KR102277399B1 - Pad printer - Google Patents

Abstract

The present invention relates to a pad printer, capable of improving reliability, which comprises: a frame for providing first and second process layouts; a process index table installed in the frame; a plurality of pad printing units installed in the process index table; an overhead mounting plate; and a plurality of press units.

Description

Pad Printing Machine {PAD PRINTER}

The present invention relates to a pad printing machine, and more particularly, to a pad printing machine capable of efficiently printing at least two or more printed objects simultaneously.

Pad printing is a printing method mainly used to print an image or pattern on a complex curved surface or the surface of a fragile product. Engraving is made by forming concave cells or patterns on an image plate or a flat metal plate using etching or electronic engraving. The cell is filled with ink and silver paste, and the ink on the outside of the cell is removed by treatment with a doctor blade. After the ink filled in the cell is immersed in a pad or tampon made of a flexible material such as silicone rubber or rubber, it is transferred and printed on the object to be printed. Pad printing is also called tampon printing.

Korean Patent Registration No. 10-1189752, 'Pad printing device' is provided with a transfer unit for supplying a printed object installed on a base, an ink supply unit for supplying ink, and a pad that elevates to print the object. It consists of a printing module and a cleaning unit that removes the remaining ink from the pad. The transfer unit is composed of a linear stage or a translation stage. After the pad is immersed in ink supplied by the ink cup, the printed object supplied by the operation of the linear stage is printed.

Korean Patent Registration No. 10-1492997, 'Casino Chip Pad Printing Automation Device' is installed in a housing to provide a feeder for supplying casino chips, an input loader for transporting casino chips, and a plurality of casino chips placed therein. A hollow rotary table on which the seating table of the above is installed, an upper surface printing machine installed in the housing to print the upper surface of the casino chips, an inverting machine installed in the housing to reverse the casino chips, and a lower surface printing machine installed in the housing to print the lower surface of the casino chips and an output loader that discharges casino chips. The hollow rotary table sequentially transfers the casino chips placed on each of the seating tables to each process to enable printing by the upper and lower printers. The contents disclosed in the above patent documents are incorporated herein by reference.

Although the pad printing machine as described above can print a plurality of objects continuously, there is a problem of low productivity because a lot of dead time is generated according to the loading and unloading of the objects to be printed. . That is, since the printing of the object to be printed is performed in a one-to-one correspondence with the pads, the number of pads must be increased in order to increase productivity. However, the line layout type pad printer, which prints by printing modules arranged in series while transferring the object to be printed in a straight line or translation, is very difficult to adopt because the structure is complicated and difficult to control to increase the number of pads. there is a problem.

In addition, a pad printer of a circular layout type or a rotary layout type that prints a printed object while rotationally transporting it by an index table or a rotary table controls the index table is implemented by a slip ring, also called a rotary joint or a rotary connector. However, since the slip ring is limited by signal lines, it is difficult to increase the number of loaders, unloaders, pads, and the like, and errors due to noise frequently occur. Accordingly, there is a demand for a pad printing machine capable of printing a plurality of objects and having a simple structure and preventing errors.

The present invention is to solve the problems of the pad printing machine as described above, and it is possible to efficiently print two or more objects by supplying a plurality of objects by a circular layout type, and the structure is simple, and it is possible to prevent errors. An object of the present invention is to provide a new pad printing machine that can

According to one aspect of the present invention, a pad printing machine is provided. The pad printing machine according to the present invention provides a frame providing a first process layout and a second process layout that are continuously arranged to form a circle in a circumferential direction so that two or more objects among a plurality of objects to be printed can be pad-printed at the same time. and; a process index table installed on the frame so as to be rotatable along the first and second process layouts; a plurality of pad printing units installed in the process index table to enable pad printing of two or more objects to be printed; an overhead mounting plate installed above the process index table; and a plurality of press units installed on the overhead mounting plate to operate each of the plurality of pad printing units to perform pad printing of two or more objects to be printed.

In addition, in the pad printing machine according to the present invention, each of the first and second process layouts is performed by operating any one of the plurality of pad printing units by any one of the plurality of press units to operate two or more pad printing units. A printing station for pad printing each printed product, a cleaning station for removing ink remaining in another one of the plurality of pad printing units, and supplying ink to another one of the plurality of pad printing units It consists of an ink supply station. Each of the plurality of pad printing units and the plurality of press units is provided so as to correspond one-to-one to each of the printing station, the cleaning station, and the ink supply station of each of the first and second process layouts. Therefore, it is possible to efficiently perform pad printing of printed matter by a continuous process, thereby improving productivity.

