JPH0741445B2 - Material tip detection mechanism for short cuts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a material tip detection mechanism for a shortcut (hereinafter,
More specifically, the present invention relates to a material tip detecting mechanism for short-cutting an unusable tip of a material (bar) supplied by a bar feeder (hereinafter simply referred to as a feeder).

(Prior Art) A conventional tip detection mechanism 50 is configured as shown in FIGS. 4 and 5, for example. That is, the tip of the upward projecting plate 56b of the slider 56 slidably arranged on the guide lot 58 of the lever 62 projects into the slot 54 provided below the guide pipe (which may be a guide rail) 52. I am letting you. The lever 62 is attached so as to be rotatable around a fulcrum 62b. A solenoid 64 is provided, and the operating protrusion 66 of the solenoid 64 is a lever at a fulcrum 68.
62 is connected to a rod 62a (the rod 62a projects from the lever 62 so as to be on the line connecting the fulcrum 62b and the fulcrum 68). A spring 60 is provided between the lower protrusion 56a of the slider 56 and the adjustment type fixing point 74, and biases the lever 62 counterclockwise in the tip end detection state as shown in FIG. . Further, the limit switch 70 is arranged such that the operating roller 72 thereof can come into contact with the rod 62a of the lever 62. In addition,
A stopper 58a for limiting sliding of the slider 56 is provided at the tip of the rod 58.

Now, the rod 42 moves in the direction of the arrow in the guide pipe 52, hits the tip of the upward projecting plate 56b of the slider 56 in the tip detection state shown in FIG. 4, and pushes this tip to the right. Become. At this time, first, the slider 56 is slid rightward on the guide rod 58 against the action of the spring 60. Eventually the slider 56 will become the lower guide plate 56.
It deviates from c and is rotated clockwise about the fulcrum 62b in a moment. That is, the slider 56 falls as shown in FIG. 5, the upward projecting plate 56b falls apart from the bar 42, and the rod 62a of the lever 62 is moved by the limit switch 7b.
The operating roller of 0 is pushed to generate a signal for detecting the tip of the rod 42.

In order to return the state of FIG. 5 to the state of detecting the front end of FIG. 4, the solenoid 64 is biased so that its operating projection 66 is retracted and the lever 62 is rotated counterclockwise.

(Problems to be Solved by the Invention) In such a configuration of the related art, it is necessary to supply electric power for energizing an electric component such as a solenoid. Further, as is apparent from the drawings, the structure is complicated, and the point that the rod material contacts the slider when rotating the slider due to the size of the rod material, the shape of the tip of the rod material, etc. It has a drawback that precise tip detection cannot be performed because the timing of the movement of is different.

Therefore, an object of the present invention is to provide a material tip detection mechanism for a shortcut, which has a relatively simple structure and can perform more accurate tip detection.

(Means for Solving the Problems) In order to achieve the above-mentioned object, according to the present invention, a guide rail for a bar and a material for a feeder provided above the guide rail for the bar are provided. A push-down cam fixed to the take-out shaft, a lever that is rotated by the push-down cam, and a lever that is provided on the lever and projects into the guide rail when the lever takes a lower position and the guide when the lever takes an upper position. A primary stop stopper portion that is separated from the rail, and is rotatably provided on the upstream side of the primary stop stopper portion so as to project into the guide rail when the lever is in the lower position and the lever when the lever is in the upper position. It is characterized by having a material tip detection lever which is separated from the guide rail and a limit switch which is operated by the rotation of the material tip detection lever. A material cutting edge detection mechanism is provided.

Similarly, a bar stop guide rail, a primary stop stopper movably mounted between an upper position separated from the guide rail and a lower position protruding into the guide rail, and the primary stop stopper. A detection lever, which is arranged upstream of the stopper, is movably attached between the upper position and the lower position together with the primary stop stopper, and is rotatably attached, and a limit switch operated by the rotation of the detection lever. A means for driving the primary stop stopper and the detection lever between an upper position and a lower position,
There is also provided a material tip detecting mechanism for a shortcut, which has:

(Example) Next, this invention is demonstrated with reference to drawings. 1 and 2 are perspective views showing the tip detecting mechanism of the present invention, and FIG. 3 is a schematic side view of a material feeder using the tip detecting mechanism of the present invention.

1 and 2, the tip detecting mechanism 10 of the present invention is shown.
Has a bracket 16 attached to the frame 14 of the feeder. A bearing 18 is attached to the bracket 16,
The material take-out shaft 12 of the material feeder is rotatably supported by the bearing 18. The take-out shaft 12 rotates a supply disc (not shown) for supplying the bar stocks stacked on the supply shelf 102 (see FIG. 3) to the guide rails 20 one by one. (Not shown) is attached. Further, the bracket 16 is provided with a substantially square through hole 16a, and the guide rail 20 is arranged so as to penetrate the through hole 16a.

