JPH08329B2 - Vertical milling machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vertical milling machine, and more particularly to a vertical milling machine with improved processing accuracy.

(Prior Art) A vertical milling machine is roughly configured as follows. First, there is a base, and a column is mounted on this base. A knee is attached to the front side of the column, a saddle is attached to the knee, and a table is attached to the saddle.

The knee is installed reciprocally in the vertical direction (Z direction) along the guide surface of the column, and the saddle is installed reciprocally in the horizontal direction (Y direction). Further, the table is installed so as to be orthogonal to the reciprocating direction of the saddle and capable of reciprocating in the same plane direction (X direction). The workpiece is held on the table.

A main shaft portion is arranged above the table.
A quill is attached to the main shaft portion, and a spindle is attached to the quill. A cutter is detachably attached to this spindle.

Then, the workpiece is machined by the cutter while appropriately moving these knee, saddle, table, and main shaft portion.

(Problems to be Solved by the Invention) According to the above configuration, there are the following problems in terms of processing accuracy.

In other words, the finishing process may be performed while automatically lowering the quill. At that time, when the top member attached to the quill moves to the desired position, the rotation of the quill is transmitted to the quill via the link mechanism. Is stopped, whereby the bottom feed machining is stopped.

However, there is some play from when the top member moves to the target position until the transmission of rotation to the quill stops and the descent of the quill actually stops, resulting in a decrease in machining accuracy. There was a problem.

The present invention has been made based on such a point, and an object of the present invention is to provide a vertical milling machine capable of improving processing accuracy.

(Means for Solving the Problems) In order to achieve the above object, a vertical milling machine according to the present invention has a base, a column mounted on the base, and on the base in front of the column. A saddle that is arranged and reciprocates in the vertical direction along the guide surface of the column; a table that is mounted on the saddle and that reciprocates in the horizontal direction orthogonal to the reciprocating direction of the saddle to hold the workpiece; A quill that reciprocates in the vertical direction, including a spindle attached to the upper end of the column, a spindle detachably holding a cutter attached to the spindle, a quill lifting means for raising and lowering the quill, and the quill. A rotation transmission means for transmitting rotation given from a dedicated motor or the spindle to the elevation means and a rotation transmission means provided with a clutch mechanism, and arranged so as to be able to ascend and descend on the front surface side of the main shaft portion. A lower feed stopper, a lifting member that is attached to the quill and moves up and down as the quill moves up and down, and a cam member that is attached to the main shaft portion and rotates the cam member in one direction from a neutral state. An operating handle for putting the clutch mechanism of the rotation transmitting means into a state capable of downward feeding, and a clutch mechanism of the rotation transmitting means by operating the operating handle to rotate the cam member in one direction from the neutral state. When the lower feed is carried out by transmitting the rotation to the quill raising and lowering means, the cam member is rotated in the other direction to return to the neutral state by the collision with the lower feed stopper of the top member, thereby transmitting the rotation. Means for disengaging the clutch mechanism of the means,
It is characterized by having.

At that time, it is considered that the quill lifting means is provided with a clutch mechanism and an elastic means, and the clutch mechanism is disengaged by elastically deforming the elastic means in an arbitrary direction.

Alternatively, an upper feed stopper is arranged so as to be able to move up and down on the front side of the main shaft portion and above the lower feed stopper, and the device handle rotates the cam member in one direction from the neutral state. The clutch mechanism of the rotation transmitting means is put into a state where it can be fed downward, and the cam member is rotated in the other direction from the neutral state so that the clutch mechanism of the rotation transmitting means is put into a state where it can be fed upward. The operating means operates the operating handle to rotate the cam member in the other direction from the neutral state, thereby inserting the clutch mechanism of the rotation transmitting means and transmitting the rotation to the quill lifting means. When performing top feed processing by rotating the cam member in one direction due to collision with the top feed stopper of the top member, Back to Le state, whereby it is conceivable to make off clutch mechanism of the rotation transmitting means.

(Operation) When performing the lower feed processing, the lower feed stopper is arranged at a desired position, and the operation handle is operated to rotate the cam member in one direction from the neutral state,
Insert the clutch mechanism of the rotation transmission means.

As a result, the rotation transmitted from the dedicated motor or the spindle side is applied to the quill via the rotation transmitting means and the quill raising / lowering means, and the quill descends, and accordingly the lower feed processing is performed by the cutter.

When the top member collides with the lower feed stopper, the lower feed processing stops there. In other words, the processing is stopped by "stop the collision". At the same time, due to the action of the action means, the cam member is rotated in the other direction to return to the neutral state, and the clutch mechanism of the rotation transmission means is disengaged. This stops the transmission of rotation to the quill.

