JP5946185B2 - Belt-shaped workpiece conveyance device and method for conveying a strip-shaped workpiece of a press machine - Google Patents

Description

  In the present invention, a product having a desired shape is press-formed from a strip-shaped workpiece (in the present invention, press-molding includes punching, plastic working, etc.). The strip-shaped workpiece transfer device and the strip-shaped workpiece transfer method for positioning the workpiece, and more specifically, when the strip-shaped workpiece stops being transferred, the positional deviation accompanying the movement of the movable mold (hereinafter referred to as a load) is displayed and optimized. The present invention relates to a belt-like workpiece conveyance device and a belt-like workpiece conveyance method capable of confirming a load for determining a release timing (release time).

  In the above-described belt-shaped workpiece conveyance device of a press machine, for example, as shown in Patent Document 1, a belt-shaped workpiece is sandwiched between a driving roller connected to a servomotor and a pressure roller that presses against the peripheral surface of the driving roller. Transport that can be controlled numerically, such as a servo motor, based on a signal from a rotation angle detection member that detects the rotation angle of the crankshaft of a crank mechanism that drives the ram of the machine up and down and a signal from a detection member that detects the amount of ram lift The driving electric motor is driven to convey the belt-like workpiece sandwiched between the driving rotating body and the pressing rotating body, and when the movable mold reaches a predetermined height with respect to the fixed mold, the conveying driving electric motor is After the deceleration stop control, the press contact of the pressing rotator with respect to the drive rotator is released (released), and the punched portion of the belt-like workpiece is positioned on the fixed mold.

In the belt-like workpiece transfer device, a rotary encoder that detects preset drive control data (transfer length data, transfer speed data, transfer acceleration data, etc.) of the electric motor and the rotation angle (rotation position) of the electric motor. The electric motor is closed-loop controlled based on a position detection signal from a position detector, etc., and the conveyance control is performed so that the punched portion of the belt-like workpiece is positioned with high positional accuracy with respect to the press position of the fixed mold.

Then, the press machine or the belt-shaped workpiece transfer device outputs a release start signal for releasing the clamping of the band-shaped workpiece by the pressing rotator when the belt-shaped workpiece to be transferred is stopped at the predetermined press position, and after the press processing. It is configured to output a release end signal for holding (holding) the belt-like workpiece by the pressing rotator to enable conveyance.

When the time interval between the release start and the release end is short, that is, when the output timing of the release start signal after the conveyance stop is late , there is a gap between the fixed mold and the belt-like work, so the movable mold that descends There is a problem that the belt-like work held by contact with the wire is drawn into the fixed mold side and is displaced.

Similarly, the pilot pin provided on the die is positioned by entering the pilot hole provided at the end of the belt-shaped workpiece in the conveyance orthogonal direction. However, there is a problem that the belt-shaped workpiece held at the time of positioning is displaced. Have.

When press working is performed in the above-described misalignment state, the band-shaped workpiece may be deformed or damaged, or an excessive load may be applied to the driving rotating body, the pressing rotating body, the mold, or the press machine.

On the contrary, when the time interval between the release start and the release end is long, that is, when the output timing of the release start signal after the conveyance stop is early, the holding of the belt-like work by the drive rotator and the pressing rotator is released. Since it moves freely, there is a risk that the belt-shaped workpiece will be greatly displaced due to contact with the movable mold to be machined or the pilot pin is inserted, resulting in poor product press working accuracy or damage to the mold. is there.

  A similar problem occurs when the holding of the belt-shaped workpiece is resumed by a release end signal output after press working. When the movable die is lifted and extracted from the stamped trace after pressing in the press machine, a frictional force is generated between the movable die and the strip-shaped workpiece, and this frictional force brings the strip-shaped workpiece to the movable die side. There is a risk of rampage. In general, in a press machine, in order to solve this problem, a stripper plate is provided on the movable mold side, and the strip-shaped workpiece is peeled off from the movable mold.

When the output timing of the release end signal is early in the press machine provided with such a stripper plate, and therefore when the holding timing is early with respect to the stripping timing of the strip-shaped workpiece, the held strip-shaped workpiece is caused by the above-described stripper plate. There is a possibility that a load is applied by being peeled off, and the belt-like workpiece is deformed or damaged, or an excessive load is applied to the driving rotating body, the pressing rotating body, the mold, or the press machine.

In the press machine, the operator determines the release timing of the release start signal and the release end signal while confirming the holding release (holding restart) by the driving rotary body and the pressing rotary body and the holding (holding release) by the mold. ing. When the press is driven at a low speed, the timing can be set while visually checking. However, when the press is driven at a high speed such as 1,000 spm, the above state should be checked visually. Is extremely difficult or impossible, and it is not easy to determine the output timing of each release signal.

