JPH08156499A - Motor-driven engraving machine - Google Patents

Abstract

PURPOSE: To stabilize rotation of a cam member and to prevent mechanical loss and to transmit smooth rotation by reciprocating an output shaft at a prescribed stroke by the cam face of the cam member rotated by a motor and press-inserting the cam member into a ball bearing. CONSTITUTION: A motor-driven engraving machine has a cam member 11 rotated by a rotary driving gear 2 held in a housing 1. An output shaft 17 having an abutment 19 abutting against the cam face 11c of the cam member 11 is provided in the position eccentric for the axis 2a of rotation of the rotary driving gear 2. The output shaft 17 fitting an engraving edge 24 to the tip part is reciprocated at a prescribed stroke by the cam face 11c. In this case, the cam member 11 is press-inserted into the outer circumferential part of a cam shaft 10 which is provided to the axis 2a of rotation and provided with a fan 15 for cooling in the outer circumference. Rotation of the cam member 11 is stabilized by press-inserting the cam member 11 into a ball bearing 12 held in the housing 1 and freely rotatably supporting it.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electric engraving machine.

[0002]

2. Description of the Related Art Generally, an electric engraving machine for engraving is known in which an engraving blade is electrically reciprocated.

FIG. 8 is an enlarged view of a main part of a conventional electric engraving machine. Reference numeral 101 in the drawing denotes a motor, and this motor 101
A cam shaft 102 is attached to the motor shaft 101a of the. Further, the camshaft 102 has a washer 104.
The cam 105 and the cam 105 are integrally formed. Cam 1
A cam surface 105a is formed on 05. Further, the cam shaft 102 is loosely fitted in the ball bearing 103, and the ball bearing 103 is configured to receive only the load of the washer 104 in the axial direction. On the other hand, this cam surface 10
An output shaft 107 containing a steel ball 106 is provided at a position facing 5a so as to be movable in the axial direction.
An engraving blade (not shown) is attached to the output shaft 107.

When this electric engraving machine is used, the motor 101 is driven to rotate the cam shaft 102 and the cam 105. At the same time, the steel shaft 106 is brought into contact with the cam surface 105a of the cam 105 by moving the output shaft 107 to the left in the figure.
Then, the output shaft 107 reciprocates in the left-right direction in the drawing according to the stroke of the cam surface 105a of the cam 105, and by the reciprocating motion of the engraving blade (not shown) attached to the tip of the output shaft 107. Is performed.

[0005]

However, with the above-mentioned structure, it is difficult to integrally form the axial direction of the camshaft and the plane of the washer at a right angle, and if it is not a right angle, During engraving work by the reciprocating motion of the output shaft,
The axial direction of the ball bearing and the axial direction of the cam shaft are not parallel, mechanical loss occurs, heat is generated, and durability deteriorates.
Further, since the cam can move forward (to the right in FIG. 8), the steel may hit the steel ball unexpectedly, and an abnormal sound is generated. Further, since the camshaft is in a state where it can move in the axial direction, a fan for cooling the motor cannot be attached to the camshaft, and the fan for cooling the motor is designed behind the motor (on the left side in FIG. 8). However, there is a problem in that a space for mounting the fan is required, which eventually increases the size of the entire device.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electric engraving machine which is excellent in durability and can be downsized.

[0007]

According to the present invention, a housing (1), a rotary drive device (2) housed in the housing (1), and a cam rotated by the rotary drive device (2). Member (11) and the rotation drive device (2)
An output shaft (17) having a contact portion (19) at a position which is arbitrarily eccentric with respect to the rotating shaft (2a) and which contacts the cam surface (11c) of the cam member (11); In an electric engraving machine having an engraving blade (24) attached to a shaft (17), a camshaft (10) is provided on the rotating shaft (2a), and an outer peripheral portion of the camshaft (10) is provided. The cam member (11) is press-fitted, and the cam member (11) is press-fitted into the ball bearing (12) held in the housing (1); the cam shaft (10).
Around the outer periphery of the fan (1) for cooling the rotary drive (2)
5) is provided; the camshaft (10) is characterized by being molded of resin having an insulating function.