When the quill lifting means is provided with the clutch mechanism and the elastic means, when the elastic means elastically deforms in an arbitrary direction,
The clutch mechanism of the quill lifting means is disengaged. Therefore,
Even if the rotation transmission to the quill does not stop, the overload is surely prevented.

When providing the upper feed stopper to perform the upper feed processing, first place the upper feed stopper at the desired position and operate the operation handle to rotate the cam member in the other direction from the neutral state. , Insert the clutch mechanism of the rotation transmission means.

As a result, the rotation transmitted from the dedicated motor or the spindle side is imparted to the quill via the rotation transmission means and the quill raising / lowering means, and the quill rises, and accordingly the upper feed processing is performed by the cutter.

When the top member collides with the upper feed stopper, the upper feed process stops there. In this case as well, it is a "collision stop". At the same time, by the action of the action means, the cam member is rotated in one direction to return to the neutral state, and the clutch mechanism of the rotation transmission means is disengaged. This stops the transmission of rotation to the quill.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 14.

FIG. 1 is a front view of a vertical milling machine according to this embodiment, and FIG. 2 is a side view of the same. First, there is a base 1, and the vertical milling machine is installed at any place via the base 1.

A column 3 is mounted on the base 1. A knee 5 is arranged on the base 1 and in front of the column 3. The knee 5 reciprocates in the vertical direction (Z direction, indicated by arrow a in the figure) along the guide surface of the column 3 and is operated by the operation handle 7.

A saddle 9 is mounted on the knee 5, and the saddle 9 reciprocates in the horizontal direction (direction orthogonal to the paper surface in FIG. 1, hereinafter referred to as Y direction, which is indicated by arrow b in FIG. 2).
It is the operation handle 11 that operates this.

A table 13 is arranged on the saddle 9.
The table 13 reciprocates in the horizontal direction (the horizontal direction in FIG. 1, hereinafter referred to as the X direction, which is indicated by an arrow c in FIG. 1) orthogonal to the Y direction, and is operated by
The operation handle 15. Then, a work (not shown) is placed and fixed on the table 13.

 Incidentally, reference numeral 16 in the figure is an operation box.

An over arm 17 is arranged at the upper end of the column 3, and the over arm 17 reciprocates in the Y direction.

A spindle portion 19 is attached to the front of the overarm 17, and a quill 21 is attached to the spindle portion 19. A spindle 25 is attached to the quill 21, and a cutter 23 is attached to the spindle 25. The quill 21 has a fine feed handle 27 or a fast feed handle 29.
It is moved up and down by operating. Further, it is the fine movement / rapid feed switching handle 31 that switches between fine movement and fast feed.

The above is the schematic configuration of the vertical milling machine according to the present embodiment. The configuration of each unit will be described in detail below.

The positional relationship between the quill 21 and the spindle 25, etc., which has already been described, is as shown in FIG. A pulley shaft 33 is arranged on the outer periphery of the upper end of the spindle 25, and a multistage pulley 35 is fixed to the pulley shaft 33.

On the other hand, another multi-stage pulley 37 is arranged at a distance from the multi-stage pulley 35, and is fixed to the rotary shaft 41 of the drive motor 39. A V-belt 43 is wound between the multi-stage pulleys 35 and 37, and the rotation of the drive motor 39 is transmitted to the multi-stage pulley 35 side via the V-belt 43.

A clutch mechanism 45 is arranged at the lower end of the pulley shaft 33, and rotation is transmitted to the spindle 25 side by turning the clutch mechanism 45 on and off.

A gear portion 47 is formed at the lower end of the pulley shaft 33, and a gear 49 is meshed with the gear portion 47. This gear 49 is fixed to the shaft 51.
Another gear 53 is fixed to the lower end of 51. On the other hand, another gear 55 is also fixed to the outer periphery of the spindle 25, and has a relationship of selectively meshing with the gear 53.

That is, the rotation of the pulley shaft 33 can be transmitted to the spindle 25 by meshing the gears 53 and 55. When the rotation is transmitted by the former, the rotation speed is high, and when the rotation is transmitted by the latter, the rotation speed is low.

By the way, while the spindle 25 rotates, the quill 21 does not rotate. That is, spindle 25 and quill 21
A plurality of bearings 57 are interposed between the quill 21 and, and the spindle 25 is rotatable with respect to the quill 21.