Also, when the belt-like workpiece is displaced from the stop position, the electric motor is driven in reverse according to the amount of displacement and the belt-like workpiece is pulled back to the stop position. The belt-like work has a problem that it is excessively pulled back and deforms or breaks.

Japanese Patent Laid-Open No. 2003-25030

  The problem to be solved is that it is difficult to confirm the holding release (holding restart) by the driving rotary body and the pressing rotary body and the holding (holding release) by the mold, and the output timing of the release start signal and the release end signal is determined. It is difficult to decide. If the electric motor is reversely driven with a high torque when the belt-like workpiece is displaced from the stop position, the belt-like workpiece may be excessively pulled back and deformed or damaged.

Claim 1 is provided in a press machine that presses a band-shaped workpiece carried between a fixed mold and a movable mold, and the band-shaped workpiece is set in advance with a predetermined feed as the numerically controlled electric motor is driven. In the workpiece transfer device that sequentially transfers the amount and supplies it to the press, it is driven and connected to the electric motor, and is output along with the movement of the movable mold with respect to the fixed mold and the transfer means for holding and transferring the strip-shaped workpiece. A release means for releasing the holding of the belt-like work by the transfer means based on the release start signal and holding the belt-like work by the transfer means based on the release end signal, and a release start signal and a release end signal when the transfer of the belt-like work is stopped. when output respectively, and a load detection means for detecting a positional deviation amount of the belt-like work with respect to the stop position as a load, the load sensing means Display means for displaying the load as a position deviation amount of the belt-like work with respect to the stop position is known, stop the strip-shaped workpiece by an electric motor drive control and when the strip-shaped workpiece is misaligned from the stop position during the transfer stopping the belt-like work together back to position and control means for controlling display on the display means the load of the positional deviation amount detected by the load detecting means when returning the strip-shaped workpiece to the stop position, the position relative to the strip-shaped workpiece during transfer stopped by the display means The main feature is that the load as the amount of deviation can be confirmed.

Claim 8 is provided in a press machine that presses a strip-shaped workpiece carried between a fixed mold and a movable mold, and the strip-shaped workpiece is set to a predetermined feed set in advance by driving an electric motor capable of numerical control. In a workpiece transfer device that sequentially transports by volume and supplies it to a press machine, when the release start signal and release end signal are output in a state where the strip workpiece is displaced with respect to the stop position when the transfer of the strip workpiece is stopped, The drive control is performed so that the motor is driven to return the belt-like workpiece to the stop position, and the load detection means detects the amount of positional deviation of the belt-like workpiece with respect to the stop position as a load, and the load as the amount of positional deviation detected by the display means The main feature is that it is possible to confirm the amount of positional deviation of the belt-like workpiece when the conveyance is stopped by displaying.

  The present invention can easily determine the release timing of the release start signal and the release end signal by easily confirming the release (holding restart) of the belt-like workpiece by the transfer means and the holding (holding release) by the mold. . When the belt-shaped workpiece carried into the press position is displaced, the driving torque of the electric motor can be limited to prevent deformation or breakage of the belt-shaped workpiece.

It is a perspective view which shows the outline of the press machine with which the strip | belt-shaped workpiece conveyance apparatus was mounted | worn. It is a perspective view which shows a strip | belt-shaped workpiece conveyance apparatus. It is an electrical block diagram which shows the outline of a control means. It is a perspective view which shows the press cycle of a press. It is explanatory drawing which shows the rotational speed of an electric motor. It is explanatory drawing which shows the torque of an electric motor. It is explanatory drawing which shows a torque limitation state. It is explanatory drawing which shows the example of a change of a transfer means.

When the release start signal and the release end signal are output with the belt-shaped workpiece shifted from the stop position when the belt-work transfer is stopped , the electric motor is driven to return the belt-shaped workpiece to the stop position and detect the load. The best embodiment is that the amount of positional deviation of the belt-like workpiece relative to the stop position is detected by the means as a load and displayed on the display means , and the load as the amount of positional deviation of the belt-like workpiece when the transfer is stopped can be confirmed by the display means. And

The present invention will be described below with reference to the drawings showing embodiments.
1 and 2, a slider 5 is supported on the main body frame 3 of the press machine 1 so as to be movable up and down, and a crank mechanism 7 is coupled to the slider 5. The crank mechanism 7 is connected to an electric motor 9 at one end via a flywheel 7a and a clutch 7b. The electric motor 9 is provided with a rotation angle detection member 11 such as a resolver or a rotary encoder.

In the figure, reference numeral 7 c is a crankshaft, 7 d is a crank portion of the crankshaft 7 c, and 7 e is a crank arm that is pivotally supported by the slider 5.

