JPS628978Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an inexpensive relieving device for a gear shaping machine that is easy to adjust and maintain, and has excellent durability.

A relieving device is used in a gear shaping machine to release a cutter head backward in order to avoid interference with a workpiece during the return process of a pinion cutter, and various types of relieving devices have been known.

For example, as shown in FIG. 1 showing a schematic cross-sectional structure of a part of the column and FIG. 2 showing a schematic structure of a main part thereof, a main shaft 102 driven by a drive source (not shown) is attached to the upper end of the column 101. A connecting shaft 103 that is freely attached and rotatably supported by a column 101 at right angles to the main shaft 102 is integrally provided with a bevel gear 105 that meshes with a bevel gear 104 fixed to the main shaft 102. . The camshaft 107 on which the eccentric cam 106 is formed is connected to the joint 10
It is coaxially connected to the connecting shaft 103 via the column 8, and is rotatably housed within the column 101. A swinging arm 110 equipped with a cam follower 109 that engages with the eccentric cam 106 is integrally protruded from a swinging shaft 111 that is rotatably attached to the column 101 parallel to the camshaft 107. Moving axis 1
Elastic connection member 112 fitted eccentrically to 11
A cutter head 113 is connected to the cutter head 113 via a bolt 114. In addition, this cut head 113
A cutter spindle 116 with a pinion cutter 115 attached to the tip is attached to the spindle cutter 116 so as to be rotatable and slidable in a direction parallel to its longitudinal direction (vertical direction in FIG. 1). A connecting rod 117 fitted eccentrically to the main shaft 102 is connected via a spherical joint (not shown).

The bevel gears 104 and 105 are set to have the same number of teeth, so the camshaft 107 rotates synchronously with the main shaft 102 via the connection shaft 103, and the swing arm 110
The swing shaft 111 is reciprocated within a certain range by the rotation of the eccentric cam 106 via the cam follower 109. As a result, the elastic connecting member 112, which is eccentrically attached to the swing shaft 111, is slightly displaced in the front-rear direction (left-right direction in the figure), but since this displacement and the rotation of the main shaft 102 are synchronized, When the cutter spindle 116 returns, the entire cutter head 113 is drawn toward the column 101 around the aforementioned spherical joint, thereby preventing interference with a workpiece (not shown).

However, in such a conventional relieving device, the entire cutter head 113 swings around the spherical joint, and a slight displacement is applied to the cutter head 113 in a direction parallel to the longitudinal direction of the cutter head 116. Swing axis 111
As a connecting member between the cutter head 116 and the cutter head 116, an elastic connecting member 112 such as the above-mentioned leaf spring or the like that can be released is required. That is, since complicated bending stress is repeatedly applied to the elastic connecting member 112, it is difficult to manufacture the elastic connecting member 112 in terms of durability and performance and tends to be expensive. or,
Since the connecting shaft 103, cam shaft 107, and swing shaft 111 are built into the column 101, assembly work, adjustment, and maintenance are troublesome.
A cam box 118 and a joint 10 are installed in the column 101.
8 must be provided, and bevel gears 104, 105
This, coupled with the fact that it uses a large number of parts, has the drawback of high costs. Further, since the connecting shaft 103 becomes considerably long in correspondence with the distance from the main shaft 102 to the pinion cutter 115, there are many problems in terms of rigidity.

The purpose of the present invention is to provide a high-rigidity, inexpensive relieving device that is easy to adjust, maintain, and assemble, is easy to adjust, maintain, and assemble, and is highly durable. shall be.

The structure of the gear shaping machine relieving device of the present invention that achieves this purpose is that the main shaft is rotatably supported by a gear box provided at the upper end of the column, and the main shaft is eccentrically connected to the main shaft. A cutting head that supports the cutting spindle rotatably and slidably in a direction parallel to its longitudinal direction. A gear shaping machine comprising: a camshaft rotatably attached to the gear box parallel to the main shaft and having a gear that meshes with a gear provided on the main shaft and on which an eccentric cam is formed; a swing shaft that is rotatably attached to the box parallel to the main shaft and is integrally provided with a swing arm that engages with the eccentric cam; one end side is eccentrically connected to the swing shaft, and the other end is connected to the swing shaft in an eccentric state; and a relieving link whose side is pivotally connected to the cutter head.

Therefore, according to the present invention, since most of the parts are assembled in the gear box provided at the upper end of the column, assembly, adjustment, and maintenance can be performed easily and quickly. In addition, there is no need to use bevel gears or long connecting shafts, and the swing shaft and cutter head can be directly connected with a high-rigidity link instead of an elastic connecting member, making it inexpensive and durable. It is possible to make the

Hereinafter, an embodiment of the relieving device for a gear shape cutting machine according to the present invention will be described in detail with reference to FIGS. 3 to 5.