As described above, the quill 21 performs the raising / lowering operation, and the raising / lowering operation is enabled by the quill raising / lowering means including the rack 59 formed on the quill 21 and the pinion 61 meshing with the rack 59. 62. This quill lifting means 62
The configuration will be described later in detail.

Next, the configuration of the main shaft portion 19 on the front surface side will be described with reference to FIGS. 4 to 6. As shown in FIG. 4, the display unit 63 is provided on the left side of the above-described fine movement feed handle 27 in the figure.
Is arranged. A scale plate 65 is installed on the display portion 63, and scales 67 and 69 are displayed on the scale plate 65 in two columns in the vertical direction. Above scale 67
Is for upward feed, and the scale 69 is for downward feed.

In addition, indexes 71 and 73 are arranged at the upper and lower end positions on the lower surface side of the scale plate 65 so as to be able to move up and down. The index 71 is for upward feed, and the index 73 is for downward feed.

The indexes 71 and 73 are moved up and down by the following mechanism.
First, the index 73 is attached to the gear 75 as a stopper as shown in FIG. This gear 75
Is screwed onto a square screw shaft 77 extending vertically.

Another gear 79 meshes with the gear 75, and the gear 79 is slidably attached to a shaft 81 extending in the vertical direction. That is, the shaft 81 has a groove 83 formed in the axial direction, and the gear 79 has the groove 83.
It is attached by inserting pin 85 into.

A lower feed knob 87 is attached to the lower end of the shaft 81, and the gear 79 is rotated by pinching the lower feed knob 87 and rotating the shaft 81. This gear
The rotation of 79 also rotates the gear 75 as a stopper.
The gear 75 rotates and ascends and descends, whereby the index
73 also goes up and down.

On the other hand, since the gear 75 and the gear 79 are connected by the ring 89, the gear 79 also moves up and down as the gear 75 moves up and down.

Next is the index 71, which is a gear as a stopper.
The gear 95 is mounted on the square screw shaft 77. Another gear 97 meshes with the gear 95, and the gear 97 is attached to the shaft 99. That is, the gear 97 is attached by inserting the pin 103 into the groove 101 formed by extending the shaft 99 in the axial direction. Also, the upper feed knob 105 is provided at the lower end of the shaft 99.
Is installed.

By pinching and rotating the upper feed knob 105, the shaft 99 is rotated, and thereby the gear 97 is rotated. The rotation of this gear 97 causes the gear to function as a stopper.
95 moves up and down while rotating. By moving the gear 95 up and down, the index 71 also moves up and down.

Further, since the gear 95 and the gear 97 are connected via the ring 107, the gear 97 also moves up and down as the gear 95 moves up and down.

On the other hand, a top member 109 is attached to the quill 21 as shown in FIG. 3, and the top member 109 also moves up and down as the quill 21 moves up and down. The top member 109 is brought into contact with the gear 75 or 95 serving as the stopper, so that the lifting and lowering operation of the quill 21 is stopped.

By the way, another screw shaft 111 is extendedly arranged on the back side of the shaft 99 as shown in FIG.
The screw shaft 111 constitutes a part of the action means 112, and the gears 113, 11 are provided at the upper and lower positions of the screw shaft 111.
The gears 113 are meshed with the gear 95, and the gear 115 is meshed with the gear 75.

A block 117 is attached to the upper end of the shaft 111, and a groove 119 is formed in the block 117 in the horizontal direction.

On the other hand, as shown in FIG.
1 is extended, and the shaft 121 is rotatably supported by bearings 123 and 125 at both ends thereof. Also, the shaft 121
An annular member 127 is attached to one end of the annular member 127 (the left end in FIG. 7), and a pin 129 is provided at an eccentric position of the annular member 127. The pin 129 is engaged with the groove 119.
Therefore, the screw shaft 111 and thus the block 117 are
By moving up and down, the annular member 127 and thus the shaft 121 rotate via the pin 129.

 The function of the operating means 112 will be described later.

As for the quill lifting means 62, as already mentioned,
A rack 59 is formed on the quill 21.
A pinion 61 is meshed with this. The pinion 61 is
As shown in FIG. 8, it is fixed to the pinion shaft 131.

On the outer circumference of the pinion shaft 131, the wheel gear 1
33 is rotatably mounted. On the other hand, fine handle
As shown in FIG. 9, a worm gear 137 is fixed to the tip of the shaft 135 to which the 27 is fixed, and the worm gear 137 meshes with the wheel gear 133.