The slider 5 is moved up and down with a predetermined stroke by a crankshaft 7c that rotates as the electric motor 9 rotates. The rotation angle detection member 11 outputs a detection signal corresponding to the rotation angle of the crankshaft 7c, and thus the amount of elevation of the slider 5.

Further, the press machine 1 outputs a release start signal and a release end signal based on the detection signal output from the rotation angle detection member 11. The release start signal is output at a timing immediately before the movable mold 17 approaches the fixed mold 19, and the release end signal is output at a timing immediately after the movable mold 17 is separated from the fixed mold 19.

The release start signal and the release end signal described above do not necessarily have to be configured to be output from the press machine 1, and may be configured to output these release signals from, for example, a belt-shaped workpiece transfer device 25 described later. .

A movable mold 17 for punching and molding a product (not shown) of a desired shape from the strip-shaped workpiece 13 is attached to the slider 5, and a fixed mold 19 is attached to the main body frame 3 facing the movable mold 17. Mounted.

Reference numeral 21 in the figure is a guide post that has an axis in the vertical direction and is attached to the fixed mold 19, and 23 is attached to the movable mold 17, and the guide post 21 is inserted when the slider 5 is lowered. This is a boss for positioning the fixed mold 19 and the fixed mold 17.

A strip-shaped workpiece transfer device 25 is provided on the carry-in side (right side in the figure) of the main body frame 3. A drive roller 27 constituting a part of a transfer means having an axis in a horizontal direction perpendicular to the ascending / descending direction of the slider 5 is rotatably supported on a main body frame (not shown) of the belt-like workpiece transfer device 25. . An electric motor 31 such as a servo motor capable of numerical control is connected to the drive roller 27, and a feed amount detector 35 such as a magnetic or optical rotary encoder is attached to the electric motor 31. , And hence the feed amount of the belt-like workpiece 13 by the drive roller 27 is detected.

A swing arm 28 is pivotally supported on the main body frame, and a pressing roller 29 that constitutes a part of the transfer means can be rotated on one end of the swing arm 28, and the outer periphery of the opposing drive roller 27 can be rotated. It is pivotally supported so as to contact the surface. Further, a pressing operation member 33 such as an air cylinder or an electromagnetic solenoid is connected to the other flange portion of the swing arm 28, and the pressing operation member 33 is based on a release start signal and a release end signal output from the press machine 1. Actuated to swing the pressing roller 29 against the driving roller 27 in the direction in which the pressing roller 29 comes into pressure contact with the driving roller 27 and in the direction away from the driving roller 27. Note that reference numeral 30 in the figure denotes a support roller provided in the belt-like workpiece transfer device 25.

The belt-like workpiece supply device 25 is provided with a control box 39 in which a control means 37 (described later) is accommodated. In the control box 39, data relating to the feed amount of the belt-like workpiece 13 is set, or drive control data ( A data setting device 39a such as a numeric keypad for setting rotation speed data, rotation acceleration data, feed start position data, feed end position data, etc., a torque limit setting device 39b for setting a torque limit value of the electric motor 31, and the like. It has been.

Further, when a release start signal and a release end signal are output from the press machine 1 or the strip-shaped workpiece supply device 25 to the control box 39, the torque is detected based on the drive current applied to the electric motor 31, and the control box 39 is set to the stop position. A display member 41 that displays a load indicating the position shift state of the belt-like workpiece 13 is provided. The display member 41 display unit 41a includes a first display unit 41a that displays a load variation when the holding of the belt-like workpiece 13 is released, and a second display unit 41b that displays a load variation when the holding of the belt-like workpiece 13 is resumed. Composed. The first, second, and 41b are composed of, for example, five LEDs, and display the load state by switching the number of lighting according to the degree of load fluctuation.

In addition, as a display control method of the load fluctuation by the display member 41, when the press machine 1 is driven at high speed, it is difficult or impossible for the operator to visually confirm even if the display is switched for each press. Control may be performed so that the maximum value (peak) of the load is displayed.

In FIG. 3, a program memory 45 and a work memory 47 are connected to the CPU 43 of the control means 37, and program data for transporting the belt-like workpiece 13 with a preset transport length and a release signal are output to the program memory 45. Various program data such as display program data for displaying the load state of the program is stored.

In the work memory 47, a feed amount storage area 47a for storing feed amount data of the belt-like workpiece 13 set in advance according to the product, rotation speed data of the electric motor 31 set in correspondence with the number of presses of the press machine 1, and A drive data storage area 47b for storing acceleration / deceleration data, a counter area 47c for measuring and storing the drive amount of the electric motor 31, and hence the feed amount of the belt-like workpiece 13, based on a signal from the feed amount detector 35, and a load peak value Has a peak value storage area 47d.

