface grinder with opposed vertical axes.

(Effects of the invention) (1) Final workpiece detection device, e.g. counter 50
and a detection switch mechanism 51, and a final workpiece discharge device 53 having a discharge member such as a steel belt 55, and when the detection device detects the supply of the final workpiece, the discharge device 53 is activated and discharges the final workpiece. Since it is pushed and discharged at a constant speed, the final workpiece can be automatically discharged, eliminating the need to manually discharge the final workpiece as in the past, improving the efficiency of grinding work. do. In other words, complete automation of work can be achieved.

(2) Since the final workpiece is extruded at a constant speed, the yield of the final workpiece is improved. That is, the grinding accuracy of the workpiece from the beginning to the end is maintained at a high and constant level, and no defective products occur.

(3) As a final workpiece discharge device, a drum 54 is provided on the workpiece supply side so as to be freely rotatable.
A belt-shaped workpiece discharge member 55 is wound around the belt-shaped workpiece discharge member 5 by rotation of the drum 54.
Since the tip of the grinder 5 can freely extend from the workpiece supply side to the workpiece discharge side through between both grinding wheels at a constant speed, the final workpiece discharge device 53 and the entire surface grinder can be made compact. can.

That is, as the final workpiece discharge device, it is only necessary to arrange the drum 54 etc. only on the workpiece supply side.
Moreover, since the workpiece discharge member 55 is wound around the drum during grinding work until the final workpiece is supplied, there is no need to arrange various discharge parts on the workpiece discharge side or under the rotary grindstone. It's over.
Therefore, the installation space for the final workpiece discharge device is extremely small, and the final workpiece discharge device and the entire grinding machine can be made compact, and the work of installing the discharge device does not require much effort.

(4) Since the final workpiece is discharged at the tip of the belt-shaped workpiece discharge member 55, even if the gap between the grinding wheels is narrow when grinding a thin workpiece, the final workpiece discharge member can be easily removed. It can extend between the grinding wheels.

That is, it is extremely effective when grinding thin workpieces.

(5) The inclined shooter 13 is composed of a pair of left and right vertical side plates 23 and a bottom plate 24.
can be opened downward by the lifting cylinder 28, and is opened when the final workpiece is detected, so that the belt-shaped workpiece discharge member 5
5 is guided between the side plates 23 of the shooter 13, enters between the belt feeding device 12, and is inserted between the grindstones 1.

That is, for compactness, a belt-shaped discharge member 55 is provided that is wrapped around the drum, but by opening the shooter bottom plate 24, the side plates 23 can be used as guides.
Even if it is a belt-shaped discharge member, it can be reliably inserted into the belt feeding device 12 and projected between the grindstones 1. This is particularly effective when processing thin workpieces.

[Brief explanation of the drawing]

Figure 1 is a plan view of a double-head surface grinder to which the present invention is applied, Figure 2 is an enlarged view of Figure 1 in the direction of the arrows, Figure 3 is a view of Figure 1 in the direction of the arrows, and Figure 4 is the view of - It is a cross-sectional view. 1... Grindstone, 12, 13, 14... Belt feeding device, shooter, pusher cylinder (feed device), 50, 51... Counter,
Detection switch mechanism (an example of a final workpiece detection device),
53...Final workpiece discharge device, 55...Steel belt (an example of discharge member).

Claims (1)

[Claims] 1 comprises two rotating grindstones 1 facing each other with a gap between them, and a belt feeding device 1 in order from the side of the rotating grindstones 1.
2 and a shooter 13 are arranged, and a plurality of workpieces are sequentially and continuously supplied from the shooter 13 to the belt feeding device 12 between both grinding wheels, and the supply of the final workpiece to the shooter 13 is detected. The shooter 13 is arranged at an angle so that the side of the belt feeding device 12 is lowered, and has a pair of left and right vertical side plates 23 and a bottom plate 24, and the bottom plate 24 is connected to the lifting cylinder 2.
A drum 54 is provided on the side opposite to the belt feeding device side of the shooter 13 so that it can be freely opened downward by the shutter 8, and a belt-shaped workpiece discharge member 55 is wound around the drum 54. The tip of the workpiece discharge member 55 is freely extended toward the grinding wheel, and the final workpiece detection device is connected to the drive device of the rotating drum 54 and the cylinder 28 for raising and lowering the bottom plate of the shooter 13, so that when the final workpiece is detected, the bottom plate is 24 opens downward and the drum 54
is rotated so that the tip of the workpiece discharge member 55 passes at a constant speed between the side plates 23 of the shooter and between the belt feeding device 12 and is inserted between the grinding wheels. Board.