In addition, in the pad printing machine according to the present invention, the frame is made so that two or more objects can be sequentially supplied to each of the first and second process layouts by loading, alignment, standby and unloading of the two or more objects. first and second workpiece transport circular layouts disposed around each of the first and second process layouts; The pad printing machine according to the present invention includes: a first workpiece index table installed in a frame to rotate two or more objects according to a first workpiece transfer circular layout; Second Workpiece Transfer A second work piece index table installed in the frame to rotate two or more objects according to the circular layout; A plurality of alignment fixing devices installed along the upper edge of the first and second workpiece index tables to align and fix two or more objects to be printed are provided. Therefore, it is possible to efficiently perform pad printing by continuously supplying the objects to be printed.

The pad printing machine according to the present invention efficiently prints two or more objects at the same time by operating the pad printing units installed on the process index table and rotatingly transferred to each station by the press units installed in a fixed type, thereby increasing productivity. increase and reduce production costs. In addition, the pad printing machine according to the present invention does not use a slip ring required for controlling actuators for operation of operating devices such as pad printing units installed in a process index table at each station for printing objects to be printed. It is configured to operate the pad printing units which are rotationally transferred to each station by the operation of the process index table by installing the actuators in a fixed type. Therefore, two or more objects can be printed at the same time, and the structure is simple, and there is an effect of improving reliability by preventing errors due to the use of slip rings. In addition, the pad printing machine according to the present invention has the effect of efficiently and effectively performing pad printing by continuously and stably supplying objects to be printed by the operation of the first and second workpiece index tables.

1 is a perspective view showing a pad printing machine according to the present invention.
2 is a front view showing a pad printing machine according to the present invention.
3 is a plan view showing a pad printing machine according to the present invention.
4 is a plan view illustrating a process index table and first and second workpiece index tables in the pad printing machine according to the present invention.
5 is a plan view schematically illustrating the first and second process layouts and the first and second workpiece transfer circular layouts in the pad printing machine according to the present invention.
6 is a perspective view illustrating a process index table, pad printing units, an overhead mounting plate and press units in the pad printing machine according to the present invention.
7 is a perspective view showing the first and second work piece index tables in the pad printing machine according to the present invention.
8 is a front view showing a process index table, first and second workpiece index tables, an overhead mounting plate and press units in the pad printing machine according to the present invention.
9 and 10 are front views illustrating the operation of the pad printing units and the press units in the pad printing machine according to the present invention.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings.

Hereinafter, preferred embodiments of the pad printing machine according to the present invention will be described in detail based on the accompanying drawings.

First, referring to FIGS. 1 to 5 , the pad printer 10 according to the present invention includes a frame 20 and a frame 20 for pad printing at least two or more objects 2 and 4 at the same time. It has a process index table (30) installed so that it can be rotated in the center of the . The to-be-printed objects 2 and 4 may be cover glasses used in mobile devices such as smart phones and tablet computers. The cover glass is also manufactured in a three-dimensional shape in which an edge is bent. Such a cover glass is called a three-dimensional cover glass, edge curved glass, or the like. The pad printing process of the to-be-printed objects 2 and 4 consists of printing, cleaning, and ink supply. The printing process is a process of transferring the ink attached to the pad to the objects 2 and 4 to be printed. The ink supply process is a process of supplying ink to the image plate from the ink cup and then transferring the ink supplied to the image plate to the ink pad. The cleaning process is a process of removing ink remaining on the pad.

4 and 5, the frame 20 is a first process layout in which the frame 20 is continuously arranged to form a circle along the circumferential direction so that at least two objects 2 and 4 can be pad-printed at the same time. (First process layout: S1; S1-1 to S1-3) and a second process layout (Second process layout: S2; S2-1 to S2-3) are provided. Each of the first and second process layouts S1 and S2 includes a printing station (S1-1, S2-1) for pad-printing the objects 2 and 4, and removing ink remaining after pad printing. It is composed of a cleaning station (S1-2, S2-2) and an ink supply station (S1-3, S2-3) for the purpose of cleaning. Each of the stations S1-1 to S1-3 and S2-1 to S2-3 is disposed to face each other, and is disposed at equal intervals to form a circle along the circumferential direction. In some embodiments, the first and second process layouts S1 and S2 and the stations S1-1 to S1-3 and S2-1 to S2-3 may be appropriately increased or decreased according to the pad printing process.