The CPU 43 is connected to motor drive control means 49 for controlling the drive of the electric motor 31. The motor drive control means 49 receives a detection signal output from the feed amount detector 35 as the electric motor 31 is driven. . The motor drive control means 49 detects the feed position detected based on the feed amount detection signal output from the feed amount detector 35 as the electric motor 31 is driven, and the belt-like workpiece 13 stored in the feed amount storage area 47a. The electric motor 31 is driven and controlled based on the rotational speed data and acceleration / deceleration data stored in the drive data storage area 47b based on the difference in feed amount data so that the punched portion of the belt-like workpiece 13 is positioned at a predetermined press position. Transport to.

Further, the motor drive control means 49 moves the electric motor 31 to the feed amount detector 35 when the belt-like workpiece 13 is displaced due to the contact of the movable mold 17 that is lowered when the punched portion of the belt-like workpiece 13 is moved to the press position. The feed amount is detected and the feed amount data stored in the feed amount storage area 47a is controlled so as to be driven back in the reverse direction.

A torque detector 51 is connected to the CPU 43, and the torque detector 51 detects the torque of the electric motor 31 based on a drive current applied to the electric motor 31. Further, a torque limiting portion 53 is connected to the CPU 43, and the torque limiting portion 53 is displaced due to the contact of the movable mold 17 that descends in a state where the punching position of the band-shaped workpiece 13 is located at the press position. The torque is limited by limiting the drive current applied to the electric motor 31 that is reversely driven to the current value (torque) set by the torque limit setting device 39b.

A display control means 55 is connected to the CPU 43, and the display control means 55 controls the number of LED lighting of the corresponding first and second display portions 41a and 41b based on the load peak value stored in the peak value storage area 47d. To display the load status. That is, the display control means 55 displays the load state by switching the number of lighting LEDs corresponding to the position shift width.

A load comparison unit 57 is connected to the CPU 43, and the load comparison unit 57 detects the drive torque and peak value storage area 47d of the electric motor 31 detected by the torque detection unit 51 when a release start signal and a release end signal are output. If the detected drive torque is larger than the stored load peak value, the load peak value stored in the peak value storage area 47d is rewritten with the detected drive torque. To remember.

The CPU 43 is connected to each signal line from the release start signal and release end signal, the data setter 39a, the torque limit setter 39b, and the feed amount detection member 35 via the interface 59.

Next, the transporting action and transporting method of the strip-shaped workpiece 13 by the strip-shaped workpiece transporting device 25 configured as described above will be described.
First, the press working action of the belt-like workpiece 13 by the press machine 1 will be described. For example, as shown in FIG. 4, the slider 5 is at the top dead center when the rotation angle of the crankshaft 7c is 0 degrees, and the slider is when it is 180 degrees. 5 is located at the bottom dead center, for example, a rotation area of 280 to 80 degrees is set as a belt-like work conveyance area, and a rotation area of 120 to 240 degrees is set as a press work area.

Then, rotation areas of 80 to 120 degrees and 240 to 280 degrees are set as the stop areas of the belt-like workpiece 13, respectively, and a release start signal is output in the rotation area approaching 120 degrees, and in the rotation area approaching 240 degrees. It is set to output a release end signal.

It should be noted that the signal transmission speed, the signal processing speed, and the pressing operation are between the output timing of the release start signal and the release end signal and the timing at which the clamping of the belt-like workpiece 13 is actually released and the timing at which the belt-like workpiece 13 is actually clamped. There is a time lag due to the operation response speed of the member 33 and the like.

  When the movable die 17 enters the fixed die 19 and the product is punched from the punched portion of the strip-shaped workpiece 13 and pressed, and then the movable die 17 is moved upward to leave the punched trace 13 a of the strip-shaped workpiece 13. In response to the release end signal, the belt-shaped workpiece transfer device 25 operates the pressing operation member 33, presses the pressure roller 29 against the belt-shaped workpiece 13 supported on the driving roller 27, and holds the electric motor 31. Is controlled based on the drive control data stored in the drive data storage area 47b and the feed amount storage area 47a for storing the feed amount data, and is conveyed so that the next punched portion of the belt-like workpiece 13 is located at the press position. To do.

  Then, when the movable die 17 rises to the top dead center and then approaches the belt-like workpiece 13 which is lowered and conveyed toward the bottom dead center, the belt-like workpiece conveyance device 25 stops the conveyance of the belt-like workpiece 13 and punches it. In response to the release start signal after the position is located at the press position, the pressing operation member 33 is moved backward to move the pressing roller 29 away from the belt-like workpiece 13 supported on the driving roller 27 to release the clamping. Lets move to.

