JP2007038610A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make sure of a stable insulating property for the radiating-fin shape of a hammer mechanism section of a printer for performing a dot printing with two or more printing hammers which are arranged in the direction of digit by the way of devising the radiating-fin shape of a hammer coil and then certainly forming an insulating layer with an adhesive of a predetermined thickness between the hammer coil winding and the radiating fin. <P>SOLUTION: The insulating layer with the adhesive of uniform thickness is made to be formed certainly between the hammer coil winding and the radiating fin by providing the radiating fin attached to the hammer coil which generates heat by hammer driving with a projection which can be positioned by colliding with the collar part of a hammer coil bobbin. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a printing apparatus that performs dot printing with a plurality of printing hammers arranged side by side in the digit direction, and more particularly to a printing apparatus having a radiation fin provided adjacent to a heat generating portion of a hammer mechanism that performs printing driving. It is.

  A dot line printer is a typical printing device that performs dot printing. A dot line printer is a printer that performs printing by reciprocating a hammer mechanism section, which is mounted with a printing hammer for performing dot printing, in a digit direction by a shuttle mechanism section. The printing hammer has a configuration in which a hammer pin is attached to the tip of the leaf spring, and the printing hammer is driven by releasing the bending energy previously given to the leaf spring, and the printing paper is passed through an ink ribbon impregnated with ink. This is a printer that performs dot printing.

  The configuration of the hammer mechanism in the conventional dot line printer will be described below. As shown in FIG. 2, the hammer spring 2 having the hammer pin 1 joined to the tip thereof is attached to the yoke base 5 together with the front yoke 6 on the magnetic circuit formed by the comb yoke 3, the magnet 4, the yoke base 5, and the front yoke 6. It is attached with bolts 7.

  Usually, the tip of the hammer spring 2 is in a state of being magnetically attracted to the comb yoke 3 by the magnet 4 with a predetermined amount of deflection, but by applying a pulse current in a direction to cancel the magnetic attraction force to the hammer coil 8, the hammer spring 2 is released, the hammer pin 1 is released from the comb yoke 3 (moved to the left in the figure), and hits the printing paper 16 via the ink ribbon 15 to perform dot printing. The platen 17 is a member that cushions the hammering force of the hammer pin 1.

  The hammer coil 8 generates heat as the hammer is driven, but this heat is radiated by the cooling air 10 to the radiation fins 9. Usually, the heat dissipating fins 9 are configured to be bonded and fixed onto the windings of the hammer coil 8.

  Here, in order to ensure insulation between the winding of the hammer coil and the heat radiating fin, the winding of the hammer coil and the heat radiating fin need to be fixed while forming an insulating layer of an adhesive having a predetermined thickness. For this reason, it is necessary to perform an assembling operation using a positioning jig that makes the relative position of the heat dissipating fins unique to the winding of the hammer coil or the bobbin, which complicates the assembling operation.

  Alternatively, in order to further ensure the insulation between the winding of the hammer coil and the radiating fin, there is an example in which an insulating member is fitted and fixed between the winding of the hammer coil and the radiating fin. There has been a problem that the manufacturing cost increases due to the complication of the process, or the part cost increases due to the addition of members.

  In addition, in terms of ensuring reliable insulation, there is an example in which an insulating filler having thermal conductivity is provided between the winding of the hammer coil and the radiation fin (see, for example, Patent Document 1). Assembly work using a jig for filling the agent with a predetermined thickness is required. Even when a thermally conductive insulating filler is used, it is advantageous for the heat dissipation efficiency that the insulating filler is thin. However, the thinner the insulating filler is, the more the assembly work can be performed. There is a concern that the manufacturing cost will increase due to increased difficulty and complicated assembly work.

Japanese Patent Laid-Open No. 11-020211

  As described above, in order to ensure the insulation between the winding of the hammer coil and the radiation fin, a positioning jig is used when the radiation fin is bonded and fixed, or an insulating member is provided between the winding of the hammer coil and the radiation fin. It was dealt with by combining. In that case, there has been a problem that the manufacturing cost increases due to the complexity of the assembly work, or the component cost increases due to the addition of members.

  Therefore, the object of the present invention is to devise the shape of the heat sink fins of the hammer coil, thereby reliably forming an insulating layer of adhesive with a uniform thickness between the windings of the hammer coil and the heat sink fins to ensure stable insulation. Is to realize.

  In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention is characterized in that a plurality of printing hammers, which are formed by hammer springs having a hammer pin at the tip thereof, are arranged at a predetermined pitch, and the printing hammers are arranged at non-printing positions. A magnet that generates a magnetic attraction force for holding the magnet, a hammer coil that is provided corresponding to each print hammer for driving the print hammer, and cancels the magnetic field of the magnet by supplying a pulse current of a predetermined width; and In a printing apparatus having a hammer mechanism having a radiation fin for radiating heat generated from a hammer coil, a shuttle mechanism for reciprocating the hammer mechanism in the digit direction, and a paper feed mechanism for feeding printing paper A convex protrusion is provided on the heat dissipating fin to contact a part of the hammer coil so that the winding of the hammer coil and the heat dissipating fin are provided. Forming a predetermined gap between the emissions, characterized by forming the insulating adhesive layer in the gap.

  According to a second aspect of the present invention for solving the above-mentioned problem, in the first aspect of the present invention, a front yoke for reinforcing the magnetic force of the magnet is provided on the hammer pin mounting side of the printing hammer, and the front yoke is provided on the front yoke. A groove is provided at a position facing the convex protrusion of the heat radiating fin.

  The invention according to claim 3 of the present invention for solving the above-mentioned problems is characterized in that, in the invention according to claim 1, the radiating fin is formed by integral molding of light metal.