As shown in FIG. 8, another shaft 139 is connected to the pinion shaft 131. This shaft 1
The 39 has its rotation restricted by the key 141,
On the other hand, it is slidable in the axial direction. An annular member 143 is attached to the outer circumference of the shaft 139. The rotation of the annular member 143 is also restricted by a key 145, and it is slidable in the axial direction.

A spring 147 is stretched between the annular member 143 and the ring 146 attached to the shaft 139.

A clutch mechanism 14 that mainly functions as a torque limiter is provided between the annular member 143 and the wheel gear 133.
9 is installed, and by inserting this clutch mechanism 149, the wheel gear 133 side and the annular member 143 and thus the pinion shaft 131 side are connected. As a result, the rotation transmitted from the fine movement handle 27 side is applied to the pinion shaft 13
Transfer to 1 and move quill 21 up and down.

When an overload is applied in the connected state, the spring 147 is compressed and the clutch mechanism 149 is disengaged.

On the shaft 139, the fast-forward handle 29 already mentioned
Are connected. A clutch mechanism 151 is also installed between the rapid feed handle 29 and the shaft 139.

In addition, a cover 152 is attached to the mounting portion of the fast-forward handle 29.
Is attached, and a circle 156 is inserted between the cover 152 and the member 154. Due to the friction between the circle ring 156 and the cover 152, the cover 152 and thus the fast-forward handle 29 can be held at an arbitrary position.

It is the fine feed / fast-forward switching handle 31 that enters / disengages the clutch mechanism 149. That is, as shown in FIG. 8 and FIG.
A lever member 155 is connected to the lever. This lever member 155
Rotates about a fulcrum 157 in the direction indicated by arrow d in the figure, and is constantly urged counterclockwise in FIG. 8 by a pin 156 urged by a spring 154.

On the other hand, as shown in FIG. 10, a pin 159 is provided so as to project from the side of the fine feed / rapid feed switching handle 31, and by appropriately rotating the fine feed / rapid feed switching handle 31, the pin 159 is inserted. The lever member 155 can be rotated.

The lever member 15 is operated by operating the fine feed / fast-forward switching handle 31 to the fine feed side (left side in FIG. 8).
5 is brought into the state shown by the solid line in FIG. 8, whereby the shaft 139 is slid to engage the clutch mechanism 149.

If the clutch mechanism 149 is connected, the rotation from the fine movement handle 27 side is transmitted, and the quill 21 can be moved up and down.

On the contrary, when the fine feed / fast-forward switching handle 31 is switched to the fast-forward side, the lever member 155 is in the state shown by the chain double-dashed line in FIG.
The connection of 149 is released. After that, the fast-forwarding handle 29 may be operated to connect the clutch mechanism 151, and the fast-forwarding handle 29 may be further rotated.

Next, the configuration of the rotation transmission means 160 that functions in the case of automatic feeding will be described. In the case of this embodiment, the rotational force at the time of automatic feeding is taken out from the spindle 25 (note that a dedicated motor may be used). That is, as shown in FIG. 7, there is a worm gear 161 that transmits the rotation from the spindle 25 side, and a wheel gear 163 meshes with this worm gear 161 as shown in FIG.

The wheel gear 163 is fixed to the shaft 165. The shaft 165 is rotatably supported by bearings 164 and 168. A bevel gear 169 is attached to the shaft 165 via a one-way clutch 167. Another bevel gear 171 is meshed with the bevel gear 169, and another bevel gear 173 is meshed with the bevel gear 171. The bevel gear 173 is attached to the shaft 165 via a one-way latch 175, and is allowed to rotate in the opposite direction to the bevel gear 169.

With this configuration, even if the rotation direction of the rotation transmitted from the spindle 25 side is changed (for example, by changing the rotation direction of the drive motor 39), the bevel gears 169, 1
This is so that 73 always rotates in the same direction.

Bevel gears 169, 17 on the outer circumference of the shaft 165.
A gear 177 is rotatably mounted between the gears 3 and 3.
A ring 178 is integrally attached to the gear 177.

Clutch mechanisms 179 and 181 are arranged between the gear 177 and the bevel gears 169 and 173, respectively.
When the clutch mechanism 179 is connected, rotation in one direction is transmitted to the gear 177, and when the clutch mechanism 181 is connected, rotation opposite to that is transmitted.

As mentioned above, the direction of this transmitted rotation is
Even if the rotation direction on the spindle 25 side is changed, it does not change at all.

Another gear 183 arranged below meshes with the gear 177. The gear 183 is attached to the shaft 185 so as to be slidable in the axial direction. The end of the ring 179 is engaged with the gear 183. Therefore, by sliding the gear 183, the ring 179 and the gear 177 are slid to connect either of the clutch mechanisms 179, 181. be able to.