[0008]

When performing the engraving work, the rotation drive device is rotated to rotate the cam shaft and the cam member. In this state, the contact portion of the output shaft, which is on the shaft that is arbitrarily eccentric with respect to the rotation shaft, is brought into contact with the cam surface of the cam member. Then, the output shaft reciprocates with a predetermined stroke by the cam surface. Then, the engraving work can be performed by appropriately applying the engraving blade attached to the output shaft to the workpiece. At this time, since the cam is press-fitted into the ball bearing, the rotation of the cam is stable, there is no mechanical loss, and smooth rotation can be transmitted.

[0009]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front sectional view of an electric engraving machine according to the present invention. In the figure, reference numeral 1 is a housing member that constitutes a housing, and the motor 2 is housed inside the housing member 1. A switch 3 is provided on the left side of the motor 2 in FIG. 1, and a switch lever 4 for operating the switch 3 is provided. Further, a cord 5 is attached to the left end side of the housing member 1 in FIG. Further, on the right side of the motor 2 in FIG. 1, an operating portion 6 for performing engraving work is arranged.

FIG. 2 is an enlarged sectional view of this operating portion. Here, the motor 2 is integrally fixed to the fixing plate 7 and the spacer plate 8 by screws 9, and the housing member 1
It is positioned and provided. Further, the motor shaft 2a of the motor 2 is inserted into the cam shaft 10 formed of resin which is an insulating material, and is formed in the flat portion 2b formed on the motor shaft 2a and the insertion hole 10a of the cam shaft 10. The rotation of the motor shaft 2a is configured to be transmitted to the camshaft 10 by combining with the flat portion 10b. FIG. 2 of this camshaft 10
The middle right part is press-fitted into the recess 11a of the cam member 11. Here, four projections 10c, 10c, 10c, 10c are formed on the outer periphery of the camshaft 10 as shown in FIG. Further, as shown in FIG. 4, grooves 11b, 11b, 11b, 11b with which the protrusion 10c of the cam shaft 10 can be engaged are formed at appropriate positions of the cam member 11. Further, in FIG. 5, the cam member 11 is the inner ring portion 1 of the ball bearing 12 held by the housing member 1 (see FIG. 2).
It is pressed into 2a. Here, the cam member 11 is made of metal, and even if it is pressed into the ball bearing 12,
Durable against axial and rotational loads and resistant to wear. Further, a C ring 14 is provided on the left side of the ball bearing 12 in FIG. 5 with a spacer 13 interposed therebetween to prevent the camshaft 10 and the ball bearing 12 from coming off. Further, on the outer circumference of the camshaft 10,
A cooling fan 15 for cooling the motor 2 (see FIG. 2) is press-fitted on the left side of the ring 14 in FIG. In addition, in FIG. 2, an output shaft 17 is provided on the right side of the housing member 1 in FIG. There is. Further, a recess 17a is formed in the left end portion of the output shaft 17 in FIG. 2 and a steel ball 19 is housed therein. In addition, in FIG.
And a washer 21 is interposed on the left side of the pin 20 in the figure. A spring 22 is interposed between the washer 21 and the bearing 16 held by the housing member 1, and the output shaft 17 is always biased rightward in FIG. 2 via the washer 21 and the pin 20. . Also, output shaft 1
A fixing nut 23 is screwed to the right end of FIG. 2 in FIG. 2 and is configured to fix the engraving blade 24. On the other hand, a cam surface 11c is formed on the surface of the cam member 11 facing the steel ball 19.