  In the above state, the movable mold 17 is further lowered to form a product by pressing the punched portion of the belt-like work 13 carried into the press position, and then the movable mold 17 is moved upward from the bottom dead center. The press work is continuously executed by repeating the above operation.

As a release start signal output from the press 1, the movable mold 17 descending toward the fixed mold 19 comes as close as possible to the punched portion carried into the press position, and as the release end signal, It is required to set the timing immediately after the movable mold 17 is detached from the stamped trace 13a of the belt-like workpiece 13.

In the present embodiment, in order to determine the output timing of the release start signal and the release end signal, the press machine 1 and the work supply device 25 are connected to perform an empty press operation prior to the actual press operation. Confirm the release timing as follows.

Now, assuming that the release start signal is output at the timing when the lowering movable mold 17 comes into contact with the punched portion of the belt-like workpiece 13 that has been stopped at the press position, the belt-like workpiece 13 is driven by the drive roller 27 and the pressing roller by the contact. In a state of being sandwiched by 29, it is drawn into the fixed mold 19 side and is displaced. That is, the output timing of the release start signal is delayed with respect to the lowering of the movable mold 17.

As described above, when the output timing of the release start signal is delayed with respect to the lowering of the movable mold 17 and the belt-like workpiece 13 is displaced from the stop position (the release start signal is output after the conveyance of the belt-like workpiece 13 is stopped). If the position of the belt-shaped workpiece 13 is shifted to a predetermined stop position, the electric motor 31 is reversely driven in accordance with the amount of the position shift from the stop position.

The drive current applied when the electric motor 31 is driven in the reverse rotation corresponds to the position shift width. When the position shift width is large, the current applied to the electric motor 31 increases and the drive torque increases. However, when the displacement width is small, the drive torque is low. That is, the driving torque of the electric motor 31 varies corresponding to the position shift width.

At this time, the drive torque of the electric motor 31 is detected by the current value applied to the electric motor 31 by the torque detector 51, the load peak value is stored in the peak value storage area 47d, and the display control means 55 performs the first display. The LEDs in the unit 41a are turned on in accordance with the number corresponding to the load peak value stored in the peak value storage area 47d, and accordingly in accordance with the position shift width.

Then, when the belt-like workpiece 13 is conveyed after the press working and the next punched place is stopped at the press position, the driving torque of the electric motor 31 when the positional deviation of the belt-like workpiece 13 is corrected is detected in the same manner as described above. Then, the driving torque detected by the load comparison unit 57 is compared with the load peak value stored in the peak value storage area 47d.

If the detected drive torque is greater than the load peak value stored in the peak value storage area 47d, the drive torque peak value stored in the peak value storage area 47d is rewritten and stored with the detected drive torque value. The display control means 55 switches the number of LEDs lit on the first display section 41a to the number corresponding to the load peak value stored in the peak value storage area 47d to display the LED.

The drive torque detection operation and the display operation of the first display unit 41a based on the current value applied when the electric motor 31 is driven in reverse rotation when the release start signal is output may be executed for each press operation. It may be executed every predetermined number of press operations.

Then, the operator confirms the amount of positional deviation of the belt-like workpiece 13, and thus the delay in the output timing of the release start signal, based on the number of lighting LEDs in the first display portion 41a, and the output timing of the release starting signal according to the number of lighting LEDs. The optimum release timing of the release start signal is determined by adjusting so as to advance the time.

On the other hand, when the output timing of the release end signal is earlier than the timing at which the strip-shaped workpiece 13 is peeled off from the movable mold 17 that is lifted after the press working, the strip-shaped workpiece 13 is sandwiched between the driving roller 27 and the pressing roller 29. In this state, it is displaced by being peeled off by a strip plate (not shown).

When the belt-like workpiece 13 is peeled off from the movable mold 17 and displaced as described above, the electric motor 31 is driven reversely in accordance with the amount of displacement similarly to the above, and the belt-like workpiece 13 is pulled back to a predetermined stop position. Perform corrective action.

As described above, the drive current applied when the electric motor 31 is driven in reverse corresponds to the position shift width. When the position shift width is large, the drive torque is increased by the large current applied to the electric motor 31. On the other hand, when the misalignment width is small, the drive torque is low.

At this time, the torque detection unit 51 detects the driving torque based on the current value applied to the electric motor 31, and the load peak value is stored in the peak value storage area 47d, and the display control means 55 uses the second display unit 41b. The LEDs are lit in the number corresponding to the load peak value stored in the peak value storage area 47d, and accordingly in accordance with the position shift width.

Then, after correcting the positional deviation of the belt-like workpiece 13 with respect to the stop position after the next press working, the driving torque of the electric motor 31 is detected, and the driving torque detected by the load comparison unit 57 and the peak value are stored. The load peak value stored in the region 47d is compared.

