KR100222253B1 - Pad printer - Google Patents

Abstract

The present invention relates to a technique for improving the structure of the cam for accurately maintaining the movement timing of the platen and the printing pad in the pad printer. In the pad printer of the present invention, the cam disk for driving the plate horizontally and the cam disk for driving the printing pad vertically are implemented on both sides of a single cam, thereby simplifying the structure and reducing the size.

Description

Pad printer

TECHNICAL FIELD The present invention relates to a pad printer, and more particularly, to a pad printer having an improved structure of a cam for accurately maintaining the movement timing of an inboard and a printing pad.

In general, a pad printer is a printing pad in which ink is applied to a plate on which a given character, symbol, or figure (hereinafter, collectively referred to as a character) is engraved (or embossed, hereinafter engraved). It refers to an apparatus for printing by imprinting ink transferred to a printing pad on a printing object made of a material such as wood, metal, or plastic, which is transferred to and transferred at the same time.

Conventional typical pad printers are disclosed in detail in US Pat. No. 4,905,594, where FIG. 1 is a front view of a conventional pad printer with its front wall removed, and FIG. 2 is a plan view of a conventional pad printer.

As shown in FIG. 1 and FIG. 2, a conventional pad printer is provided with a main pin 14 across two opposing support side walls 10, 11, which are plated. A first lever 12 for horizontally driving the transfer plate 24 and a second lever 13 for vertically driving the printing pad 27 are rotatably mounted. The first lever 12 is equipped with two support rollers 15 and 16 which interact with respective cam disks 20 and 21 which will be described later, and these support rollers 15 and 16 are The surfaces of the cam discs 20 and 21 are in contact with each other.

A camshaft 19 is also provided across the support sidewalls 10, 11, across which two cam discs 20, 21 are arranged in parallel. Accordingly, the first lever 12 is pivoted back and forth by the cam disks 20 and 21 while the cam shaft 19 rotates. When the cam disks 20 and 21 are properly selected, the first lever 12 is pivoted. It is possible to substantially control the position occupied by the lever 12 at any point in time, further preventing any undesirable movement from occurring.

The lower end of the first lever 12 is formed with a sliding long groove 29 is connected to the plate transfer plate 24 by a bolt. The long groove 29 ensures the fluidity required during the pivoting movement so that the pivoting movement of the first lever 12 can be smoothly converted into the straight movement of the plate transfer plate 24 connected thereto.

On the camshaft 19 further cam disks 22 and 23 are mounted so as to be rotatable, and the cam disks 22 and 23 are supported by the support rollers 17 mounted on the second lever 13. With respect to, 18, the second lever 13 can be driven in a manner similar to that described for the driving manner of the first lever 12.

In the above configuration, by properly selecting the shape and fixing position of the cam disks 20-23, it is possible to accurately lock the phase between the driving operation of the plate transfer plate 24 and the printing pad 27, and as a result, Print jobs are done accurately and smoothly.

In FIG. 1 and FIG. 2, reference numeral 25 denotes a plate mounted on the plate transfer plate 24, 26 denotes an ink container in which printing ink is stored, and 30 denotes a second lever 13 and a printing pad 27. Represents a connecting rod for connecting the reference numeral 28 indicates a guide for guiding the printing pad 27 to move vertically.

When power is supplied to a conventional pad printer having the above-described configuration, a motor (not shown) operates, and the cam disks 20-23 connected through the belt (not shown) rotate. When the cam disks 20-23 are rotated, the first lever 12 is the main pin by the relationship between the pair of cam disks 20, 21 and the pair of support rollers 15, 16. The axis 14 is pivoted and the platen plate 24 starts to be driven horizontally to the left. In this way, as the plate transfer plate 24 is horizontally driven, the ink stored in the ink container 26 is applied to the platen 25, and the platen 25 coated with ink is later horizontally moved to the left for some time. do.