The operation of the electric engraving machine thus configured will be described. First, in FIG. 1, the switch 3 is turned on by moving the switch lever 4, and the motor 2 is energized and operated. In FIG. 2, the motor shaft 2a is rotated by the operation of the motor 2, and the motor shaft 2a is rotated.
Is transmitted to the camshaft 10 via the flat portion 2b of the motor shaft 2a and the flat portion 10b of the camshaft 10, and the camshaft 10 rotates. This rotation of the camshaft 10 is caused by the protrusion 10c and the groove 11 of the cam member 11.
The cam member 11 is rotated by being transmitted by the engagement with b and the pressure input of the cam shaft 10 and the cam member 11. At this time, since the cam member 11 is press-fitted into the inner ring portion 12a of the ball bearing 12, the inner ring portion 12a also rotates integrally. Therefore, the cam member 11 can ensure stable rotation. Since the rotation of the cam member 11 is stabilized in this way, the rotation of the cam shaft 10 can also be stabilized, so that the cooling fan 15 can be attached to the cam shaft 10, and the rotation of the cam shaft 10 can cool the cooling fan. The motor 2 can be cooled by 15.

On the other hand, the worker applies the engraving blade 24 to the work material (not shown) in this state. At this time, the output shaft 17 is moved to the left in FIG. 2 against the urging force of the spring 22, and the steel ball 19 is brought into contact with the cam surface 11c of the cam member 11. Then, the output shaft 17 reciprocates in the left-right direction in FIG. 2 along the cam surface 11c. Thereby, a work material (not shown) can be engraved.

In this case, since the cam member 11 is press-fitted into the inner ring portion 12a of the ball bearing 12, it does not move in the axial direction, and moreover, from the steel ball 19 that hits in an eccentric state with respect to the rotating shaft. The cam member 11 can ensure stable rotation even when receiving the force of.

FIG. 6 is a diagram showing another embodiment of the present invention. The same members as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In this embodiment, the above-mentioned embodiment is C
While the spacer 13 is interposed when the ring 14 is attached, the flange portion 10d corresponding to the spacer 13 is integrally formed with the camshaft 10.
Accordingly, it is not necessary to use the spacer 13, the number of parts can be reduced, and the assembling can be easily performed.

FIG. 7 is a diagram showing another embodiment of the present invention. The same members as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In this embodiment, the motor shaft 2a of the motor 2 is inserted into the cam shaft 10, and the cooling fan 10e is integrally formed on the outer peripheral portion of the cam shaft 10. Further, four protrusions 10f are formed on the right side of the cooling fan 10e in the figure. Further, the cam member 11 is press-fitted into the inner ring portion 12a of the ball bearing 12 provided on the housing member. Moreover, the C ring 14 prevents the cam member 11 from coming off. Four groove portions 11d are formed on the left end side of the cam member 11 in FIG. Then, the camshaft 10 is inserted into the cam member 11, and the four protrusions 10f of the camshaft 10 are respectively engaged with the four groove portions 11d of the cam member 11, whereby the rotation of the camshaft 10 is changed. 11 is reliably transmitted. In addition, the camshaft 10 is a cam member 11
On the other hand, you may make it press-fit. Further, although the case where the cooling fan 10e is integrally formed with the camshaft 10 has been described in the present embodiment, the cooling fan 10e may be separately formed, and the camshaft 10 may be press-fitted into the cooling fan. In this case, the protrusion may be selectively formed integrally with the cam shaft or the cooling fan.

The camshaft 1 used in each of the above embodiments
Since 0 is formed of resin which is an insulating material, it is possible to form a double insulating structure together with the insulating function originally possessed by the motor 2.

In each of the above-mentioned embodiments, the spacer 13 and the C ring 14 can be eliminated by ensuring the press-fitted state of the cam shaft 10 and the cam member 11.

[0018]

According to the present invention, by press-fitting the cam member into the ball bearing as described above, the rotation of the cam member is stabilized, mechanical loss can be prevented, and durability can be improved. . Moreover, since the cam member is press-fitted into the ball bearing, movement in the axial direction is restricted, the cam member does not hit the steel ball, and an abnormal person can be prevented from occurring. Further, since the rotation of the cam member, and eventually the cam shaft, becomes stable, a cooling fan can be press-fitted into the cam shaft, and the overall size of the device can be reduced. Further, by molding the camshaft with a resin having an insulating function, a double insulating structure can be provided in addition to the insulating function originally possessed by the rotary drive device, and more reliable insulation can be achieved. .