If the detected drive torque is greater than the load peak value stored in the peak value storage area 47d, the drive torque peak value stored in the peak value storage area 47d is rewritten and stored with the detected drive torque value. The display control means 55 switches the number of lighting LEDs in the second display section 41b to the number corresponding to the load peak value stored in the peak value storage area 47d.

In addition, the detection operation of the drive torque based on the current value applied when the electric motor 31 is driven in reverse rotation when the release end signal is output and the display operation of the second display unit 41b may be executed for each press operation. Alternatively, it may be executed every predetermined number of press operations.

Then, the operator confirms that the positional deviation amount of the belt-like workpiece 13, and thus the release timing of the release end signal, is early based on the number of lighting LEDs in the second display section 41b, and outputs the release end signal according to the number of lighting LEDs. The optimum output timing is determined by adjusting so as to delay the timing.

Further, as described above, the belt-like workpiece 13 stops when the strip-like workpiece 13 is peeled off from the movable die 17 by the stripper plate after the contact with the belt-like workpiece 13 whose punching position is stopped at the press position or after the press working. When the position is displaced with respect to the position, the electric motor 31 is reversely driven to return to a predetermined position to correct the position deviation.

At that time, when the electric motor 31 is driven with a large current, and therefore with a high torque, the belt-like workpiece 13 is pulled back in a short time with an excessive torque and deformed or damaged, or the drive roller 27 is driven to rotate with an excessive torque. May cause damage.

In the present embodiment, as shown in FIG. 7, when the electric motor 31 is driven in reverse, the drive current applied by the torque limiter 53 is set lower than the torque when the belt-like workpiece 13 is conveyed by the torque limit setting unit 39b. The above problem is solved by limiting the torque by limiting the current value.

In the present embodiment, the release from the press machine 1 can be started by making it possible to display and confirm the positional deviation of the belt-like workpiece 13 when the conveyance is stopped as the fluctuation state of the driving torque due to the driving current applied to the electric motor 31. Determination of the output timing (release time) of the signal and the release end signal can be facilitated.

  Further, when the belt-like workpiece 13 is displaced with respect to the stop position after the conveyance stop and after the press operation, the electric motor 31 is driven in reverse to correct the displacement with respect to the stop position. In that case, the electric motor 31 is corrected. The drive torque is limited by limiting the current value applied to the belt to be lower than the current value applied during conveyance, and the belt-like workpiece 13 is pulled back with an excessive torque in a short time to be deformed or damaged. It is possible to prevent the 27 from being damaged by being rotationally driven with an excessive torque.

The present invention can be modified as follows.
1. In the present embodiment, the load fluctuation at the time when the belt-like workpiece 13 is stopped is displayed on the display member 41 and the fluctuation of the driving torque due to the driving current applied to the electric motor 31 can be confirmed. The positional deviation between the detection signal and the position data of the press position may be detected, and the positional deviation may be displayed on the display member 41 as a load change so as to be confirmed.

2. In the case where the load variation detected when the conveyance of the belt-like workpiece 13 is stopped is large, in addition to the display function described above, a function may be added in which a warning buzzer, a warning, and the like are controlled to warn and notify the worker. .

3. The first and second display portions 41a and 41b of the display member 41 are configured to be able to display and check the load fluctuation state by changing the number of lighting of the plurality of arranged LEDs, but the load fluctuation state is numerically displayed. It is good also as a structure which displays and an indicator display.

4). In the above description, the transfer means is constituted by the drive roll 27 connected to the electric motor 31 and the pressure roll 29 pressed against the drive roll 27, and the belt-like work 13 positioned between them is sandwiched and rotated and conveyed. It is good also as the transfer means 81 shown in Unexamined-Japanese-Patent No. 5-15933.

  That is, as shown in FIG. 8, a pair of rotating bodies 85 are rotatably supported at both ends in the longitudinal direction of the main body frame 83 in the transfer means 81, and one rotating body 85 is provided with a numerically controllable servo motor or the like. An electric motor 87 is connected. A belt 89 such as a timing belt is wound around the pair of rotating bodies 85 and travels in the forward and reverse directions as the electric motor 87 is driven.

Further, the main body frame 83 is provided with a support rail 91 extending in the longitudinal direction, and the first and second traveling bodies 93 and 95 are supported on the support rail 91 so as to individually move in the longitudinal direction. The first traveling body 93 is attached to the upper portion of the belt 89, and the second traveling body 95 is attached to the lower portion of the belt 89 so as to be adjacent to each other in the middle portion in the longitudinal direction of the main body frame 83. The first and second traveling bodies 93 and 95 are moved in a direction away from and closer to each other as the electric motor 87 is driven.

