JPH0378203B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a material feeding device that supplies bar material to an automatic lathe such as a fixed-spindle automatic lathe or a moving-spindle automatic lathe, and in particular, The present invention relates to a material feeding device with a movement confirmation device.

(Prior Art) A material feeding device is configured to send a bar material to an automatic lathe side during product processing in a bar processing machine, for example, an automatic lathe, each time a part is processed. To explain more specifically with reference to FIG. 1, the bar 2 is held by being inserted into the finger chuck 5 provided at the tip of the feeding arrow 4 of the material feeding device 3, and is constantly held in the bar processing machine. It is pressed to the 1 side. When machining one part is finished, for example, in the case of a spindle relocation type automatic lathe, the movement of the bar is suppressed using a parting tool, the collect chuck is opened, the main spindle is retracted, the collect chuck is closed, and the bar is gripped. After that, the bar is advanced by advancing the main shaft by a predetermined length L (length dimension of the part processed by the bar processing machine),
Start machining the next part. Since the feed arrow always presses the bar toward the bar processing machine, it also moves forward by a length L when the main shaft moves forward.

(Problem to be Solved by the Invention) However, if the feed arrow 4 gets caught on the guide rail of the material feeding device 3, the feed arrow 4 moves only by a length _l1 , which is shorter than the length L it should originally move. There are things I don't do. In such a case, a fixed spindle type automatic lathe will process a product with defective dimensions, and a moving spindle type automatic lathe will process a product with defective dimensions, and in the worst case, the tool will is damaged.

Furthermore, if for some reason, such as the bar becoming detached from the feed arrow, the feed arrow 4 moves a distance _l2 greater than the length L that it should normally move, the material and the feed arrow may come into contact, causing trouble. .

Therefore, an object of the present invention is to detect a feeding abnormality by detecting when the feed arrow of a material feeding device is fed shorter or longer than a predetermined movement setting amount. An object of the present invention is to provide a material feeding device with a device.

(Means for Solving the Problems) In order to achieve the object of the present invention, in a material feeding device that feeds bars to an automatic lathe, the amount of movement of the feed arrow is counted from the time when the feed arrow starts moving, and the feed arrow is a counter that outputs a signal with a preset value shorter than the preset amount of movement; a timer that is set to operate after the time required for the feed arrow to move by the preset value or more; and the counter outputs a signal based on the preset value. There is provided a material feeding device with a device for confirming movement of a feed arrow by a certain amount, comprising: a device for detecting feeding abnormality by sensing that the timer is activated before the feed arrow is moved by a certain amount.

In addition, in a material feeding device for feeding bars to an automatic lathe, a counter that counts the amount of movement of the feed arrow from the time when the feed arrow starts moving and outputs a signal at a preset value longer than the set amount of movement of the feed arrow; There is provided a material feeding device for confirming movement of a feed arrow by a certain amount, comprising: a device for detecting feeding abnormality by sensing that the feed arrow outputs the preset value;

(Function) When the feed arrow of the material feeding device moves after completing machining of the part, a counter counts the amount of movement. A preset value shorter and a preset value longer than a predetermined movement setting amount of the feed arrow are set in the counter. A timer is provided which activates the contact just before the collect chuck opens after the time normally required for the feed dart to travel to a short preset value and is configured to be energized when the counter begins counting. There is. Now, if the arrow is successfully sent, the timer activates (eg closes) its contacts after the counter has output a short preset value. However, if the arrow is not sent normally and is sent too short, the counter will not output a signal with a short preset value even when the timer contact is activated. The material feeding device senses this and detects a feeding abnormality. Furthermore, when the counter outputs a signal with a long preset value, it is also determined that there is a feeding abnormality.

(Example) Fig. 1 is a schematic diagram of a material feeding device and a bar processing machine,
FIG. 2 is a control circuit diagram of the material feeding device with the device for confirming movement of the feed arrow by a certain amount of the present invention.

The material feeding device of the present invention can be applied to either a moving spindle type automatic lathe or a fixed spindle type automatic lathe as a bar processing machine, but for convenience of explanation, a moving spindle type automatic lathe will be described as an example. The mechanical structure of the material feeding device and the bar processing machine has already been described in the section of the prior art. However, in the present invention, a rotary encoder (not shown) is provided on the shaft of a sprocket (not shown) in front of the chain 7 that pulls the blade 6 at the rear end of the feed arrow, so that the amount of movement of the feed arrow can be adjusted. It is constructed so that it can be obtained by counting the pulse signals output from this rotary encoder with a counter (FIG. 2c).

Now, one part is being processed by the bar processing machine 1 (spindle moving type automatic lathe), and when it is completed,
The parting tool 1a cuts the workpiece from the bar 2 and is held in the cutting position. Next, the collector chuck (not shown) opens, and the main shaft 1b retreats.
Close the collection chuck and grip the bar again.
The bar is always pressed toward the bar processing machine by the material feeder, but even if the collet chuck opens, the parting tool 1a suppresses the movement of the bar and keeps it in a fixed position. In addition, switch SW1 (Fig. 2 a) is closed by the opening operation of the collect chuck, and the counter (Fig. 2 c) is reset.
Make it ready for counting. Next, the main shaft 1b moves the bar forward by a length L (the length of the part to be machined). As the main shaft 1b moves, the feed arrow 4 also moves forward, and pulses corresponding to the amount of movement are sent from the rotary encoder to the counter and counted.

