JP2005074885A - Radiator for impact dot head, manufacturing method for the same, impact dot head, and printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiator for an impact dot head excellent in a radiating property. <P>SOLUTION: The radiator 3 of the impact dot head 1 is an aluminum forging integrally constituted of a cup type radiating body 30, radiating fins 33 provided on an outer circumference 31a of the cylindrical drum 31, and a heat collecting projection 34 provided on the inner section thereof are integrally formed. A groove 33a is formed on each of the radiating fins 33 at the same portion in a view along a direction of movement of the head. The heat collecting projection 34 is positioned on a gap between driving coils as heating sources of the head section 2. The radiator 3 has a good heat radiating property because the radiator 3 is made of an integrated forging. The generated heat is efficiently radiated by the heat collecting projection 34. As an air flows through the grooves 33a when the head 1 is moved, the heat radiating effect by the radiating fins 33 can be enhanced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a radiator for an impact dot head, and more particularly to a structure and manufacturing method of a radiator with excellent heat dissipation, an impact dot head including the radiator, and a printer including the impact dot head. .

  The impact dot head, which is widely used as a print head for printers, drives a printing wire arranged in a matrix form by an electromagnetic drive mechanism, and causes the leading end surface of the printing wire to collide with recording paper via an ink ribbon. Then, printing is performed by transferring the ink dots onto the recording paper. The electromagnetic drive mechanism generates heat when energized to the drive coil, and the drive characteristics deteriorate when the electromagnetic drive mechanism falls into an overheated state. Therefore, the impact dot head is provided with an aluminum radiator having excellent heat dissipation so that the generated heat can be efficiently released to the outside. The following Patent Document 1 discloses an impact dot head having a radiator (cover). Generally, in order to improve the heat dissipation of the radiator, a heat dissipating component such as a heat dissipating fin is attached to the outer peripheral surface or end surface of the cup-shaped heat dissipating body.

Conventionally, the radiator of such an impact dot head is generally an aluminum drawn product or die cast product. It is also known that a radiator is an injection molded product. For example, in Patent Document 2 below, polyacetal is used to form aluminum in order to integrally form a carriage for guiding an impact dot head in the print width direction. The heat radiator is injection molded by using the injection molding material mixed in.
JP-A-9-123485 JP-A-5-221940

  When the impact dot head radiator is a drawn product, secondary processing such as cutting and deburring is necessary, and there is a problem that the degree of freedom in shape is low. In the case of die-cast products, thermal conductivity decreases due to the formation of nests, strength and material density are low, thin wall processing (weight reduction) is difficult, and die life is short compared to presses. There are problems such as long time, secondary processing such as sizing and deburring is necessary, and it is difficult to form a fine shape.

  Next, since heat dissipation is improved by attaching a heat dissipation member such as a separately manufactured heat dissipation fin to the outer peripheral surface or end surface of the cup-shaped heat dissipating body in the past, compared with the case of integrally forming the heat dissipation fin etc. The heat dissipation is bad. Although it is conceivable to integrally mold a heat radiation fin or the like using an injection molding material as disclosed in Patent Document 2, the thermal conductivity of such an injection molding material is lower than that of a metal material, which is satisfactory. The heat dissipation should not be obtained.

  An object of the present invention is to propose an impact dot head radiator having excellent heat dissipation, a method of manufacturing the radiator, an impact dot head including the radiator, and a printer including the impact dot head. .

The radiator of the impact dot head of the present invention is
A radiator body including a cylindrical body and an end plate portion sealing one end of the cylindrical body,
A heat dissipating protrusion and / or a heat dissipating concavo-convex part formed on the outer peripheral surface of the cylindrical body and / or the outer surface of the end plate portion;
The radiator main body, the heat dissipation protrusion and / or the heat dissipation uneven portion are integrally formed by forging a blank made of aluminum.

  In the present invention, a radiator in which a heat dissipation protrusion and a heat dissipation uneven portion are integrally formed by forging is manufactured. Therefore, compared with the case where a heat dissipation protrusion or the like is manufactured as a separate member and attached to the radiator, the manufacture is easy and the heat dissipation can be improved. In addition, since it is manufactured by forging, unlike the case of a drawn product or a die-cast product, there is an advantage that secondary processing is basically unnecessary and the degree of freedom in shape is high.