The first and second traveling bodies 93 and 95 are provided with arms 93a and 95a extending in a predetermined length in the longitudinal orthogonal direction, and gripping portions 93b and 95b are provided at the distal ends of the arms 93a and 95a. . The gripping portions 93b and 95b are pivotally supported so that the other claw portions 93d and 95d open and close with respect to the one claw portion 93c and 95c, and the air cylinders and electromagnetic solenoid actuating members provided on the arms 93a and 95a. 93e and 95e are connected, and the other claw portions 93d and 95d are opened and closed with respect to the one claw portion 93c and 95c by the operation of the operation members 93e and 95e.

Then, with the first traveling body 93 positioned on the upper side in the transport direction of the main body frame 81 and the second traveling body 95 positioned on the lower side in the transport direction, the operating member 93e is operated to close the other claw portion 93d. After holding the end of the belt-shaped workpiece 13 cut in a predetermined length in the conveyance orthogonal direction, the electric motor 87 is driven to move the first and second traveling bodies 93 and 95 toward each other, and the belt-shaped workpiece held. The workpiece 13 is conveyed to the press position.

After the pressing operation, the holding of the belt-like workpiece 13 by the first traveling body 93 is released, and the operating member 95e in the second traveling body 95 is operated to close the other claw portion 95d, thereby pressing the belt-like workpiece 13 that has been pressed. The conveyance orthogonal direction edge part in is hold | maintained.

Next, the electric motor 87 is driven in the opposite direction to move the first and second traveling bodies 93 and 95 in a direction away from each other to return the first traveling body 93 to the original position and press work. 13 is carried out.

In addition, in the holding | grip type strip | belt-shaped workpiece conveyance apparatus shown in FIG. 8, you may comprise as a holding | grip part which grips the strip | belt-shaped workpiece | work 13 over the whole conveyance orthogonal direction. In addition, the belt-like workpiece transfer device shown in FIG. 8 is configured to move the two gripping portions in directions toward and away from each other to carry in and carry out the belt-like workpiece. Alternatively, a configuration may be adopted in which the gripping portion is reciprocated to sequentially feed the belt-like workpiece.

5. Although the above description has shown the press 1 which presses the belt-shaped work carried by moving the movable mold up and down relative to the fixed mold and moving the movable mold up and down with respect to the fixed mold, As the press machine 1, a movable mold is arranged below the fixed mold, and the movable machine is moved up and down with respect to the fixed mold to press the belt-shaped workpiece carried in, and fixed. The pressing machine 1 may be configured such that the mold and the movable mold are disposed in the horizontal direction and the movable mold is reciprocated in the horizontal direction (lateral direction) with respect to the fixed mold to press the belt-like workpiece.

DESCRIPTION OF SYMBOLS 1 Press machine 3 Main body frame 5 Slider 7 Crank mechanism 7a Flywheel 7b Clutch 7c Crankshaft 7d Crank part 7e Crank arm 9 Electric motor 11 Rotation angle detection member 13 Band-shaped workpiece 13a Punching trace 17 Movable die 19 Fixed die 21 Guide post 23 Boss 25 Band-shaped work conveyance device 27 Drive roller 28 as driving rotary body Peristaltic arm 29 Pressing roller 30 as pressing rotary body Support roller 31 Electric motor 33 Pressing operation member 35 Feed amount detector 37 Control means 39 Control box 39a Data setting Device 39b torque limit setting device 41 display member 41a first display portion 41b second display portion 43 CPU
45 Program memory 47 Work memory 47a Feed amount storage area 47b Drive data storage area 47c Counter area 47d Load peak value storage area 49 Motor drive control means 51 Torque detection part 53 Torque limiter 55 Display control part 57 Load comparison part 59 Interface 81 Transfer Means 83 Body frame 85 Rotating body 87 Electric motor 89 Belt 91 Support rails 93 and 95 First and second traveling bodies 93a and 95a Arms 93b and 95b Grip portions 93c and 95c One claw portion 93d and 95d The other claw portion 93e and 95e Actuating member

Claims (14)