The frame 20 provides first and second workpiece transfer circular layouts S3 and S4 disposed around each of the first and second process layouts S1 and S2, respectively. Each of the first and second workpiece transport circular layouts S3 and S4 is a loading station (Loading station: S3-1, S4-1) for loading the objects 2 and 4, the objects 2 and 4 The alignment station (S3-2, S4-2) for aligning the objects, the first and second print stations (S1-1, S2-1) wait to print the substrates (2, 4) to the pad It consists of a standby station (S3-3, S4-3) and an unloading station (S3-4, S4-4) for unloading the objects 2 and 4 to be printed. Each of the to-be-printed objects 2 and 4 is sequentially supplied to each of the first and second process layouts S1 and S2 through loading, alignment, standby and unloading.

1 to 3, 6 and 7, the process index table 30 is a rotary actuator such as a step motor, a servo motor, a geared motor, etc. 32) rotates and transfers the objects 2 and 4 to a predetermined position according to the process sequence of pad printing. The process index table 30 is also called a rotary index table, a rotary indexing table, and a turntable. Each of the to-be-printed objects 2 and 4 is generated by the rotation of the process index table 30 in the printing station S1-1, S2-1, the cleaning station S1-2, S2-2, and the ink supply station S1- 3, S2-3) are sequentially performed. The process index table 30 is configured to rotate clockwise as shown by arrow "A" in Figs.

1 to 3 and 6 to 10 , the pad printing machine 10 according to the present invention includes a plurality of pad printing units 40 installed at the edge of the process index table 30 . be prepared The pad printing units 40 have six process index tables (eg, one-to-one correspondence with the stations S1-1 to S1-3 and S2-1 to S2-3) of the first and second process layouts S1 and S2, respectively. 30) is installed at equal intervals along the circumferential direction. Each of the pad printing units 40 includes a pad 42 , an up and down plate 44 , a linear motion guide 46 and a return spring 48 .

As clearly shown in FIGS. 8 to 10 , the pad 42 is disposed so as to be able to move up and down under the process index table 30 for pad printing of the objects 2 and 4 . The lifting plate 44 is disposed so as to be lifted above the process index table 30 , and is aligned with the pad 42 in a vertical direction. The linear motion guide 46 connects the pad 42 and the lifting plate 44 to guide the lifting and lowering of the pad 42 and the lifting plate 44 in a linear motion.

The linear motion guide 46 is composed of a guide bar (Guide bar: 46a) and a guide bush (Guide bush: 46b). The guide bar 46a penetrates the process index table 30 and stands vertically, and both ends are connected to the pad 42 and the lifting plate 44 . The guide bush 46b is coupled to the process index table 30 so that the guide bar 46a is inserted and guided. In some embodiments, the linear motion guide 46 may be of a monorail type having a guide rail and a slider mounted to slide along the guide rail. . The return spring 48 applies an elastic force so that the pad 42 and the lifting plate 44 are raised to their initial positions. A bracket 48a is mounted on the upper surface of the process index table 30 . The upper end of the return spring 48 is fixed to the bracket 48a, and the lower end passes through the process index table 30 and is fixed to the pad 42 . The return spring 48 may be configured as a compression coil spring.

1, 2 and 6 to 10, the pad printer 10 according to the present invention includes an overhead mounting plate 50 installed above the process index table 30, On the edge of the overhead mounting plate 50 so as to operate each of the pad printing units 40 disposed in each of the stations S1-1 to S1-3 and S2-1 to S2-3 in a one-to-one correspondence A plurality of installed press units (Press unit: 60) are provided. An overhead mounting plate 50 or an overhead mounting table is supported by a plurality of columns 62 and fixed to the frame 20 . The six press units 60 include a ram plate 62 , a vertical linear actuator 64 , and a plurality of linear motion guides 66 .