Next, with particular reference to FIG. 2, electrical control of the material feeding device of the present invention will be described.

(1) In normal operation When switch SW1 is closed by opening the collector chuck, relay CR1 is energized (line 1).
Also, timer TR1 is energized (line 2) to close normally open contacts CR1-1 and CR1-2 of relay CR1 (lines 2 and 3).

When the normally open contact CR1-1 closes, the timer's normally closed contact TR1-1 and the closed contact CR1-1 self-hold the relay CR1 (line 1) and also keep the timer energized. (line 2). In addition, normally closed contact TR1-1 of timer TR1
The opening operation of the normally open contact TR1-2 and the closing operation of the normally open contact TR1-2 are performed immediately before the collection chuck opens after the time normally required for the feed arrow to reach a length _l1 shorter than the set amount of movement L of the feed arrow. It is set so that Therefore, during normal operation, each contact of the timer operates after the normally open contact CNT1 of the counter, which will be described later, closes.

When the collector chuck closes at the backward position and the main shaft 1b begins to move forward, a pulse train indicating the amount of movement of the feed arrow is input from the rotary encoder to the counter, and the counter counts the number of pulses. Now, when the feed arrow moves by length l ₁ , the normally open contact of the counter
CNT1 closes (line 3), energizing relay CR2 (line 3) via its normally open contact CR1-2, which is already closed, and its normally open contact CR2-1 (line 4).
is closed and self-retained, and its normally closed contact CR2−
Open 2.

Before normally closed contact CR2-2 opens, the timer
Since normally open contacts TR1-2 of TR1 are open, relay CR4 is not energized (line 6).
Therefore, the normally open contacts which actuate the emergency stop control circuit (FIG. 2b) remain open.

Normally closed contact TR1-1 of timer TR1 is then opened, deenergizing relay CR1 and therefore also deenergizing relay CR2. During normal operation, the counter is
It does not close its normally open contact CNT2 (line 4) since it is reset by opening the collector chuck.

(2) In the case of a short feed abnormality, if the feed arrow is not sent normally and is sent short, for example l ₁ , relay CR1 will be activated as described above.
If the normally open contact TR1-1 of the timer TR1 closes after the normally open contact of the counter is closed (line 8), the relay CR5 is activated and the normally closed contact CR5-1 opens (line 2). ), and normally open contacts
TR1-2 closes (line 6). Therefore, relay CR1 is deenergized and relay CR2 is not activated. Therefore, the closed normally open contact TR1-2
and energizes relay CR4 through its normally closed contact CR2-2, which remains closed, and its normally open contact CR4-1.
is closed to maintain self-holding (line 7), and normally open contact CR4-2 is closed to activate the emergency stop control circuit.

(3) In the case of a long feed abnormality, if the feed arrow is not sent normally and is sent for a long time, such as l ₂ . Now, as before, when relay CR2 is closed and self-holding, before timer TR1 is deenergized and before the counter is reset, the counter counts the length of l ₂ and closes the normally open contact CNT2. (line 4). For this reason, the normally open contact CR2 is closed.
-1 and relay via closed normally open contact CNT2
CR3 is energized (line 4) and its normally open contact CR
3-1 is closed and self-retained. Also, relay CR
Since the normally open contact CR3-2 of No. 3 is also closed, the emergency stop control circuit is activated.

In the above embodiment, the timer is set immediately before the collect chuck, but if the length of the product to be processed is extremely short, the processing time for multiple products may be set as one unit. May be set.

(Effects of the Invention) As described above in detail, the present invention is characterized in that the material feeding device is provided with a device that detects feeding abnormality when the feeding arrow is fed shorter or longer than normal. , product processing with defective dimensions, damage to tools, etc. can be prevented.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a material feeding device and a bar processing machine. FIG. 2 is a control circuit diagram of the material feeding device with the device for confirming movement of the feed arrow by a certain amount of the present invention. 1... Bar processing machine, 1a... Cutting off tool, 1
b...Main shaft, 2...Bar stock, 3...Material feeding device, 4...
...feeding arrow, 5...finger chuck, 6...feather, 7...chain, CR1, CR2, CR3, CR
4...Relay, TR1...Timer.

Claims (1)

[Scope of Claims] 1. In a material feeding device that feeds bars to an automatic lathe, the amount of movement of the feed arrow is counted from the time when the feed arrow starts moving, and a signal is output at a preset value shorter than the set amount of movement of the feed arrow. a counter; a timer set to operate after the time required for the feed arrow to move by more than the preset value; and a timer that detects that the timer is activated before the counter outputs a signal according to the preset value. 1. A material feeding device with a device for confirming movement of a feed arrow by a certain amount, comprising: a device for detecting feeding abnormality. 2. A material feeding device for feeding bar material to an automatic lathe includes a counter that counts the amount of movement of the feed arrow from the time when the feed arrow starts moving and outputs a signal at a preset value that is longer than the set amount of movement of the feed arrow; A material feeding device with a device for confirming movement of a feed arrow by a certain amount, comprising: a device for detecting feeding abnormality by sensing output of the preset value.