INJECTION MOLDING MACHINE WITH MOVABLE DISPLAY DEVICE

Abstract: An injection molding machine provided thereon with a movable display device having an outstanding controllability, not interfering with work around the injection molding machine and requiring no space for housing it in the injection molding machine. A pole (34) is erected at the back of an injection unit (20) on the side of a clamping unit (10) with respect to a swivel shaft (3) of the injection unit, and a rotary arm (33) horizontally rotatably supported on the top end portion of the pole is disposed close to the top surface of the injection unit and bent at the intermediate portion thereof. A display device (30) rested on the end portion of the rotary arm at the side opposite to the pole is movable between a retracted position (A) located upwardly of the injection unit and a use position (B) located upwardly of the injection unit and projecting from the front of the injection unit. The display device is supported by the injection unit through a ball caster (35) mounted to the under surface of the intermediate portion of the rotary arm.

Description: The present invention relates to an injection molding machine with a movable display device. In an injection molding machine, especially in an electrically-operated injection molding machine furnished with a numerical control device, a display device with a manual data input device is used to set various molding conditions, monitor the operating state, and warn of an abnormal operating state, for example. Thus, the display device plays an important role in the injection molding machine. Conventional display devices provided for the injection molding machine are divided broadly into three types: stand-type display devices fixed on a stand fixed on the floor, built-in display devices contained in the injection molding machine, and pendant-type display devices suspended from a swing arm. Some of the stand-type display devices, being fixedly arranged near the injection molding machine, sometimes become hindrances to an operator in carrying out various operations. The built-in display devices, especially large-sized CRT display devices, are so bulky and heavy in weight that they require a wide holding space, and their attachment to and detachment from the injection molding machine require some labor. Although the pendant-type display devices (see Published Unexamined Japanese Patent Application JP,A, 63-107534 and corresponding EP-A-0264601 cf. the preamble of claim 1 for example) are advantageous in being movable between a retreating position and a working position, the length of the swing arm for suspending the display device has to be limited due to its mechanical strength. This also limits the movable range of the display device, thereby causing some problem in operating efficiency such that the display device cannot be brought to an optimum position for use. Besides, the swing arm for suspending the display device needs to be installed at a considerably high position, so that a pole for supporting the swing arm is required to be long. This requires the rigidity of the pole to be increased, which leads to high cost. The object of the present invention is to provide an injection molding machine furnished with a movable display device, which will not become a hindrance to the operations to be performed around the injection molding machine, requires little or no holding space in the injection molding machine and provides high operating performance. According to the present invention there is provided an injection molding machine comprising a pole supporting a swing arm for horizontal rotation above a top face of an injection unit, and a display device mounted on an end portion of the swing arm whereby the display device is movable between a retreating position over the injection unit and a working position above but forwardly away from a front face of the injection unit, characterised in that: the pole is set up at the back of the injection unit with the swing arm being situated close to the top face of the injection unit and the display device being mounted on the swing arm on the opposite side to the pole, and the swing arm has a ball caster located on a lower surface of a middle portion thereof and rollable on the top face of the injection unit, whereby the swing arm is supported on the injection unit through the ball caster throughout movement of the swing arm between and at the retreating position and the working position of the display device. Preferably, the swing arm is bent toward the display device working position at the middle (i.e. intermediate) portion thereof. Further, the pole may be situated on the side of a mold clamping unit with respect to a swivel shaft of the injection unit on a base of the injection molding machine. As described above, in the injection molding machine of the present invention the display device is mounted on one end of the swing arm, which is swingably supported by the pole set up at the back of the injection unit situated on the opposite side to the pole, and so that the display device can be swung between the retreating position over the injection unit and the working position, which is accessible for the display device from a position along the front face of the injection unit. Thus, the display device not only can be prevented from hindering but also, unlike the display devices of the built-in type, does not require a display device holding space in the injection molding machine. Besides, the swing arm is situated close to the top face of the injection unit, so that the length of the pole can be reduced. This enables an increase in the rigidity of the pole and a resulting increase in the length of the swinging arm. Thus, the ranges of movement of the swing arm and the display device mounted thereon can be increased to improve the operating performance of the display device. This also enables the reduction of pole cost. Preferably, the rocking arm is bent toward the display device working position at the middle portion thereof to permit the ranges of movement of the swing arm and the display device to be further