  Here, a plurality of heat dissipation protrusions protruding in the same direction from the outer peripheral surface of the cylindrical body portion are formed as the heat dissipation protrusions, and the heat dissipation protrusions are arranged at a predetermined interval in the moving direction of the impact dot head. In addition, it is desirable to form grooves or notches at the same position when viewed along the direction of movement of the impact dot head in each heat dissipation protrusion. When the impact dot head moves in the print width direction, air flows through the grooves or notches of the heat dissipation protrusions, and heat is efficiently radiated from the heat dissipation protrusions.

  In the present invention, a heat radiation protrusion having a shaft hole for passing a carriage guide shaft for guiding the impacted dot head in the print width direction may be formed on the outer peripheral surface of the cylindrical body. The heat dissipation protrusion of this configuration functions as a carriage and contacts the carriage guide shaft directly or via a bearing. Therefore, heat generated from the impact dot head is efficiently transferred to the outside by heat conduction from the heat sink to the carriage shaft side. Can be released.

  Furthermore, in the present invention, a heat collecting protrusion protruding from the inner surface of the end plate portion or the inner peripheral surface of the cylindrical body portion is formed, and the heat collecting protrusion is also integrally formed when the blank is forged. Can be. Since the electromagnetic drive mechanism of the impact dot head is housed inside the radiator, heat generated by the impact dot head can be generated by forming a heat collection protrusion adjacent to the drive coil that is the heat source. It can be efficiently discharged to the outside through a radiator.

  Next, the present invention relates to an impact dot head and is characterized by including the heat radiator having the above-described configuration.

  The present invention also relates to a printer, and is characterized by having an impact dot head including the heat radiator having the above-described configuration.

On the other hand, the present invention provides a radiator body including a cylindrical body and an end plate portion that seals one end of the cylindrical body, and a heat dissipation protrusion formed on the outer peripheral surface of the cylindrical body. A method of manufacturing a radiator for an impact dot head having
Provided with a blank made of aluminum provided with a part corresponding to the cylindrical body part and the end plate part, the part of the cylindrical body part where the projection for heat dissipation is formed is thick,
Put the core for deformation prevention inside the blank,
The blank in this state is forged from both sides of the cylindrical body using a split die,
A part of the blank material is extruded into a meat relief corresponding to the heat dissipation protrusion formed on one of the split molds, and the heat dissipation protrusion is integrally formed.

  In the manufacturing method of the present invention, the blank is prevented from being deformed by using the core, and the blank material is extruded from the thick portion of the outer peripheral surface of the blank to integrally form the heat dissipation protrusion. Therefore, the heat dissipation protrusion can be integrally formed with high accuracy.

  In the present invention, a pair of the heat dissipation protrusions extending in the same direction is formed by forging, and shaft holes for passing the carriage shaft are formed in the heat dissipation protrusions by punching. In the case of injection molding or die casting, shaft holes are different or bent easily. In addition, it is difficult to correct the bending of a hole or a passage when making a hole by secondary processing. According to the present invention, since the shaft holes are formed in the pair of heat dissipation projections, the shaft holes can be formed with an accuracy corresponding to the mold accuracy.

  The heat radiator of the impact dot head according to the present invention has a structure in which heat radiation protrusions and heat radiation uneven portions are integrally formed by forging. Therefore, since the thermal conductivity is greatly improved as compared with the case where the heat dissipation protrusion is manufactured as a separate part and attached to the radiator body, the heat dissipation can be improved. Moreover, since it is a forged product, there are advantages that the heat-dissipation protrusion can be formed with high accuracy and the degree of freedom of its shape is high.

  In the impact dot head and printer provided with the heat radiator of the present invention, it is possible to avoid or suppress adverse effects such as the impact dot head falling into an overheated state, causing dot omission, etc., and degrading print quality.

  Next, according to the manufacturing method of the radiator of the present invention, since the blank material is pushed out from the outer peripheral surface in a state where no deformation occurs in the cylindrical blank using the core, the heat dissipation protrusion is formed. Such heat-dissipating protrusions can be simultaneously formed with high accuracy. Further, since the shaft hole of the carriage guide shaft is simultaneously processed in the heat dissipation projection, the shaft hole can be formed with high accuracy.

  Hereinafter, a radiator of an impact dot head to which the present invention is applied will be described with reference to the drawings.