Meanwhile, the second lever 13 also pivots around the main pin 14 by the relationship between the remaining pair of cam disks 22, 23 and the pair of support rollers 17, 18. As a result, the connecting rod 30 starts to be driven vertically downward. In this way, as the connecting rod 30 is vertically driven, the printing pad 27 connected thereto is moved downward, and at a predetermined time point, the connecting rod 30 meets the plate 25 which is moved to the left as shown by a dotted line. Accordingly, the ink applied to the platen 25 is transferred to the printing pad 27, from which the platen 25 moves horizontally to the right while the printing pad 27 is further moved downward by a predetermined distance. Characters are printed on a printing object (not shown) placed directly below the same.

In this way, after the printing of one print object is finished, the printing pad 27 moves upward again to return to the initial position. The above-described series of operations are all in the shape and the fixed position of the cam disc 20-23. It can be achieved without difficulty.

However, in the conventional pad printer having the above-described configuration, two cam disks and support rollers for driving the plate horizontally are used, and two cam disks and support rollers for driving the printing pad are also used. There was a problem that not only the cost is increased but also the manufacturing labor. Furthermore, there was a problem in that the volume and weight increase due to the above-described structure, and in addition, if the fixed shaft of the cam disk is loosened due to the long time use, the phase between the driving plate and the driving operation of the printing pad is disturbed. There is a problem such as incorrect printing position of the

The present invention has been made to solve the above-described problems of the conventional pad printer, by driving the plate and the printing pad using a single cam to reduce the manufacturing cost and manufacturing labor, in addition to the volume and weight can be reduced The purpose is to provide a pad printer.

The present invention for achieving the above object is a plate-mounted plate transfer plate, a first lever for moving the platen plate forward and backward, while the transfer plate is advancing the ink applied to the plate is transferred directly below A pad printer having a printing pad on a printing object placed on a printing object and a second lever for moving the printing pad up and down, the pad printer comprising: a first support roller fixed to a position of the first lever; The second support roller and one surface fixed in place of the second lever is formed with a bent guide groove into which the body of the first support roller is inserted, the other side is formed with a bent guide groove into which the body of the second support roller is inserted. And a double-sided cam for pivoting the first and second support rollers back and forth and up and down, respectively, according to a phase determined by the shapes of the two bent guide grooves during the axial rotation. The first and second levers are driven back and forth and left and right, respectively, by the front and rear and up and down pivot movement force of the support roller and the second support roller.

1 is a front view of a conventional pad printer with its front wall removed.

2 is a plan view of a conventional pad printer.

3 (a) to 3 (c) is a front view showing an operating state at the main time points of the pad printer according to an embodiment of the present invention.

4 is a plan view of the pad printer shown in FIG.

5 is a plan view showing the main portion in FIG.

6 is a side view of the pad printer of the present invention.

7 is a side view showing the main part in FIG.

8 is a front view showing the structure of a double-sided cam according to the present invention.

* Explanation of symbols for main parts of the drawings

10, 11: support side wall 12: first lever

13: second lever 14: main pin

15-18: Supporting roller 19: Camshaft

20-23: Cam disk 24: In plate transfer plate

25: plate 26: ink container

27: printing pad 28: guide

29: ellipse hole 30: connection rod

100: base 110, 120: support side wall

130: wealth stage 132, 134: operation knob

140: print object 200: drive motor

202: motor shaft 204: drive pulley

210: belt 220: support bracket

230: double-sided cam 232, 234: guide groove

240: camshaft 242: driven pulley

250: first lever 252: first rotating shaft

254: first support roller 256: flow hole

260: second lever 262: second rotary shaft

264: second support roller 266: flow groove

270: guide groove 272: guide roller

274: plate transfer 276: plate

278: connecting member 280: ink container

282: Frangipani 284: container fixing groove

290: printing pad 292: connection rod

300: ink container fixing means 302: operation lever

304: lever shaft 306: cam

308: compression spring 310: container fixing rod

312: Information Home

Hereinafter, a pad printer according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 (a) to 3 (c) is a front view showing the operating state at the main points of the pad printer according to an embodiment of the present invention, Figure 4 is a plan view of the pad printer shown in FIG. 5 is a plan view showing the main part in FIG. 1, FIG. 6 is a side view of the pad printer of the present invention, and FIG. 7 is a side view showing the main part in FIG.