A push-down cam 34 and a cam boss 28 are fixed to the take-out shaft 12 described above. The left end of the cam boss 28 has a truncated conical tapered cam surface 28a. A spring 22 has one end fixed to the bracket 16 and connected to the tip of a movable lever 36 so that the lever 36 contacts the cam 34.

A lever 36 is attached to the bracket 16 so as to be rotatable about a fulcrum 44. When the lever 36 is pushed down by a push-down cam 34, the lever 36 is turned to a position shown in FIG. It The lever 36 is integrally formed with a stopper portion (or stopper) 32 for primary stop of the material tip. The lever 36 is further provided with a bracket 46 having a rectangular ring shape but a part of which is notched. The tip detecting lever 26 of the material (bar material) is rotatable around the fulcrum 30 on the bracket 46. Installed on. The tip detecting lever 26 has a rounded upper portion to form a cam R surface that engages with the cam surface 28a of the cam boss 28, and the spring 24 has the tip 24.
It is provided between the upper part of the bracket and the base side of the bracket 26, and biases the tip detection lever 26 so as to rotate clockwise around the fulcrum 30.

As shown in FIG. 1, when the push-down cam 34 is in the upper position, the lever 36 is in the upper position, and the tips of the primary stop stopper portion 32 and the tip detection lever 26 are separated from the guide rail 20. . In this state, the R surface 26b of the leading end detection lever 26 is engaged with the central portion of the cam surface 28a of the cam boss 28, and the leading end detection lever 26 is in a substantially vertical posture.
Therefore, the tip detection lever 26 is separated from the operating protrusion 40 of the limit switch 38.

Further, as shown in FIG. 2, when the push-down cam 34 is rotated downward in accordance with the rotation of the take-out shaft 12 as indicated by the arrow (a), the lever 36 is rotated to perform the primary stop. The stopper portion 32 and the tip detection lever 26 project into the guide rail 20 and are in a position where they come into contact with the tip of the advancing bar 42. Also, the R surface of the tip detection lever 26 is separated from the cam surface 28a of the cam boss 28, so that the tip detection lever 26 has a fulcrum 30.
Is in a tilted position in which it is rotated clockwise as shown by an arrow (d) and abuts against the operating projection 40 of the limit switch 38 to operate. When the take-out shaft 12 returns from the state shown in FIG. 2 to the state shown in FIG. 1 by the action of the spring 22, the R of the tip detection lever 26 is changed.
The surface 26b is guided by the cam surface 28a of the cam boss 28 and rotated as shown by an arrow (c).

Next, with reference to FIG. 3, description will be given of a material feeder incorporating the tip detecting mechanism of the present invention.

The tip detection mechanism 10 is attached to almost the tip of the feeder 100. The bar 42 stored in the supply shelf 102 is configured to be introduced into the guide rail via a supply disc (not shown). An endless chain 108 is hung on a plurality of sprockets 110, and a motor (not shown)
It is driven by a shaft 112 and is moved in a tomb. A feed bar 104 having a finger chuck 106 attached to the tip thereof is attached to a part of the endless chain 108,
The bar 42 is configured so that its rear end is pushed by the feeding bar toward the automatic lathe spindle. Motor shaft 11
2 is also connected via a shortcut clutch to a shortcut device 114, which also includes a speed reducer. The length to be shortcut is adjusted by the attachment position of the shortcut weight 122 attached to the chain 120 configured to move upward when the shortcut clutch is actuated. The balance weight 118 is attached to the opposite side of the chain 120.

The shortcut clutch 116 is turned on by a signal issued by a control unit (not shown) after the rod 42 is stopped by the primary stop stopper portion 32, and when the shortcut clutch 116 operates, the chain 120 is wound up. As a result, a limit switch (not shown) that is activated when the shortcut weight 122 reaches the upper part is attached to the lower part of the shortcut device 114, and when the limit switch operates, the feeding of the bar is stopped.

A cut-off bite 126 is provided in front of the automatic lathe spindle 124, and shortcuts the shortcut feed amount from the shortcut feed amount.

Next, the operation of the tip detecting mechanism of the present invention will be described with reference to FIGS.

Now, when the take-out shaft 12 rotates in the direction of the arrow (a), the push-down cam 34 rotates downward, and the lever 36 rotates from the upper position to the lower position. Therefore, the primary stop stopper portion 32 and the tip detection lever 26 rotate downward together with the lever 36 and enter the guide rail 20. At this time, the tip detection lever
The R of the reference numeral 26 slides on the cam surface 28a of the cam boss 28 while the R surface thereof rotates in the direction of the arrow (d) by the action of the spring 24, and is disengaged from the cam surface 28a.
Abutting on the operating protrusion 40 of, and further pressing the operating protrusion 40,
As shown in FIG. 2, it stops in the inclined state. This prepares to detect the tip of the rod 42.

