JPH0591819U - Resin sheet molding equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] In equipment that performs compression molding of resin sheets with upper and lower molds, it detects the failure of an encoder that measures the moving distance of various moving members and stops the movement of various members. [Structure] A pair of encoders are attached to a moving device for moving various members or various members, and
These encoders are electrically connected to the control device to count the pulse signals from the two encoders that are installed side by side, and the difference between these two types of counted pulse values and the preset allowable value When the difference becomes larger than the allowable value, the movement of various members is stopped.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to equipment useful for compression-molding a resin sheet with upper and lower molds, and more particularly to a resin sheet molding equipment capable of easily detecting a failure of an encoder or the like.

[0002]

[Prior Art]

 Conventionally, for example, in compression-molding a resin sheet with upper and lower molds, two frames provided with a resin sheet clamp device extend horizontally and face each other at a required interval and are parallel to each other. It is designed to support the resin sheet from below and is mounted between two right and left screw rotation shafts via right and left screw nuts. By rotating the screw rotation axis forward and backward, it is possible to approach each other and pull them apart to accommodate changes in the width of the resin sheet.

[0003]

[Problems to be solved by the device]

 By the way, in the above equipment, the input shaft of the encoder is connected to one end of one of the right and left screw rotary shafts of the two right and left screw rotary shafts, and the distance between the two frames is It is designed to be measured by an encoder. However, the incidental device of the encoder or encoder sometimes breaks down, and this failure causes the two frames to approach and separate by more than a predetermined distance, damaging the device and other important parts. The present invention has been made to solve the above problems.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the resin sheet molding equipment of the present invention, two encoders for measuring the distance between various members are set as one set, and are directly or indirectly attached to a drive device or various members, The two encoders are electrically connected to the control device.

[0005]

[Action]

 The device configured in this way counts two types of pulse signals generated from two adjacent encoders and compares them simultaneously, and the difference between the two types of pulse values is greater than the preset allowable value. When it becomes, it is judged that one of the encoders is out of order, the control device issues a command to stop the drive device, and the drive device is stopped.

[0006]

【Example】

 FIG. 1 is a schematic plan view showing a first embodiment of the present invention. In FIG. 1, two horizontally extending right-hand screw rotating shafts 1 and 1 are opposed to each other at a proper interval. The two right-hand screw rotary shafts 1 and 1 are rotatably installed in parallel with each other via bearings 2 and 2, and right-hand screws are engraved on the surface. In addition, one end of each of the two right-hand screw rotary shafts 1 and 1 is connected to one end of each of the two left-hand screw rotary shafts 3 and 3 extending concentrically with the right-hand screw rotary shafts 1 and 1 via a shaft coupling 4 or 4. The left-hand screw rotating shafts 3, 3 are rotatably installed via bearings 5, 5, and left-hand screws are engraved on the surface. Further, between the other ends of the right-hand screw rotary shafts 1 and 1, a rotary shaft 7 rotatably installed via bearings 6 and 6 is connected via two pairs of bevel gears 8, 9, 8 and 9. The output shaft of the motor 10 with a reducer is connected to the other end of the rotating shaft 7 via a shaft coupling 11.

Further, two frames 12 extending horizontally between the two right-hand screw rotary shafts 1 and 1 and between the two left-hand screw rotary shafts 3 and 3 are opposed to each other and parallel to each other. 1 and 2 are mounted by penetrating the right-hand screw nuts 13 and 13 and the left-hand screw nuts 14 and 14, respectively, and the frames 12 and 12 are clamp devices (for clamping the resin sheet mounted thereon) ( (Not shown) is attached. Therefore, the two frames 12, 12 are moved closer to each other or separated from each other by the forward / reverse rotation of the motor 10 with a reduction gear.

Input shafts of encoders 16 and 16 are connected to the other ends of the left-handed screw rotary shafts 3 and 3 via shaft joints 15 and 15, respectively. Electrically connected to. Then, the control device 17 counts the pulse signals from the encoders 16 and 16, compares the counted two kinds of pulse numerical values with each other to calculate a difference, and compares the difference with a preset allowable value. Then, based on the result, a drive stop command is issued to the speed reducer motor 10.

Next, the operation of the equipment thus configured will be described. When the width of the molded resin sheet is changed to widen or narrow the interval between the two frames 12, 12, the motor 10 with a speed reducer is driven in the forward or reverse direction. Along with this, the moving distance between the two frames 12 and 12 is measured by the control device 17 counting the palace signal generated from the encoders 16 and 16. A difference occurs due to a failure of the encoders 16 and 16, and when the difference becomes larger than a permissible value preset in the control device 17, it is determined that it has failed, and the control device 17 drives the motor 10 with reduction gear. A command to stop the motor 10 is issued, and the driving of the motor 10 is stopped.

[0010]

Second Embodiment FIG. 2 is a schematic front view showing a second embodiment of the present invention, and FIG. 3 is a partial sectional plan view of a main part in FIG. In FIG. 2, a lower table 21 having a lower die (not shown) attached to the upper surface is arranged so as to be able to move up and down via a cylinder 22, and an upper die (not shown) is placed on the lower surface at a position directly above the lower table 21. The upper table 23 to which the () is attached is arranged so as to be able to move up and down via a cylinder 24. Further, racks 25 oriented in the vertical direction are attached to the upper and lower tables 23 and 21, respectively, and each rack 254 is rotatably disposed via a rotary shaft 26, as shown in FIG. The gear 27 is meshed. The rotary shaft 26 is rotatably arranged via bearings 28 and 29, and the input shafts of encoders 31 and 31 are connected to both ends via shaft couplings 30 and 30, respectively.