First, as shown in FIG. 3 to FIG. 7, in the pad printer of the present invention, a pair of opposing support sidewalls 110 and 120 are installed on the base 100. 110 and 120 support main components constituting the pad printer as described below. Guide grooves 270 are provided horizontally in the middle portion of each of the supporting side walls 110 and 120, and a plurality of guide rollers 272 are mounted on the upper and lower sides of the guide grooves 270, respectively. The guide groove 270 is inserted into the plate transfer plate 274 is mounted on the plate 276 is engraved with the character to be printed at the front end. The rear end of the plate transfer plate 274 is provided with a connection member 278 for connection with the first lever 250 to be described later. On the upper surface of the plate 276, the ink container 280 for storing the ink to be applied to the plate 276 is placed on a predetermined position and then pressed and fixed by the container fixing rod 310 to be described later. In the above-described configuration, the plate conveying plate 274 is to be moved left and right (hereinafter also referred to as forward and backward movement or horizontal movement depending on time) when the guide roller 272 is plated Smooth the horizontal movement of the transfer plate 274, and further serves to prevent the vertical flow.

The first lever 250 is responsible for driving the platen plate 274 horizontally. One side end (hereinafter, referred to as a fixed end) of the first lever 250 is axially fixed to the first rotation shaft 252 installed across the upper ends of the support sidewalls 110 and 120, and the other end ( Hereinafter, the flow stage) is connected to the connection member 278 to allow a certain amount of vertical flow. The first support roller 254 is mounted in place on the back of the first lever 250, the body of the first support roller 254 is formed in the guide groove 232 bent in front of the double-sided cam 230; , Called a front guide groove).

The second lever 260 is responsible for vertically driving the printing pad 290. One end (hereinafter, referred to as a fixed end) of the second lever is fixed to the second rotation shaft 262 installed across the upper end of the supporting side walls 110 and 120, and the other end (hereinafter, referred to as flow). Stage) is connected to the connecting rod 292 extending from the printing pad 290 to allow a certain amount of left and right flow. The second support roller 264 is mounted in place in front of the second lever 260, the body of the second support roller 264 is formed in the guide groove 234 bent to the rear of the double-sided cam 230; It is inserted into the back guide groove).

On the other hand, the printing pad 290 is preferably made by solidifying the liquid silicone.

The double-sided cam 230 pivots the first support roller 254 and the second support roller 264 to horizontally and vertically drive the first and second levers 250 and 260 related thereto. In charge. The double-sided cam 230 is fixed to the left side (based on FIG. 4) of the rotating shaft 240 (hereinafter referred to as a cam shaft) installed across the upper ends of the supporting side walls 110 and 120. A driven pulley 242 is fixed to the right side of the camshaft 240 (based on FIG. 4), and is driven by a geared motor 200 whose rotational speed is appropriately reduced by a gear at the rear of the driven pulley 242 in a straight line. The drive pulley 204 is provided. The driving pulley 204 and the driven pulley 242 are connected by the belt 210 so that the rotational force of the driving pulley 204 is transmitted to the driven pulley 242.

Fixing the ink container for fixing the ink container 280 in a predetermined position in addition to promoting smooth vertical driving of the printing pad 290 in place on the left side of the supporting sidewalls 110 and 120 (see FIG. 3). Means 300 are mounted. Ink container holding means 300 is the operating lever 302, the cam 306 fixed to the other end of the axis of the operating lever 302, the ink container fixing rod 310 and the operating lever 302 is its "fixed position" When it is operated to the container fixing rod 310 is made of a compression spring 308 to apply the elastic force to the free end of the container fixing rod 310 is inserted into the container fixing groove 284 of the ink container 280. . In the above-described configuration, when the operation lever 302 has been operated to its "release position", the container fixing rod 310 is moved upward by the cam 306, whereby the fixing of the ink container 280 is released. The fixing means 300 is also formed with a guide groove 312 for guiding the vertical movement of the connecting rod 292.