  The invention according to claim 4 of the present invention for solving the above-mentioned problems is characterized in that, in the invention according to claim 1, the heat dissipating fins are formed by sheet metal pressing of a light metal plate.

  The heat dissipating fin of the present invention can stably form an insulating layer with an adhesive having a predetermined thickness with the winding of the hammer coil, and by securing insulation, the work of assembling the hammer coil without requiring additional members Product cost can be expected to be reduced.

  For the radiating fin provided on the hammer coil that generates heat when the hammer is driven, by providing a convex protrusion that can be positioned by abutting against the flange of the bobbin of the hammer coil, it is ensured between the winding of the hammer coil and the radiating fin. In addition, an insulating layer made of an adhesive having a uniform thickness can be formed.

  Hereinafter, the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of the main part showing the configuration of a hammer mechanism in a dot line printer as an example of the present invention. A hammer spring 2 having a hammer pin 1 joined to the tip thereof is attached to the yoke base 5 together with the front yoke 6 with bolts 7 on a magnetic circuit formed by the comb yoke 3, the magnet 4, the yoke base 5, and the front yoke 6. . The tip of the hammer spring 2 is in a state of being magnetically attracted to the comb yoke 3 by the magnet 4 with a predetermined deflection amount. By passing a pulse current in a direction that cancels the magnetic attraction force to the hammer coil 8, The configuration is such that the flexure is released and the hammer pin 1 is released from the comb yoke 3. The hammer coil 8 has a winding 13 wound around a bobbin 18. And the radiation fin 9 is fixed on the winding 13 of the hammer coil 8 via an insulating adhesive.

  In the present invention, the protruding fins 11 are provided on the radiating fins 9. The protrusion 11 is disposed at a position facing the bobbin collar 12 so that the hammer coil 8 can be abutted against the bobbin collar 12. According to such a configuration, it is possible to reliably form an insulating layer of an adhesive having a uniform thickness between the winding 13 of the hammer coil 8 and the radiation fin 9. Here, it is natural that the height of the winding 13 of the hammer coil 8 does not exceed the height of the bobbin collar 12.

  Further, the front yoke 6 which is mounted facing the heat radiating fins 9 and is a part of the magnetic circuit constituent member is prevented in advance from interfering with the tips of the convex protrusions 11 provided on the heat radiating fins 9. A relief hole 14 is provided in a portion facing the convex protrusion 11. This escape hole 14 is configured to provide a square hole on the front yoke 6 side so as to escape only in a portion facing the convex protrusion 11.

  In the present invention, the protrusion 11 is provided for each hammer coil 8. However, the protrusion 11 is provided on the radiating fin 9 over the entire beam direction, and the front yoke 6 side also has the beam direction. The effect of the present invention can be obtained even if the groove is provided throughout.

  The heat dissipating fins 9 can be formed by integral molding by aluminum die casting or the like, and can be formed without increasing the number of parts. Further, as shown in FIG. 3, an integrated processing by sheet metal pressing is also possible. In this case, the convex protrusion 11 is formed by, for example, cutting and bending, and can be manufactured at low cost by progressive pressing.

  According to the configuration as described above, an insulating layer with an adhesive having a uniform thickness can be stably formed between the heat-radiating fins fixed to the windings of the hammer coil via an adhesive, and insulated. As a result, it is possible to improve the workability of the hammer coil assembly work without the need for additional members, so the product cost can be reduced.

  For the radiating fin provided on the hammer coil that generates heat when the hammer is driven, by providing a convex protrusion that can be positioned by abutting against the flange of the bobbin of the hammer coil, it is ensured between the winding of the hammer coil and the radiating fin. By forming an insulating layer with an adhesive with a uniform thickness, it is possible to ensure stable insulation, eliminating the need for additional members and eliminating the need for positioning jigs in assembly operations As a result, it is possible to reduce the product cost.

Sectional drawing which shows the hammer mechanism part used as an example of this invention. Sectional drawing which shows the conventional hammer mechanism part. Sectional drawing which shows the hammer mechanism part used as the other example of this invention.

Explanation of symbols

1 is a hammer pin, 2 is a hammer spring, 3 is a comb yoke, 4 is a magnet, 5 is a yoke base, 6 is a front yoke, 7 is a bolt, 8 is a hammer coil, 9 is a radiating fin, 10 is cooling air, and 11 is a convex shape Protrusions, 12 is a bobbin collar, 13 is a winding of a hammer coil, 14 is a relief hole, 15 is an ink ribbon, 16 is paper, 17 is a platen, and 18 is a bobbin.

Claims (4)

Driven by a plurality of printing hammers arranged at a predetermined pitch, a magnet that generates a magnetic attractive force to hold the printing hammer in a non-printing position, and a hammer spring having a hammer spring with a hammer pin at the tip. A hammer mechanism provided with a hammer coil for canceling the magnetic field of the magnet by supplying a pulse current having a predetermined width, and a heat dissipating fin for radiating heat generated from the hammer coil; In a printing apparatus having a shuttle mechanism for reciprocating the hammer mechanism in the digit direction and a paper feed mechanism for feeding print paper,
Protruding protrusions are provided on the heat dissipating fins to contact a part of the hammer coil to form a predetermined gap between the winding of the hammer coil and the heat dissipating fin, and an insulating adhesive layer is formed in the gap. A printing apparatus characterized in that is formed.   A front yoke that reinforces the magnetic force of the magnet is provided on a hammer pin mounting side of the printing hammer, and a groove is provided in the front yoke at a position facing the convex protrusion of the radiating fin. The printing apparatus according to 1.   The printing apparatus according to claim 1, wherein the heat dissipating fins are formed by integral molding of light metal. The printing apparatus according to claim 1, wherein the radiating fin is configured by sheet metal pressing of a light metal plate.

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