Further, as shown in FIG. 2, the encoders 31 and 31 are electrically connected to the control device 32, and the control device 32 counts the pulse signals from the two encoders 31 and 31 provided side by side. Then, the two counted pulse values are compared with each other to calculate the difference, the difference is compared with a preset allowable value, and the cylinders 22 and 24 are stopped based on the result. Is issued.

Next, the operation of the equipment thus configured will be described. When the resin sheets are compressed and formed, the cylinders 24 and 22 are extended or contracted to move the upper and lower tables 23 and 21 up and down. The input shaft is rotated via the rack 25 and the gear 27, and the pulse signals generated from the encoders 31 and 31 at this time are counted by the control device 32, whereby the vertical distances of the upper and lower tables 23 and 21 are increased. Will be measured. Then, a failure or the like occurs on one side between the two encoders 31 and 31 that are installed side by side, and a difference occurs between these two types of counted pulse values, and this difference is preset in the control device 32. When it becomes larger than the set allowable value, the failure is detected, the control device 32 issues a command to stop the operation of the cylinders 22, 24, and the operation of the cylinders 22, 24 is stopped. Become. In addition, in the above-described embodiment, the lifting / lowering of both the upper and lower tables 23 and 21 is controlled, but it goes without saying that only the upper table 23 or the lower table 21 may be controlled.

[0013]

[Effect of the device]

 As will be apparent from the above description, the present invention comprises a set of two encoders for measuring the distances between various members, which are directly or indirectly mounted on a drive unit or various members. Since the encoder is electrically connected to the control device, the moving distances of various members are measured by the two encoders that are installed side by side while comparing the pulse values, so there is a difference between the two types of pulse values. By doing so, it becomes possible to easily and reliably detect a failure of the encoder. Therefore, the two frames and the upper and lower tables do not excessively move, and the excessive movements of these two frames have an excellent practical effect of preventing damage.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a first embodiment of the present invention.

FIG. 2 is a schematic front view of a second embodiment of the present invention.

3 is a partial cross-sectional plan view of the main part in FIG.

[Explanation of symbols]

 1 Right-hand screw rotary shaft 3 Left-hand screw rotary shaft 8 9 Bevel gear 10 Motor with reducer 12 Frame 13 Right-hand screw nut 14 Left-hand screw nut 16 31 Encoder 17 32 Control device 21 Lower table 22 24 Cylinder 25 Rack 27 Gear

Claims (2)

[Scope of utility model registration request] 1. Two right-hand screw rotating shafts 1, 1 extending horizontally.
Are rotatably installed such that they are opposed to each other and parallel to each other at appropriate intervals, and one ends thereof are connected to one ends of the right-hand screw rotary shafts 1, 1 respectively.
Two rotary shafts 3, 3 extending concentrically with the right screw rotary shaft 1, 3 are rotatably installed, and a rotatable rotary shaft 7 is provided between the other ends of the right-hand screw rotary shafts 1, 1 in two pairs of bevel gears 8, 9, 8. , 9 are connected and mounted, and the other end of the rotating shaft 7 is provided with a motor 1 with a reduction gear.
0 output shaft is in contact, the two right-hand screw rotary shafts 1 and 1 and the two left-hand screw rotary shafts 3 and 3 extend horizontally, face each other and are parallel to each other, and Two frames 12, 12 equipped with a resin sheet clamp device
The right-hand screw nuts 13, 13 and the left-hand screw nuts 14,
The right-hand screw rotating shafts 1 and 1 and the left-hand screw rotating shafts 3 and 3 are respectively penetrated through 14 to mount the
At the other end of the left-hand screw rotary shafts 3, 3 of the book, an encoder 16,
16 input shafts are connected to each of these encoders 1
6, 16 count the two types of pulse signals generated from these encoders 16, 16 and compare the difference between the pulse numbers of these two types with the preset allowable value. Motor with reducer 1
A resin sheet molding facility, which is electrically connected to a control device 17 for issuing a command to 0. 2. A lower table 21 having a lower mold attached to its upper surface.
And / or upper table 23 having an upper mold attached to the lower surface
Is arranged via a cylinder 22 and / or a cylinder 24 so as to be able to move up and down, and racks 25, 25 extending in the vertical direction are mounted on the lower table 21 and the upper table 23, respectively. A gear 27 is engaged with each of the racks 25 via a rotatable rotary shaft 26, and two encoders 31 are provided at both ends of the shaft 26 and / or the shaft 26, respectively.
31 input shafts are connected, and a set of two encoders 3
1, 31 and / or encoders 3 for each pair of these
1 and 31 are electrically connected to a control device 32. In the control device 32, at least two types of palace signals generated from at least the pair of encoders 31 and 31 are counted, and the counted 2 A resin sheet molding facility characterized by comparing a difference in pulse value of each type with a preset allowable value and issuing a command to the cylinder 24 and / or the cylinder 24, respectively.