increased, thereby contributing to the further improvement in the operating performance of the display device. When the pole is situated on the side of a mold clamping unit with respect to a swivel shaft of the injection unit on a base of the injection molding machine, the pole will not impede horizontal rotation of the injection unit with respect to the swivel shaft. The swing arm is supported on the injection unit through the ball caster, which is provided on the lower surface of the swing arm on the display-device side to be rollable on the top face of the injection unit, so that the swing arm can be further lengthened, and therefore, the operating performance, as well as the range of movement, of the display device can be further improved. Brief Description of the Drawings Fig. 1 is a schematic front view showing an electrically-operated injection molding machine according to one embodiment of the present invention; Fig. 2 is a partial schematic plan view illustrating the movement of a display device between a retreating position and a working position and horizontal rotation of an injection unit round a swivel shaft; Fig. 3 is a partial schematic right-hand side view of the injection molding machine; and Fig. 4 is a partial enlarged side view showing a swinging arm. Referring now to Figs. 1 through 4, an electrically-operated injection molding machine according to one embodiment of the present invention will be described. The injection molding machine comprises a mold clamping unit 10 fixed on a base 1, and the mold clamping unit 10 includes a protective cover 11 covering the whole body of a mold clamping mechanism (not shown). A transparent window 12 for observing the operation of a mold mounting section of the mold clamping mechanism is provided on the front face of the left-hand half portion of the protective cover 11, while a control panel 13 for the control of operations associated with start, stop, emergency stop, manual operation, semiautomatic operation, automatic operation, etc. is provided on the front face of the right-hand half portion of the protective cover 11. Further, the injection molding machine comprises an injection unit 20 disposed on an extruder base 2 on the base 1. The injection unit 20 comprises a flat-topped protective cover 21 covering an injection mechanism (not shown), which includes front, movable, and rear plates, a cylinder assembly 22 containing a screw (not shown), and a hopper 23 located over the proximal end portion of the cylinder assembly 22. The injection unit 20, together with the extruder base 2, can move toward or away from the mold clamping unit 10 to establish or cancel the nozzle touch state. For screw replacement or the like, the injection unit 20 is made to be horizontally rotatable round a swivel shaft 3 located on the extruder base 2. The injection molding machine further comprises a movable display device 30 which includes a CRT screen 31 and a manual data input device 32. Control information delivered from a numerical control device (not shown) can be displayed on the CRT screen 31, and an operator can manually input various data through the manual data input device 32. The movable display device 30 is mounted on the top face of the distal end portion of a swing arm 33, which is supported for horizontal rotation by means of a pole 34 set up on the base 1, and is movable between the retreating position A over the injection unit 20 and the working position B situated outwardly away from the front face of the injection unit 20. More specifically, as shown in Figs. 2 and 3, the pole 34 vertically extends along the back of the injection unit 20, and its lower end is fixed to the edge portion of the base 1 in between the swivel shaft 3 and the hopper 23 on the rear side of the injection unit. The swing arm 33, which is rotatably supported of the upper end portion of the pole 34, is located close to the top face of the injection unit 20, as shown in Figs. 1 and 3, and is bent toward the working position of the display device or bent backward at the middle portion thereof, as shown in Fig. 2. More specifically, the swing arm 33 is composed of the first arm section 33a in the display device side and the second arm section 33b formed integrally therewith and extending aslant by from the first arm section 33a toward the pole 34. The second arm section 33b has the minimum necessary length enough for the display device 30 and the swing arm 33 to avoid interfering with the hopper 23 in bringing the display device 30 to the working position B. The length of the first arm section 33a and the bending angle of the swing arm 33 are determined so that the display screen 31 can be set parallel to the front face of the injection unit 20 without projecting outward from the front face of the injection unit when the display device 30 is brought to retreating position A. As shown in Figs. 3 and 4, a ball caster 35, which is horizontally rotatable with respect to the arm 33 and rollable on the top face of the injection unit 20, is attached to the lower surface of the middle portion of the swing arm 33. The swing arm 33 and the display device 30 are supported vertically through the ball caster 35 on the injection unit 20. The ball caster 35 is attached to a position e.g. a bent portion of the arm 33, whereby the arm 33 can be prevented from getting out of the area of top-face of the injection unit when it is swing between the retreating position A and the working position B. The swing arm 33 is hollow, and a wire cable (not shown) for connecting the display device 30 to the numerical control device and the like is contained in the arm 33 without being covered with a protective reinforcement tube such as a conduit. The following is the description of the operations of the display device and its peripheral elements arranged in the above-described manner. While the injection molding machine is running, the display device 30 is located in the retreating position A, as indicated by full line in Fig. 2. In this case, the display device 30 is situated inside the front face of the injection unit 20, so that it will not be an obstacle