Fig. 3 showing the schematic structure of this embodiment and its -
As shown in FIG. 4, which shows a cross-sectional structure in the direction of arrows, a main shaft drive motor 13 equipped with a drive pulley 12 and a gear box 14 are provided at the upper end of the column 11.
A main shaft 16 having a transmission pulley 15 is connected to this gear box 1.
4, and an endless V-belt 17 is wound around the transmission pulley 15 and the drive pulley 12. The gear box 14 includes an intermediate shaft 20 having a spur gear 19 that meshes with a spur gear 18 fixed to the main shaft 16, and a spur gear 22 that meshes with another spur gear 21 fixed to the intermediate shaft 20. camshaft 23
As shown in FIG. 5, which shows a cross-section viewed from the − arrow in FIG.
A swing arm 26 having a cam follower 25 that engages with the main shaft 16 and a swing shaft 27 integrally protruding from each other are each rotatably attached in parallel with the main shaft 16. On the other hand, a cutting spindle 30 with a pinion cutter 29 attached to the tip is attached to the connecting rod 28 which is eccentrically fitted to the main shaft 16 so as to be rotatable.
are connected via a spherical joint (not shown),
This cutter spindle 30 is rotatably attached to the cutter head 31 by a drive source (not shown).
is capable of sliding freely on the cutter head 31 in a direction parallel to its longitudinal direction (vertical direction in FIG. 3). Eccentric portion 3 formed on the swing shaft 27
The other end of the relieving link 33, one end of which is rotatably fitted to the cutter head 31, is pivotally connected to the cutter head 31 via a pin 34, and as the relieving link 33 operates, the cutter head 31 is connected to the spherical joint. The relieving motion is performed to the left and right in FIG. 3, centering on . Note that the mutually meshing spur gears 18, 19, 21, and 22 are all set to have the same number of teeth, and one rotation of the main shaft 16 and the camshaft 23
It is designed to be synchronized with one revolution of . In this embodiment, the intermediate shaft 20 was assembled to the gear box 14, but
It is also possible to directly mesh the spur gear 22 of the camshaft 23 with the spur gear 18 of the main shaft 16 and omit the intermediate shaft 20, spur gear 19, etc.

Therefore, when the main shaft 16 is driven to rotate via the V-belt 17 due to the operation of the main shaft drive motor 13, the spherical joint is connected to the connecting rod 28 via the connecting rod 28.
In order to transmit only the vertical displacement component of , to the cutter spindle 30, the pinion cutter 29 starts reciprocating cutting motion in the vertical direction in FIG. 3 with respect to the cutter head 31 together with the cutter spindle 30. on the other hand,
The rotation of the main shaft 16 is controlled by a camshaft 23 via an intermediate shaft 20.
However, since the swing arm 26 reciprocates within a certain angle range together with the swing shaft 27 by the cam follower 25 that engages with the eccentric cam 24, The relieving link 33 is slightly reciprocated in a direction parallel to its longitudinal direction, and as a result, the cutter head 3
1 swings around the spherical joint. The swinging of the cutter head 31 and the vertical movement of the cutter spindle 30 are naturally synchronized, and during the return process of the pinion cutter 29, the cutter head 31 is displaced to the left in Fig. 3, automatically preventing interference with the workpiece. blocked.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the schematic structure of a conventional relieving device for a gear shaper, Fig. 2 is a conceptual diagram of its main parts, and Fig. 3 is a diagram of the relieving device for a gear shaper according to the present invention. FIG. 4 is a sectional view showing the schematic structure of one embodiment, FIG. 4 is a sectional view taken in the direction of the arrow, and FIG. 5 is a sectional view taken in the direction of the arrow. is the main axis, 1
8 and 22 are gears, 23 is a camshaft, 24 is an eccentric cam, 25 is a cam follower, 26 is a swing arm, 2
7 is a swing shaft, 28 is a connecting rod, 29 is a pinion cutter, 30 is a cutter spindle, 31 is a cutter head, 32 is an eccentric portion, 33 is a relieving link, and 34 is a pin.

Claims (1)

[Scope of utility model registration request] A main shaft is rotatably supported by a gear box provided at the upper end of the column, a connecting rod is connected eccentrically to the main shaft, and a pinion cutter is connected to the connecting rod via a spherical joint and has a pinion cutter at the tip. In a gear shaping machine equipped with a cutter spindle mounted thereon and a cutter head that supports the cutter spindle so as to be rotatable and slidable in a direction parallel to its longitudinal direction, the gear box is provided with a cutter head that is rotatable in parallel to the main shaft. a camshaft that is attached to the gear box and has a gear that meshes with a gear provided on the main shaft and is formed with an eccentric cam; and a rock that is rotatably attached to the gear box parallel to the main shaft and that engages with the eccentric cam. A reel for a gear shaping machine, comprising a swing shaft having an integrally provided moving arm, and a relieving link whose one end side is eccentrically connected to the swing shaft and whose other end side is pivotally connected to the cutter head. Bing equipment.