  FIG. 1 is a sectional view of an impact dot head mounted on a serial type printer, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a perspective view of the radiator. The impact dot head 1 has a head portion 2 and a radiator 3 attached to the head portion 2. The head portion 2 passes through the center of a cup-shaped head frame 4 opened to the rear side, an electromagnetic drive mechanism 5 incorporated in the head frame 4, and a disc-shaped end plate portion 4 a of the head frame 4. A plurality of printing wires 6 projecting forward and a nose portion 7 covering the printing wires 6 are provided. Nine of the printing wires 6 are arranged, for example, and the tip end portions thereof are arranged in a matrix at a narrow interval, and the rear end portions thereof are arranged concentrically at equiangular intervals.

  The electromagnetic drive mechanism 5 includes nine fixed core portions 4c formed at equal angular intervals on the end plate portion 4a of the head frame 4 made of a ferromagnetic material, and a cylindrical drive coil attached to each fixed core portion 4c. 8, a movable core 9 made of ferromagnetic material fixed to the working plate 14 and arranged to be movable with respect to each fixed core portion 4c, and a holding plate 18 made of ferromagnetic material.

  A drive current is supplied to each drive coil 8 via a current supply connector 13 attached to a substrate 12 laminated on the surface side of the end plate portion 4 a of the head frame 4 via a spacer 11. When power is supplied to the drive coil 8, a magnetic attractive force is generated, and the movable iron core 9 is attracted toward the fixed iron core portion 4c. The movable iron core 9 is attached to the outer peripheral end of the operation plate 14, and the rear end of each printing wire 6 is connected to the inner peripheral end of the operation plate 14 via a wire pin 15 and a return spring 16.

  The outer end portion of each actuating plate 14 is pressed against the holding plate 18 disposed on the front side by the claw 17 a of the holding plate 17, and the pressing force is applied by the leaf spring 19. Therefore, the operating plate 14 can swing back and forth at the inner peripheral end with the outer peripheral end as a fulcrum. Therefore, when the movable iron core 9 is sucked, the wire pin 15 is struck through the operation plate 14, the printing wire 6 fixed to the wire pin 15 protrudes forward, and the leading end surface of the ink ribbon (not shown) And the ink dots are transferred to the recording paper.

  The nose portion 7 of the head portion 2 includes a disk-like flange 7 a located in front of the substrate 12. On the left and right portions of the outer peripheral surface of the disk-shaped flange 7a, there are formed projections 7b for fixing the radiator. Further, a center shaft 7c protrudes rearward from the center of the rear end surface of the disk-shaped flange 7a.

  From the rear side of the head portion 2 having this structure, a cup-shaped radiator 3 opened forward is attached, and covers the outer periphery and the rear side of the head portion 2. The radiator 3 is a forged product made of aluminum, and includes a cylindrical body 31 that surrounds the head frame 4 and a radiator body 30 that includes an end plate portion 32 that seals the rear end of the cylindrical body 31. Four plate-like heat radiation fins 33 projecting from the outer peripheral surface 31a of the cylindrical body 31 and nine triangular prism-shaped projections 34 projecting forward from the inner surface of the end plate portion 32. And. At the center of the end plate portion 32, a positioning center hole 32a into which the end of the central axis 7c of the head portion 2 is inserted is formed. Further, fastening protrusions 35 a and 35 b are formed on the left and right portions of the cylindrical body 31 on the opening edge side. The radiator 3 is attached to the head portion 2 so that the center hole 32a of the end plate portion 32 of the radiator 3 coincides with the center axis 7c, and the projection 7b is inserted through the fastening projections 35a and 35b, and these fastenings are performed. The radiator 3 is fixed to the head portion 2 by plastically deforming and tightening the projections 35a and 35b.

  Here, the heat radiating fins 33 of the heat radiator 3 are formed on the outer peripheral surface portion of the cylindrical body portion 31 located on the upper side in a state of being attached to the head portion 2, and extend in parallel upward. The impact dot head 1 extends in a direction orthogonal to the moving direction (printing width direction). Further, they are arranged at regular intervals in the moving direction. Furthermore, each radiating fin 33 is formed with a groove 33a formed by notching backward from its front edge. The grooves 33a of the heat radiation fins 33 are formed at the same position when viewed along the moving direction of the impact dot head 1. On the other hand, nine heat collecting projections 34 formed inside the radiator 3 are formed between the drive coils 8 of the head portion 2 and the inner peripheral surface of the cylindrical body portion 4 b of the head frame 4. It is arranged so that it is located in the 9 gaps.