The ram plate 62 is disposed so as to be able to move up and down between the lower side of the overhead mounting plate 50 and the upper side of the lifting plate 44 . The vertical linear actuator 64 is mounted on the overhead mounting plate 50 and is connected to the ram plate 62 to elevate the ram plate 62 . The vertical linear actuator 64 may be configured as a pneumatic cylinder 64a of the overhead mounting plate 50 . The pneumatic cylinder 64a has a cylinder rod 64b connected to the ram plate 62 through the overhead mounting plate 50 . In some embodiments, the vertical linear actuator 66 may be configured as a solenoid actuator. In addition, each of the vertical linear actuators 66 is a servomotor, a lead screw, a screw driven linear actuator having a nut block, etc. (Screw driven linear actuator), a pneumatic rodless linear actuator (Pneumatic rodless linear) actuator), a rack and pinion actuator, and the like.

Each of the linear motion guides 66 guides the elevation of the ram plate 62 by the operation of the vertical linear actuator 44 in a linear motion. Each of the linear motion guides 66 is composed of a guide bar 66a and a guide bush 46b. The guide bar 66a penetrates the overhead mounting plate 50 and stands vertically, and the lower end thereof is connected to the ram plate 62 . The guide bush 66b is coupled to the overhead mounting plate 50 so that the guide bar 66a is inserted and guided. In some embodiments, each of the linear motion guides 66 may be of a monorail type having a guide rail and a slider mounted to slide along the guide rail.

1 to 10 , the pad printing machine 10 according to the present invention is installed to be adjacent to the printing stations S1-1 and S2-1, and is provided with at least two printing units by the pad printing units 40 . It further includes first and second workpiece index tables 70 and 80 for sequentially rotating and transporting a plurality of objects 2 and 4 so that the printed materials 2 and 4 can be simultaneously printed. Each of the first and second workpiece index tables 70 and 80 is a process index table 30 to sequentially load and wait the objects 2 and 4 to be printed in each of the print stations S1-1 and S2-1. ) are installed on both sides of the The first and second workpiece index tables 70 and 80, respectively, are first and second workpiece transfer circular layouts S3 according to the process sequence of pad printing by driving the rotary actuators 72 and 82 such as stepper motors. , S4) The objects 2 and 4 are sequentially rotationally transferred to each of the stations S3-1 to S3-4 and S4-1 to S4-4. Each of the first and second workpiece index tables 70 and 80 is configured to rotate in opposite directions as shown by arrows “B” and “C” in FIGS. 4 and 5 . In some embodiments, the first and second workpiece index tables 70 and 80 may be increased or decreased as needed.

A plurality of alignment fixtures 90 are installed on the upper surfaces of each of the first and second workpiece index tables 70 and 80 so as to align and fix each of the objects 2 and 4 to be printed. Each of the four alignment fixing devices 90 is a loading station (S3-1, S4-1), an alignment station (S3-2, S4-2), a standby station (S3-3, S4-3) and an unloading station ( S3-3 and S4-4) are provided at equal intervals at the edges along the circumferential direction of each of the first and second workpiece index tables 70 and 80 so as to correspond one-to-one to each.

Each of the four alignment fixing devices 90 includes a moving stage 92 and a vacuum chuck table 94 mounted above the moving stage 92 . The moving stage 92 may be configured as a U-V-W axis stage having a U-axis and a V-axis and a W-axis orthogonal to the U-axis for aligning the objects 2 and 4, respectively. UVW axis When the stage U-axis is moved, the stage performs translational motion in the X-axis direction. When the V-axis and W-axis are moved at the same time, the stage performs translational motion in the Y direction. motion). In addition, the moving stage 92 may be configured to perform X-Y-Z-axis translational motion and Y-axis rotational motion (Rot Y-axis) or tilting. The vacuum chuck table 94 or vacuum table is a vacuum pump, an air pump, and an air compressor that generate suction force of air for vacuum adsorption of the objects 2 and 4 to be printed. It is connected by a vacuum source such as a compressor) and a pipeline.