Next, the rod 42 fed into the guide rail 42 is fed by the feed arrow 10.
It is sent toward the automatic lathe by 6 and its tip hits the contact portion 26a at the lower end of the tip detecting lever 26 protruding into the guide rail, and further advances while pushing against the action of the spring 24. Therefore, the tip detection lever 26 rotates counterclockwise about the fulcrum 30 as shown by the arrow (c),
The limit switch 38 moves away from the operating protrusion 40. At this time, the limit switch 38 generates a signal, and this signal is sent to a control unit (not shown), and the control unit controls the bar member to decelerate and send it to the stopper part for primary stop and Corresponding to the distance from the time of occurrence to the stopper for primary stop, advance by a preset pulse signal amount to stop at stopper 32 to stop and put a shortcut clutch, so a signal is sent to stop feeding and this device guides. Stand by to retract from the rails 20.

After that, the take-out shaft 12 is rotated in the direction of the arrow (b),
The push-down cam 34 is rotated upward, and the lever 36 is rotated from the lower position to the upper position. At this time, the tip detection lever 26
R surface 26b of the boss rests on the cam surface 28a of the cam boss 28 and is guided by the cam surface 28a to assume the vertical position shown in FIG.

After the primary stop stopper 32 is raised, the shortcut clutch 116 shown in FIG. 3 is turned on to operate to feed a bar material through the automatic lathe spindle for a preset length, and when the preset length is fed, the limit is reached. The shortcut weight 122 operates a switch (not shown), and the feed of the bar is stopped by the signal of the limit switch.

(Effects of the Invention) As described in detail above, according to the present invention, in addition to the tip detection lever, the primary stop lever for stopping the rod at one set position is provided, so that accurate position control is performed. In addition, it is possible to obtain a tip detection mechanism having a relatively simple structure.

[Brief description of drawings]

FIG. 1 is an inclined view showing the tip detecting mechanism of the present invention, FIG. 2 is a perspective view similar to FIG. 1, and FIG. 3 is a schematic side view of a material supply machine using the tip detecting mechanism of the present invention. 4 and 5 are side views showing a conventional tip detecting mechanism, and FIG. 5 is a side view similar to FIG. 10 …… Tip detection mechanism, 12 …… Take-out shaft, 20 …… Guide rail, 36 …… Lever, 32 …… Stopper part for primary stop, 26 …… Tip detection lever, 28 …… Cam boss, 42 …… Bar , 100 …… Feeder, 108 …… Endless chain, 116
…… Shortcut clutch, 126 …… Partially bite.

Claims (7)

[Claims] 1. A bar guide rail, a push-down cam fixed to a material take-out shaft of a feeder provided above the bar guide rail, and a lever rotated by the push-down cam. A primary stop stopper portion that is provided on the lever and that projects into the guide rail when the lever takes a lower position and separates from the guide rail when the lever takes an upper position; and an upstream side of the primary stop stopper portion. A material tip detection lever that is rotatably provided and projects into the guide rail when the lever takes a lower position and separates from the guide rail when the lever takes an upper position, and operates by turning the material tip detection lever. Limit switch, and a material tip detection mechanism for a shortcut. 2. A cam boss having a frustoconical taper cam surface is fixed to the take-out shaft, and a cam R surface slidably engaged with the frustoconical taper cam surface has an upper portion of the detection lever. The detection lever is rotated to engage with or separate from the actuating projection member of the limit switch when the lever moves between an upper position and a lower position. The material tip detection mechanism for shortcut according to the item 1). 3. The shortcut material tip detection according to claim 1, wherein the detection lever is urged by a spring in a direction in which the detection lever engages with the operating projection of the limit switch. mechanism. 4. A bar stop guide rail, a primary stop stopper movably mounted between an upper position separated from the guide rail and a lower position protruding into the guide rail, and the primary stop stopper. A detection lever, which is arranged upstream of the stopper, is movably attached between the upper position and the lower position together with the stopper for primary stop, and is rotatably attached, and a limit switch operated by the rotation of the detection lever. A means for driving the primary stop stopper and the detection lever between an upper position and a lower position, and a material tip detecting mechanism for a shortcut. 5. The drive means comprises a push-down cam fixed to a material take-out shaft of a material feeder, and a lever which is rotated by the push-down cam and which is provided with the primary stop stopper and a detection lever. The material tip detecting mechanism for a shortcut according to claim (4), which is characterized. 6. A cam boss having a frustoconical taper cam surface is fixed to the take-out shaft, and a cam R surface slidably engaged with the frustoconical taper cam surface is an upper portion of the detection lever. And the engaging lever is engaged with or separated from the actuating projection member of the rotated limit switch when the lever moves between an upper position and a lower position. The material tip detection mechanism for shortcut according to the item 4). 7. The shortcut material tip detection according to claim 4, wherein the detection lever is biased by a spring in a direction in which the detection lever is engaged with the operating projection of the limit switch. mechanism.