  In the impact dot head 1 configured as described above, the radiator 3 attached to the impact dot head 1 is made of an aluminum forged product in which the radiator fins 30 and the heat collecting projections 34 are integrally formed with the radiator body 30. . Since the heat radiating fins 33 and the heat collecting projections 34 are integrally formed, the heat dissipation of the radiator 3 is improved as compared with the case where these are manufactured and attached as separate parts. Further, the radiation fins 33 are arranged along the moving direction of the impact dot head 1, and grooves 33 a are formed at the same position when viewed along the moving direction. Therefore, when the impact dot head 1 moves, air flows through the groove 33a, so that the heat radiation effect by each heat radiation fin 33 can be enhanced. Furthermore, heat collection protrusions 34 are formed inside the radiator 3 so as to be positioned in the gaps between the drive coils 8 that are heat sources of the head unit 2. By disposing the heat collection protrusion 34 adjacent to the heat generation source, the generated heat can be efficiently released to the outside of the head unit 2 through the heat collection protrusion 34. Therefore, if the radiator 3 of this example is used, the heat generated in the head unit 2 can be released very efficiently.

  In the present embodiment, the heat collection protrusion 34 is protruded forward from the inner surface of the end plate portion 32, but the heat collection protrusion is formed so as to protrude from the inner peripheral surface of the cylindrical body 31. In this case, since the collected heat is easily transmitted to the cylindrical body 31 having a high heat dissipation effect, the heat dissipation effect can be further improved. In this case, the cylindrical body portion 31 may be deformed inward to form the heat collecting projection.

  In addition, since the radiator 3 is a forged product, it has a higher degree of molding flexibility than a drawn product or a die-cast product, and the heat-radiating fins 33 and the heat collecting projections 34 can be formed with high accuracy, and secondary processing is also fundamental. There is an advantage that it becomes unnecessary.

  Furthermore, since the heat radiating fins 33 are integrally formed with the radiator 3, the number of parts can be reduced and the assembling cost for the integration becomes unnecessary, so that the cost can be reduced.

(Another example of a radiator)
4 is a perspective view showing an example of a radiator that can be used in place of the radiator 3 described above, FIG. 5 is a perspective view when viewed from the opposite side, and FIG. 6 is an impact with the radiator attached. It is a perspective view which shows a dot head. The basic structure of the radiator 3A of this example is the same as that of the radiator 3 described above, except that the heat collection protrusion 34 is not provided and a pair of heat dissipation protrusions 36 and 37 that function as a carriage are integrally formed. Is different. Therefore, common parts are denoted by the same reference numerals, and descriptions thereof are omitted.

  The radiator 3A is also a forged product made of aluminum, and on the outer peripheral surface 31a of the cylindrical body 31 of the radiator body 30, four radiating fins 33 extending in parallel upward are formed on the upper portion thereof, A pair of heat radiation projections 36 and 37 extending in parallel downward is formed on the side portion. Circular shaft holes 36a and 37a for passing a carriage guide shaft (not shown) are formed at the lower end portions of the heat radiation projections 36 and 37.

  When the heat dissipating protrusions 36 and 37 functioning as a carriage are formed integrally with the radiator 3A, the heat dissipating protrusions 36 and 37 are in contact with the carriage guide shaft directly or via a bearing. Therefore, heat is released by heat conduction from the radiator 3A to the carriage guide shaft side through the heat dissipation protrusions 36 and 37. Therefore, the heat generated by the impact dot head can be efficiently released to the outside.

  Next, FIGS. 7 and 8 are perspective views showing another example of a radiator that can be used in place of the radiator 3. Similarly to the radiator 3, the radiator 3 </ b> B illustrated in FIG. 7 includes a cup-shaped radiator body 30 including a cylindrical body portion 31 and an end plate portion 32 that seals one end thereof. However, the heat-radiating fins 33 and the heat-collecting protrusions 34 are not provided, and instead, four parallel heat-dissipating protrusions 38 having a rectangular cross section are formed on the outer surface 32 b of the end plate portion 32. These heat radiation protrusions 38 extend in parallel to the moving direction (printing width direction) of the impact dot head. When the heat dissipation protrusions 38 are formed in this way, air flows through the gaps 39 of the heat dissipation protrusions 38 when the impact dot head is moved, so that the heat dissipation effect of the heat dissipation protrusions 38 can be enhanced.

  The heat radiator 3C shown in FIG. 8 has a structure in which a plurality of cylindrical heat radiation pins 41 extending perpendicularly from the outer surface 32b of the end plate portion 32 are formed instead of the heat radiation projections 38. The other configuration is the same as that of the radiator 3B.