1 to 4 , the pad printer 10 according to the present invention includes a workpiece loader 100, an image acquisition device 110 and a workpiece unloader 120. to provide The workpiece loader 100 is installed on the frame 20 so as to be adjacent to each of the loading stations S3-1 and S4-1, and among the alignment fixing devices 90, the loading stations S3-1 and S4-1. ) to load the objects (2, 4) to be printed on the chuck table of any one of the alignment fixing devices arranged in each. The image acquisition device 110 is installed in the frame 20 so as to be adjacent to each of the alignment stations S3-2 and S4-2, and among the alignment fixing devices 90, the alignment stations S3-2 and S4-2 ) to obtain an image of the object (2, 4) placed on the grip chuck table of any one of the alignment fixing device arranged in each and perform positioning of the object (2, 4). The workpiece unloader 120 is installed in the frame 20 so as to be adjacent to each of the unloading stations S3-4 and S4-4, and among the alignment fixing devices 90, the unloading stations S3-4 and S4 -4) unloads the to-be-printed objects 2 and 4 from the vacuum chuck table of any one of the alignment fixing devices arranged in each.

Each of the workpiece loaders and unloaders 100 and 120 is a transfer feeder having an end effector such as a vacuum adsorption device for loading and unloading the substrates 2 and 4 . ), a multi degree of freedom robot, and a handler. The image acquisition device 110 includes a camera 112 that acquires image data by photographing images of the objects 2 and 4, and image data input from the camera 112 by using an image processing program. It consists of a processing computer.

The pad printing machine 10 according to the present invention is installed to be adjacent to each of the cleaning stations S1-2 and S2-2, so that each of the pads of the pad printing units 40 is installed at each of the cleaning stations S1-2 and S2-2. A cleaning device 130 for removing the ink remaining in 42 and the ink supply stations S1-3 and S2-3 are installed adjacent to each of the ink supply stations S1-3 and S2-3 An ink supply device 140 for supplying ink to each pad 42 of each of the pad printing units 40 disposed therein is provided. Each of the pad printing units 40 is operated by the operation of the process index table 30 to each station S1-1 to S1-3, S2-1 to S2-3 of the first and second process layouts S1 and S2. ) are sequentially rotated. The cleaning apparatus 130 cleanly removes the ink remaining on the pads 42 disposed in each of the cleaning stations S1 - 2 and S2 - 2 . The ink supply device 140 supplies ink to the image plate. The pads 42 disposed in each of the ink supply stations S1-3 and S2-3 are lowered to transfer and receive ink from the image plate.

From now on, the operation of the pad printing machine according to the present invention having such a configuration will be described.

1 to 5 , the workpiece loader 100 loads the objects 2 and 4 to the vacuum chuck tables 94 disposed in the loading stations S3-1 and S4-1, respectively. The vacuum chuck table 94 fixes the to-be-printed objects 2 and 4 by vacuum suction. When the objects 2 and 4 are loaded on the hold chuck table 94, each of the first and second workpiece index tables 70 and 80 is rotated by the driving of the rotary actuators 72 and 82 to rotate the object ( 2 and 4) are arranged at each of the alignment stations S3-2 and S4-2. The camera 112 acquires image data of the objects 2 and 4 and inputs them to the computer. The computer processes the image data by the image processing program, and operates the moving stage 92 disposed in each of the alignment stations S3-2 and S4-2 to position the objects 2 and 4 will be carried out When the alignment of the objects 2 and 4 is completed by positioning the objects 2 and 4, the objects 2 and 4 are rotated by rotation of the first and second workpiece index tables 70 and 80. It is disposed in each of the standby stations S3-3 and S4-3.

8 to 9 , when the to-be-printed objects 2 and 4 are placed in each of the standby stations S3-3 and S4-3, each of the press units 60 is operated to operate the pad printing unit 40 lower each of them. When the cylinder rod 64b is advanced by the operation of the pneumatic cylinder 64a, the ram plate 62 is lowered and the lifting plate 44 is pressed. The pad 42 connected by the elevating plate 44 and the guide bar 66a is lowered together with the elevating plate 44 . The lowering of each of the lifting plate 44 and the ram plate 62 is precisely guided in a linear motion by the linear motion guides 46 and 66, respectively. As described above, the pad 42 of each of the pad printing units 40 disposed in each of the printing stations S1-1 and S2-1 is lowered to transfer ink to each of the objects 2 and 4 to be printed. Prints 2 and 4 are printed.