A vertical stage 130 for fixing the printing object 140 is installed below the printing pad 290, and the upper end of the stage 130 is provided at a position relatively lower than the upper end of the plate 276. Reference numerals 132 and 134 denote operation knobs for fixing the printing object 140 on the stage 130, respectively. Reference numerals 256 and 266 denote flows for smoothly converting the rotational motions of the first lever 250 and the second lever 260 into linear motions of the plate transfer plate 274 and the connecting rod 292 connected thereto. Represents holes and flow grooves.

In the above-described configuration, the bending of the front guide groove 232 and the rear guide groove 234 of the double-sided cam 230 is a step of applying the ink to the platen 276, printing pad (printing the ink applied to the platen (276) ( The step of transferring to 290 and the retraction of the platen 276 and the step of taking the printing pad 290 onto the object to be printed 140 are appropriately selected so as to be continuously performed at an accurate timing.

Hereinafter, the operation of the pad printer of the present invention having the above configuration will be described in detail.

8 is a front view showing the structure of a double-sided cam according to the present invention. 8 shows the front guide groove 232 viewed from the front of the double-sided cam 230, and the portion shown with the dotted line shows the rear guide groove 234 seen from the rear of the double-sided cam 230. Arrows indicate the rotational direction of the double-sided cam 230. Furthermore, the letters a to d represent the relative positional relationship between the front guide groove 232 and the first support roller 254 while the double-sided cam 230 rotates, and the letters h to m indicate that the double-sided cam 230 rotates. While the relative positional relationship between the back guide groove 234 and the second support roller 264 synchronized with the position ⓐ to position ⓓ is shown.

First, the operator mounts the plate 276 in which the character to be printed is engraved on the plate transfer plate 274, and mounts the ink container 280 containing ink at a predetermined position in advance. The lever 302 must be operated to fix the ink container 280.

On the other hand, the printing object 140 is fixed at a predetermined position on the stage stage 130 for each time period required for printing of the printing object 140 by a conveyor belt (not shown), etc., the printing object 140 is finished printing ) May be automatically removed from the stage 130. Of course, the fixing of the object 140 to the material stage 130 may be manually performed by the operation knobs 132 and 134.

In this way, when the operator inputs power to the machine in a state in which the preliminary work for printing is finished, the rotating shaft 202 of the driving motor 200 starts to turn. Next, when the rotating shaft 202 of the drive motor 200 is rotated, the rotational force generated at this time is transmitted to the cam shaft 240 via the driving pulley 204, the belt 210, and the driven pulley 242 sequentially, thereby making both sides. Cam 230 is rotated.

At the time when the double-sided cam 230 starts to rotate, the first support roller 254 is placed at an approximately position ⓐ on the front guide groove 232, while the second support roller 264 is the rear guide groove 234. It is approximately in the position ⓗ in the image. Accordingly, as shown in FIG. 3 (a), the first lever 250 and the platen plate 274 are in a retracted state, and the second lever 260 and the printing pad 290 are in an upward movement state. .

When the camshaft 240 continues to rotate in this state, the radius of the front guide groove 234 gradually decreases to the position ⓑ, and then the plate transfer plate 274 maintains the same radius from the position ⓑ to the position ⓒ. As shown in FIG. 3 (b), after advancing to the forward state, the forward state is held for a predetermined time. In the process of advancing the plate transfer plate 274, the ink stored in the ink container 280 is applied to the plate 276.

On the other hand, during a similar time, the radius of the rear guide groove 234 gradually decreases up to the position ⓘ and then gradually increases from this position ⓘ to the position 다시 again. Therefore, as shown in FIG. 3 (b), the printing pad 290 is mounted on the plate transfer plate 274 and contacts the platen 276 which is waiting to receive the ink applied to the platen 276. After that, it rises again.