  On the other hand, FIG. 9 is a perspective view showing still another example of a radiator that can be used in place of the radiator 3. Similarly to the radiator 3, the radiator 3 </ b> D also includes a radiator body 30 including a cylindrical body portion 31 and an end plate portion 32 that seals one end thereof. However, it does not include the heat radiating fins 33 and the heat collecting projections 34, but instead has a structure in which a plurality of columnar heat radiating pins 42 protrude upward from the upper portion of the outer peripheral surface of the cylindrical body 31. It is said that. When viewed along the impact dot head movement direction (printing width direction), the heat radiation pins 42 are arranged in three rows of four each, and there are gaps extending in the movement direction between the rows. It has become. Even in this configuration, when the impact dot head moves, air flows between the three rows of the heat radiation pins 42, and the heat radiation efficiency of each heat radiation pin 42 can be increased.

(Manufacturing method of radiator 3D)
Next, an example of a manufacturing method of the radiator 3D having the structure shown in FIG. 9 will be described. First, a blank 50 having the shape shown in FIG. 10 is punched from an aluminum material. The blank 50 has a cup-like shape including a cylindrical body 51 having a shape corresponding to the cylindrical body 31 of the radiator 3D as the final product and an end plate portion 52 having a shape corresponding to the end plate portion 32. It is. However, the cylindrical body portion 51 of the blank 50 is formed with a thick portion 51a for forming the heat radiation pin 42 in a part thereof.

  Next, as shown in FIG. 11, the core 60 is inserted into the blank 50 before the blank 50 having this shape is set in the forging press. The core 60 has a cylindrical shape as a whole, and has a size that fits just into the blank 50. The inner peripheral surface 51b of the blank 50 is preferably provided with a core draft gradient of about 1 to 2 ° toward the opening end. Further, a screw hole 60a used for extracting the core 60 after press forging is formed on the end surface of the core 60.

  Thereafter, as shown in FIG. 12, the blank 50 is set in the forging press 70. The press device 70 is a split mold composed of an upper mold 71 and a lower mold 72, and the upper mold 71 includes a punch 73 having a semicircular mold surface and punches 74 disposed on both sides thereof, and a stripper plate 75. Can be moved up and down. The lower die 72 is supported by a push-up plate 77 in a state where it can be moved up and down along the die plate 76 on the fixed side. The push-up plate 77 is supported by the backing plates 78 and 79 so as to be lifted and lowered, and can be lifted and lowered by a lift mechanism 81 via push-up pins 80. In addition, on the semicircular mold surface of the lower mold 72, a meat relief 82 for forming the heat radiation pin 42 is opened, and each meat relief 82 extends vertically downward from the mold surface. The bottom of each meat relief 82 is defined by a knock auxiliary pin 83, and the knock auxiliary pin 83 is supported by a push-up plate 77 via a push-up spring 84. The blank 50 is set in the lower mold 72 in a state where the blank portion 50 is horizontally placed and the thick portion 51a faces downward.

  Thereafter, as shown in FIG. 13, the upper die 71 is lowered and the blank 50 is pressed. As a result, the cylindrical body portion 51 of the blank 50 has a shape corresponding to the cylindrical body portion 31 of the radiator 3D that is the final molded product, and the meat of the thick portion 51a of the cylindrical body portion 51 becomes the meat escape 82. 42 A of pin parts corresponding to the heat radiating pin 42 are extruded and formed simultaneously. Here, since the core 60 is inserted into the blank 50, the cylindrical body portion 51 is not deformed, so that the pin portion 42A can be simultaneously and reliably formed with high accuracy. Further, at the time of forging, the pin portion 42A is freely unpinned without restricting the length of the pin portion 42A. This is because if it is restricted, burrs may occur on the parting surface L.

  After press forging, the mold is opened, the forged product 70 is taken out, and the core 60 is pulled out therefrom. Thereafter, the pin portion 42A is trimmed to a predetermined length to obtain the heat radiator 3D as the final product.

(Manufacturing method of radiator 3A)
Next, in manufacturing the radiator 3A shown in FIG. 5, it is desirable to form the shaft holes 36a and 37a of the carriage guide shaft simultaneously after press forging. For example, a cam-type drilling mechanism 90 as shown in FIG. 14 can be used. The drilling mechanism 90 has a pair of left and right cam units 91 and 92 and punches 93 and 94 driven by the cam units 91 and 92, respectively. The punches 93 and 94 can project through punch plates 95 and 96, respectively. Projection portions 36A and 37A corresponding to the pair of left and right heat radiation projections 36 and 37 formed simultaneously by press forging are strippers made of urethane rubber. The plate is pressed against the die 99 by the punch plates 95 and 96 through the plates 97 and 98. In this state, the punches 93 and 94 are driven, and shaft holes are punched into both the projecting portions 36A and 37A. If the shaft holes 36a and 37a are formed at the same time in this way, the shaft hole can be formed with high accuracy without causing hole bending or passing.