[Brief description of drawings]

FIG. 1 is a front sectional view of an electric engraving machine according to the present invention.

FIG. 2 is an enlarged sectional view of an operating portion of the electric engraving machine according to the present invention.

FIG. 3 is a front view of a camshaft used in the electric engraving machine according to the present invention.

FIG. 4 is a front view of a cam member used in the electric engraving machine according to the present invention.

FIG. 5 is an enlarged sectional view of an operating portion of the electric engraving machine according to the present invention.

FIG. 6 is an enlarged view of a main part of an electric engraving machine according to another embodiment of the present invention.

FIG. 7 is an enlarged view of a main part of an electric engraving machine according to another embodiment of the present invention.

FIG. 8 is an enlarged view of a main part of a conventional electric engraving machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing member (housing) 2 ... Motor (rotary drive device) 2a ... Motor shaft (rotating shaft) 10 ... Cam shaft 11 ... Cam member 11c ... Cam surface 12 ... Ball bearing 15 ... Cooling fan (fan) 17 ... Output shaft 19 ... Steel ball (contact part) 24 ... Engraving blade

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[Procedure amendment]

[Submission date] October 30, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a housing, a rotary drive device housed inside the housing, and a cam mechanism portion provided on a rotary shaft of the rotary drive device.
And a position that is arbitrarily eccentric with respect to the rotation axis,
An output shaft having a abutment portion abutting on the cam surface of the cam mechanism, and have contact to the electric engraving machine equipped with a sculpture blade attached to the output shaft, the cam mechanism is held in the upper Symbol housing It is press-fitted into the ball bearing; a fan for cooling the rotary drive is provided on the outer periphery of the cam mechanism ; the cam mechanism is composed of a cam shaft and a cam member.
The camshaft is formed of resin having an insulating function.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

[0018]

According to the present invention, by press-fitting the cam mechanism into the ball bearing as described above, the rotation of the cam member can be stabilized, mechanical loss can be prevented, and durability can be improved. it can. Moreover, since the cam mechanism is press-fitted into the ball bearing, movement in the axial direction is restricted, the cam mechanism does not hit the steel ball, and abnormal noise can be prevented. . In addition, since the rotation of the cam mechanism is stable, a cooling fan can be press-fitted into the cam mechanism , and the overall size of the device can be reduced. In addition, the camshaft, which is a component of the cam mechanism ,
By molding the shaft with resin having an insulating function,
In addition to the insulating function originally possessed by the rotary drive device, a double insulating structure can be provided, and more reliable insulation can be achieved.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of reference numerals] 1 ... Housing member (housing) 2 ... Motor (rotary driving device) 2a ... Motor shaft (rotating shaft) 10 ... Cam shaft (cam mechanism portion) 11 ... Cam member (cam mechanism portion) 11c ... Cam surface 12 ... Ball bearing 15 ... Cooling fan (fan) 17 ... Output shaft 19 ... Steel ball (contact part) 24 ... Engraving blade

Claims (3)

[Claims] 1. A housing, a rotary drive unit housed in the housing, a cam member rotated by the rotary drive unit, and a position which is arbitrarily eccentric with respect to a rotary shaft of the rotary drive unit. In an electric engraving machine having an output shaft having an abutting portion that abuts the cam surface of the cam member, and an engraving blade attached to the output shaft, a cam shaft is provided on the rotary shaft. An electric engraving machine characterized in that the cam member is press-fitted onto an outer peripheral portion of a cam shaft, and the cam member is press-fitted into a ball bearing held in the housing. 2. The electric engraving machine according to claim 1, wherein a fan for cooling the rotary drive device is provided on the outer periphery of the camshaft. 3. The electric engraving machine according to claim 1, wherein the camshaft is made of a resin having an insulating function.