Next, the front guide groove 232 gradually increases its radius from the position ⓒ to the position ⓓ and maintains the same radius from the position ⓓ to the initial position ⓐ. Accordingly, the plate transfer plate 274 retreats while the cam shaft 240 rotates from the position ⓒ to the position ⓓ, and maintains the retracted state while the cam shaft 240 rotates from the position ⓓ to the position ⓐ.

On the other hand, the rear guide groove 234 has a sharp decrease in radius from the position ⓙ to the position ⓚ relative to the angle, while the radius is gradually reduced from the position ⓚ to the position ⓛ relative to the angle. Therefore, the rotational angular velocity of the second support roller 264, that is, the descending speed of the printing pad 290, is also converted from high speed to low speed before and after the time occupied by the position?. The reason why the rear guide groove 234 of the double-sided cam 230 is formed in this way is to prevent bleeding of ink which may occur when the printing pad 290 is contacted with the printing object 140 at a high speed (or a constant medium speed). To prevent it. That is, the printing pad 290 is lowered at a relatively high speed while the double-sided cam 230 rotates from position ⓙ to position ⓚ, and lowered at a relatively low speed while the double-sided cam 230 rotates from position ⓚ to position ⓛ. do. In this way, at the time when the lowering of the printing pad 290 is completed, the printing pad 290 is pressed on the printing object 140 as shown in FIG. 3 (c) to print on one printing object 140. Will end.

In this way, the radius from the position ⓛ to the position ⓜ of the rear guide groove 234 is gradually increased at the time when the printing of one print object 140 is finished, and the same radius is maintained from the position ⓜ to the initial position ⓗ. . Thus, the printing pad 290 returns to the initial raised state while the camshaft 240 rotates from position ⓛ to position ⓜ, and this raised state while the camshaft 240 rotates from position ⓜ to the initial position ⓗ. Will be maintained.

The pad printer of the present invention is not limited to the above-described embodiments and can be modified in various ways within the scope of the technical idea of the present invention.

For example, in the above-described embodiment, the first and second rotation shafts are biaxial, but they may be installed coaxially.

According to the pad printer of the present invention as described above, by driving the plate and the printing pad using a single cam, it is possible to reduce the manufacturing cost and manufacturing man-hours, and to reduce the volume and weight, in addition to long-term use Due to this, even if the camshaft becomes loose, since the relative positions of the front guide grooves and the rear guide grooves do not change, there is an effect that the printing position on the print object does not change.

Claims (4)

An inboard transfer plate mounted on a platen, a first lever for moving the platen plate forward and backward, a printing pad which transfers the ink applied to the platen while the platen plate moves forward and places it on a printing object placed directly below the plate; A pad printer having a second lever for moving a printing pad up and down, the pad printer comprising: a first support roller fixed in place of the first lever; The second support roller and one surface fixed in place of the second lever is formed with a bent guide groove into which the body of the first support roller is inserted, the other side is formed with a bent guide groove into which the body of the second support roller is inserted. And a double-sided cam for pivoting the first and second support rollers back and forth and up and down, respectively, according to a phase determined by the shapes of the two bent guide grooves during the axial rotation. A pad printer, characterized in that printing is carried out on a print object by driving the first lever and the second lever forward, backward, left and right, respectively, by front, rear, and top and bottom pivot movement forces of the support roller and the second support roller. The pad printer according to claim 1, further comprising a plurality of guide rollers installed above and below the guide groove on which the plate transfer plate slides to smoothly move the plate transfer plate. The curved guide groove of claim 1 or 2, wherein the curved guide groove associated with the second support roller moves at a relatively high speed in the first half while the printing pad is lowered to photograph the transferred ink on a printing object. The pad printer, characterized in that the shape is determined so as to move at a relatively low speed during the lower half. The pad printer of claim 3, wherein the printing pad is formed by solidifying liquid silicone.

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