to the operator's various operations around the injection molding machine. Since the display device 30 is supported on the injection unit 20 through the arm 33 and the ball caster 35, the position and attitude of the display device 30 are stable. Besides, the pole 34, being located behind the injection unit 20, will not become hindrance to the operator's operations. The operator monitors the operating state of the injection molding machine with reference to operating information displayed on the CRT screen 31. When the display device 30 is in the retreating position A, the CRT screen 31 faces front for easy monitoring of the operating state. When necessary, the operator can bring the display device 30 to the working position B, which is indicated by broken line in Fig. 2. In doing so, for example, the operator pushes the right-hand side of the display device 30 to make the swing arm 33 to rotate horizontally around the pole 34 until the second arm section 33b of the arm 33 comes to abut against the peripheral surface of the hopper 23. As a result, the display device 30 is located in a position on the side of the mold clamping unit 10 with respect to the hopper 23 or the position where it projects toward the operator from the front face of the injection unit 20. Thus, the CRT screen 31 is not only situated near the operator standing in front of the control panel 13 but also faces the direction for ease of the operator's view. Since the pole 34 is situated at the back of the injection unit 20, it will not hinders the operator in moving the display device 30. The operator performs, for example, mold thickness adjustment operation after mold replacement, with the display device 30 located in the working position B. In this case, relevant information such as the rear platen moving speed displayed on the CRT screen 31 can be confirmed satisfactorily, so that the operator can efficiently perform the operation by manipulating manual buttons, die height button, rear platen advance/retreat button, etc. on the control panel 13. If an emergency stop message or alarm message is displayed on the CRT screen, the operator can quickly cope with this, thereby ensuring safe operation. In some cases, the injection unit 20 may be linearly moved toward or away from the mold clamping unit 10 in order to establish or cancel the nozzle touch state, or the injection unit 20 may be horizontally rotated around the swivel shaft 3, for screw replacement or the like as indicated by dashed line in Fig. 2. In these cases, the injection unit 20 moves smoothly with respect to the display device 30 as the ball caster 35 disposed between the unit and the display device 30 rolls. Even while the injection unit 20 is linearly moving or horizontally rotating, the display device 30 is supported on the pole 34 by means of the swing arm 33, and it is also supported on the injection unit 20 through the ball caster 35. Thus, during the linear movement or horizontal rotation of the injection unit 20 the display device 30 will never become unstable to assure safe performance. Since the pole 34 is situated on the side of the mold clamping unit 10 with respect to the swivel shaft 3 at the back of the injection unit 20, it neither impedes the horizontal rotation and linear movement of the injection unit 20 nor hinders the operator. According to an embodiment, the display device 30 is prevented from getting out of the working position B by means of the hopper 23. Alternatively, however, a stopper may be provided for preventing the deviation. Besides, a stopper for preventing the display device 30 from deviating from the retreating position A may be provided. Furthermore, the lengths of the first and second arm sections 33a and 33b of the swing arm 33 and the bending angle of the swing arm 33 may variedly be selected. More particularly, the position and direction of the CRT screen of the display device 30 in the retreating position A or the working position B may variedly be selected.

Claims: An injection molding machine comprising a pole (34) supporting a swing arm (33) for horizontal rotation above a top face of an injection unit (20), and a display device (30) mounted on an end portion of the swing arm (33) whereby the display device (30) is movable between a retreating position (A) over the injection unit (20) and a working position (B) above but forwardly away from a front face of the injection unit (20), characterised in that: the pole (34) is set up at the back of the injection unit (20) with the swing arm (33) being situated close to the top face of the injection unit (20) and the display device (30) being mounted on the swing arm (33) on the opposite side to the pole (34), and the swing arm (33) has a ball caster (35) located on a lower surface of a middle portion thereof and rollable on the top face of the injection unit (20), whereby the swing arm (33) is supported on the injection unit (20) through the ball caster (35) throughout movement of the swing arm (33) between and at the retreating position (A) and the working position (B) of the display device (30). An injection molding machine according to claim 1, wherein the swing arm (33) is bent toward said display device working position (B) at the middle portion thereof. An injection molding machine according to claim 1 or 2, wherein the pole (34) is situated on the side of a mold clamping unit (10) with respect to a swivel shaft (3) of the injection unit (20), and on a base (1) of the injection molding machine. An injection molding machine according to claim 2, or claim 3 when appended to claim 2, wherein the injection unit (20) comprises a hopper (23) and the bend in the swing arm (33) enables the swing arm (33) to adopt its working position (B) without interfering with the hopper (23).

Inventors: ITO SUSUMU ROOM - FANUC MANSHO, NISHIMURA KOICHI ROOM - FANUC, WATANABE KIKUO ROOM - FANUC MA, ITO, SUSUMU, ROOM 7-204, FANUC MANSHONHARIMOMI, NISHIMURA, KOICHI, ROOM 4-305, FANUC MANSHONHARIMO, WATANABE, KIKUO, ROOM 7-209, FANUC MANSHONHARIMOMI
Applicants: FANUC LTD, FANUC LTD.
Application year: 1991
Main classification: B29C45
IPC codes: B29C45, B23Q1