It is provided in a press machine that presses the band-shaped work carried between the fixed mold and the movable mold, and sequentially conveys the band-shaped work with a predetermined feed amount as the numerically controllable electric motor is driven. In the workpiece transfer device that supplies the press machine
A transfer means that is drivingly connected to the electric motor and holds and transfers the belt-like workpiece;
A release means for releasing the holding of the belt-like workpiece by the transfer means based on the release start signal output as the movable mold moves with respect to the fixed mold, and holding the belt-like workpiece by the transfer means based on the release end signal;
When the strip-shaped workpiece release start signal and the release completion signal when the transfer stopping is output respectively, and a load detection means for detecting a positional deviation amount of the belt-like work with respect to the stop position as a load,
Display means for displaying the load as the amount of positional deviation of the belt-like workpiece with respect to the stop position detected by the load detection means;
Misregistration strip-shaped workpiece during transport stop of the belt-like work is detected by the load detecting means when returning the strip-shaped workpiece to the stop position with return strip-shaped workpiece by driving control of the electric motor when misaligned from the stop position to stop position Control means for controlling display as a quantity on the display means;
With
A belt-like workpiece conveyance device of a press machine, which can confirm a load as a positional deviation amount with respect to the belt-like workpiece when the transfer is stopped by a display means. In claim 1,
The transfer means is composed of a drive rotator coupled to the electric motor and a press rotator that contacts and separates from the drive rotator.
A belt-like workpiece transport device of a press machine that sandwiches and transports a belt-like workpiece supported on a driving rotary member by a pressing rotary member. In claim 1,
The transfer means is composed of a movable body that reciprocates in a direction that coincides with the transfer direction of the belt-like workpiece as the electric motor is driven, and a holding member that is provided on the movable body and can hold the belt-like workpiece,
A belt-shaped workpiece transport device for a press machine that holds and transports a belt-shaped workpiece by moving a movable body. In claim 1,
Load detecting means, and a torque detector for detecting a driving torque of the electric motor, the strip-shaped workpiece which is misaligned from the stop position during the transfer stopping the belt-like work, the electric motor when the electric motor drive control to return to the rest position A belt-like workpiece transfer device of a press machine that detects a load as a displacement amount by a driving torque detected based on a driving current applied to the press. In claim 1,
Load detecting means, a feed detector for detecting the feed rate of the strip-shaped workpiece by the electric motor, belt-like press work for detecting the load position shift amount of the strip-shaped workpiece relative to the stop position by the detector sends during the transfer stopping the belt-like work Conveying device. In any one of Claims 1 thru | or 5,
The control means is a belt-like work conveyance device for a press machine that controls the display means to display a peak value of a load as a positional deviation amount detected when returning the belt-like work displaced from the stop position to the stop position. In claim 1,
When the electric motor is driven and controlled by the displacement of the belt-like workpiece with respect to the stop position, the control means limits the torque by setting the drive current applied to the electric motor to be lower than the current value applied during the conveyance of the belt-like workpiece. A belt-like workpiece transfer device for press machines. It is provided in a press machine that presses the band-shaped work carried between the fixed mold and the movable mold, and sequentially conveys the band-shaped work with a predetermined feed amount as the numerically controllable electric motor is driven. In the workpiece transfer device that supplies the press machine
When the release start signal and the release end signal is outputted in a state in which the strip-shaped workpiece is misaligned with respect to the stop position when the transfer stop of the belt-like work, drive to the electric motor drive control to return the strip-shaped workpiece to the stop position The load detection means detects the amount of displacement of the belt-like workpiece with respect to the stop position as a load,
A belt-shaped workpiece conveyance method for a press machine, in which a load as a detected positional deviation amount is displayed on a display means, so that the positional deviation amount of the belt-shaped workpiece when conveyance is stopped can be confirmed. In claim 8,
A belt-shaped workpiece conveyance method for a press machine, in which a belt-shaped workpiece is held and transferred by a driving rotator coupled to an electric motor and a pressing rotator contacting and separating from the driving rotator. In claim 8,
A belt-like workpiece conveyance method for a press machine, in which a belt-like workpiece is held and transferred by a holding member provided on a movable body that reciprocally moves in a direction coinciding with the direction of belt-like workpiece transfer as the electric motor is driven. In claim 8,
Load detecting means, and a torque detector for detecting a driving torque of the electric motor, the strip-shaped workpiece which is misaligned from the stop position during the transfer stopping the belt-like work, the electric motor when the electric motor drive control to return to the rest position A belt-like workpiece conveyance method for a press machine, wherein a load as a displacement amount is detected by a driving torque detected based on a driving current applied to the press. In claim 8,
Load detecting means, a feed detector for detecting the feed rate of the strip-shaped workpiece by the electric motor, belt-like press work for detecting the load position shift amount of the strip-shaped workpiece relative to the stop position by the detector sends during the transfer stopping the belt-like work Transport method. In any one of Claims 8 thru | or 12.
The load displayed on the display means is a belt workpiece transport method for a press machine in which a load peak value is detected as a displacement amount detected when the belt workpiece displaced from the stop position is returned to the stop position. In claim 8,
The drive current applied to the electric motor is lower than the current value applied during the transfer of the belt-shaped workpiece when the belt-shaped workpiece is returned to the stop position by controlling the drive of the belt-shaped workpiece with respect to the stop position. A belt-shaped workpiece transfer method for press machines that limits torque.

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