1, 2 and 4 , the ink remaining on the pad 42 descending from each of the cleaning stations S1 - 2 and S2 - 2 is removed by the operation of the cleaning apparatus 130 . The pad 42 lowered at each of the ink supply stations S1-3 and S2-3 transfers the ink supplied to the image plate by the ink supply devices 140 . When pad printing, cleaning, and ink supply are completed by the cooperation of the pad printing units 40 and the press units 60, respectively, the cylinder rod 64b is retracted by the operation of the pneumatic cylinder 64a, and the ram plate (62) is raised and returned to the initial position. When the ram plate 62 is returned, the pad 42 is raised together with the lifting plate 44 by the elastic force of the return spring 48 to return to the initial position.

When the printing of the to-be-printed objects 2 and 4 is completed in each of the print stations S1-1 and S2-1 and the pad printing units 40 and the press units 60 are returned, respectively, the first and second Each of the workpiece index tables 70 and 80 is rotated by the driving of the rotary actuators 72 and 82 to unload the objects 2 and 4 from the standby stations S3-3 and S4-3, respectively. S3-1, S4-1) is transferred to each. The vacuum chuck table 94 disposed in each of the unloading stations S3-1 and S4-1 releases the vacuum suction of the objects 2 and 4 to be printed. The workpiece unloader 120 unloads the objects 2 and 4 placed on the buffer chuck table 94 at each of the unloading stations S3-1 and S4-1.

The embodiment described above is only a description of a preferred embodiment of the present invention, the scope of the present invention is not limited to the described embodiment, and within the technical spirit and claims of the present invention, those skilled in the art Various changes, modifications or substitutions will be possible by, and it should be understood that such embodiments fall within the scope of the present invention.

10: pad printing machine 20: frame
30: process index table 40: pad printing unit
42: pad 44: lifting plate
50: overhead mounting plate 60: press unit
62: ram plate 64: vertical linear actuator
70: first workpiece index table 80: second workpiece index table
90: alignment fixture 92: moving stage
94: hold chuck table 100: workpiece loader
110: image acquisition device 120: workpiece unloader
130: cleaning device 140: ink supply device

Claims (6)

a frame providing a first process layout and a second process layout which are continuously arranged to form a circle along a circumferential direction so as to simultaneously pad-print two or more objects among a plurality of objects;
a process index table installed on the frame so as to be rotatable along the first and second process layouts;
a plurality of pad printing units installed in the process index table to enable pad printing of the two or more objects to be printed;
an overhead mounting plate installed above the process index table;
a plurality of press units installed on the overhead mounting plate to operate each of the plurality of pad printing units to perform pad printing of the two or more objects to be printed;
In each of the first and second process layouts, any one of the plurality of pad printing units is operated by any one of the plurality of press units to perform pad printing of each of the two or more printed materials. a station; a cleaning station for removing ink remaining in another pad printing unit among the plurality of pad printing units; and an ink supply station for supplying ink to another pad printing unit among the plurality of pad printing units. done,
and each of the plurality of pad printing units and the plurality of press units is installed to correspond one-to-one to a printing station, a cleaning station, and an ink supply station of each of the first and second process layouts, respectively. delete delete According to claim 1,
The frame includes the first and second process layouts so that the two or more objects can be sequentially supplied to each of the first and second process layouts by loading, aligning, standby and unloading the two or more objects. providing first and second workpiece transport circular layouts disposed around each;
a first workpiece index table installed on the frame to rotate and transport the two or more objects according to the first workpiece transfer circular layout;
a second workpiece index table installed on the frame to rotate and transport the two or more objects according to the second workpiece transfer circular layout;
and a plurality of alignment fixing devices installed along upper edges of the first and second workpiece index tables to align and fix the two or more objects to be printed. 5. The method of claim 1 or 4,
Each of the plurality of pad printing units,
a pad disposed so as to be raised and lowered below the process index table for pad printing of the two objects to be printed;
an elevating plate disposed above the process index table so as to be elevated by the operation of each of the plurality of press units;
a linear motion guide connecting the pad and the elevating plate to the pad and the elevating plate to guide the elevating and lowering of the pad and the elevating plate in a linear motion;
and a return spring providing an elastic force to lift the pad and the lifting plate to return to an initial position. 6. The method of claim 5,
Each of the plurality of press units,
a ram plate disposed so as to be able to move up and down between the overhead mounting plate and the elevating plate;
a vertical linear actuator mounted on the overhead mounting and connected to the ram plate to elevate the ram plate;
and a plurality of linear motion guides for guiding the lifting and lowering of the ram plate in a linear motion by the operation of the vertical linear actuator.

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