  Further, the heat radiating fins 33 of the heat radiator 3A are protruded from the cylindrical body 31 by the same manufacturing method as the heat radiating pins 42 of the heat radiating device 3D, and then the heat radiating fins 33 are pressed from behind to form the grooves 33a. It can be manufactured by forming.

It is sectional drawing of the impact dot head provided with the heat radiator to which this invention is applied. It is a disassembled perspective view of the impact dot head of FIG. It is a perspective view of the heat radiator of FIG. It is a perspective view which shows another example of a heat radiator. It is a perspective view at the time of seeing the heat radiator of FIG. 4 from the other side. It is a perspective view of the impact dot head to which the heat radiator of FIG. 4 was attached. It is a perspective view which shows another example of a heat radiator. It is a perspective view which shows another example of a heat radiator. It is a perspective view which shows another example of a heat radiator. It is the top view and sectional drawing which show the blank used for the press forging of the heat radiator of FIG. It is the longitudinal cross-sectional view and side view which show the state which inserted the core in the blank of FIG. It is a schematic block diagram of the forge press used for manufacture of the heat radiator of FIG. It is explanatory drawing which shows the forge state by the forge press of FIG. It is explanatory drawing which shows the mechanism used for forming the shaft hole of the heat radiator of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Impact dot head, 2 Head part, 3, 3A-3D Radiator, 30 Radiator body, 31 Cylindrical body part, 32 End plate part, 33 Radiation fin, 33a Groove, 34 Projection for heat collection, 36, 37 Radiation Protrusion, 36a, 37a Shaft hole, 38 Heat dissipation protrusion, 41, 42 Heat dissipation pin, 50 Blank, 51a Thick part, 60 Core, 70 Press device

Claims (8)

A radiator body including a cylindrical body and an end plate portion sealing one end of the cylindrical body,
A heat dissipating protrusion and / or a heat dissipating concavo-convex part formed on the outer peripheral surface of the cylindrical body and / or the outer surface of the end plate portion;
The radiator of the impact dot head, wherein the radiator main body, the radiating protrusion and / or the radiating uneven portion are integrally formed by forging a blank made of aluminum. In claim 1,
A plurality of the heat dissipation protrusions protruding in the same direction from the outer peripheral surface of the cylindrical body,
These heat dissipation projections are arranged at predetermined intervals in the moving direction of the impact dot head,
Each heat dissipating protrusion has a groove or cutout at the same position when viewed along the direction of movement of the impact dot head. In claim 1 or 2,
The heat dissipation protrusion protrudes from the outer peripheral surface of the cylindrical body,
A heatsink of an impact dot head in which a shaft hole for passing a carriage guide shaft for guiding the movement of the impact dot head is formed in the heat dissipation projection. In claim 1, 2 or 3,
It has a heat collecting protrusion protruding from the inner surface of the end plate part or the inner peripheral surface of the cylindrical body part,
A heat radiator for an impact dot head, wherein the heat-collecting protrusions are also integrally formed when the blank is forged.   An impact dot head comprising the radiator according to any one of claims 1 to 4.   A printer comprising the impact dot head according to claim 5. An impact dot head having a radiator body including a cylindrical body and an end plate portion sealing one end of the cylindrical body, and a heat dissipation protrusion formed on the outer peripheral surface of the cylindrical body. A method of manufacturing a radiator,
Provided with a blank made of aluminum provided with a part corresponding to the cylindrical body part and the end plate part, the part of the cylindrical body part where the projection for heat dissipation is formed is thick,
Insert a deformation prevention core inside the blank,
The blank in this state is forged from both sides of the cylindrical body using a split die,
A method of manufacturing a radiator for an impact dot head, in which a part of a blank material is extruded into a meat relief corresponding to the heat dissipation protrusion formed on one of the split molds and the heat dissipation protrusion is integrally formed. In claim 7,
Forming a pair of heat dissipation protrusions extending in the same direction;
A method of manufacturing a radiator for an impact dot head, in which a shaft hole for passing a carriage guide shaft is formed in these heat dissipation protrusions by punching.

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