The shaft 185 has a gear 1 at three axial positions.
87, 189, 191 are installed. Meanwhile, the shaft
The shaft 135 described above, which is arranged below the 185, also has gears 193, 195, and 197 in three axial positions.
Is installed.

Then, an arbitrary gear (for example, gear 189) among the gears 187, 189, and 191 and an arbitrary gear (for example, gear 195) among the gears 193, 195, and 197 are meshed with each other.
As a result, rotation from the spindle 25 side is
It is transmitted to 135 and can raise and lower the quill 21.

By the way, it is the upper feed / lower feed switching handle 199 that slides the gear 183. This will be described with reference to FIG. The upper feed / lower feed switching handle 199 is
It is attached to the shaft 201, and an annular member 203 is formed at the tip of the shaft 201. This annular member 2
A pin 205 is provided at the eccentric position of 03.

The pin 205 is engaged with a recess (not shown) of the gear 183. Then, by rotating the upper feed / lower feed switching handle 199 in an appropriate direction, via the pin 205,
Slide the gear 183, and thereby the clutch mechanism 1
Connect either 79 or 181.

It should be noted that when the upper feed / lower feed switching handle 199 is at the intermediate position, the clutch mechanism 179, 181 is in a so-called "neutral" state in which neither is engaged.

A cam 207 is attached to the upper feed / lower feed switching handle 199. Notches 209, 211, and 213 are formed in the cylindrical portion of the cam 207, as shown in FIG. On the other hand, the pin 215 is installed while being biased by the spring 217, and is engaged with any of the notches 209, 211, and 213.

A concave portion 216 is formed on one end surface of the cam 207 at the outer peripheral position.
Are formed. On the other hand, the roller 218 is attached to the lever member 155 side already described. As the cam 207 rotates, the roller 218 selectively engages with the recess 216.

When the roller 218 engages with the recess 216, the lever member 155 is in the state shown by the chain double-dashed line in FIG. 8, and the clutch mechanism 149 is in the disengaged state. On the other hand, when the roller 218 is disengaged from the recess 216 and pushed up onto one end surface of the cam 207, the lever member 155 is in the state shown by the solid line in FIG. 8 and the clutch mechanism 149 is engaged. It

When the fine feed / rapid feed switching handle 31 is switched to the fine feed side, the lever member 155 always keeps the eighth movement regardless of the operation of the upper feed / lower feed switching handle 199.
The state is shown by the solid line in the figure.

The cam 207 can also be rotated by the action means 112 already described. That is, the link member 223 of the L-shaped link mechanism 221 is connected to the other end of the shaft 121 which has already been described with reference to FIGS. 5 to 7. The link member 225 of the link mechanism 221 is connected to the cam 207.

Therefore, when the shaft 121 rotates, the cam 207 rotates in an appropriate direction via the link mechanism 221.

In this embodiment, as shown in FIG. 4, the moving amount of the quill 21 is digitally displayed on the digital display unit 231.

That is, as shown in FIG. 5 and FIG.
A scale 235 is connected to the 109 via a connecting member 233, and a magnetic change is detected when the scale 235 passes through a measuring mechanism main body (not shown).
The movement amount of 21 is calculated and displayed on the digital display unit 231.

By operating the on / zero switch 237 shown in FIG. 4, zero adjustment can be performed at any position.

Based on the above configuration, the operation in the case of performing the lower feed finishing process by automatically lowering the quill will be described with reference to FIGS. 12 to 14.

First, before starting the machining, in this case,
As shown in Fig. 12 (a), the upper feed / lower feed switching handle
Set 199 to the "neutral" state. That is, the pin 215 is engaged with the notch 211 among the three notches 209, 211, and 213.

In this case, as shown in FIG. 12 (b), the clutch mechanisms 179 and 181 of the rotation transmitting means 160 are both in the disengaged state. Further, since the fine feed / fast-forward handle 31 is switched to the fast-forward side, the lever member 155 is in a horizontal state and the clutch mechanism 149 of the quill raising / lowering unit 62 is also non-engaged as shown in FIG. 12 (c). It is connected.

Further, as shown in FIG. 12 (d), the shaft 111 of the action means 112 is located at the neutral position, and the gear 113 and the gear 95,
The gear 115 and the gear 75 are flush with each other. Further, as shown in FIG. 12 (e), the pin 129 of the working glove 112 is
Is located at an intermediate position with respect to the groove 119.

The position of the gear 75 as the lower feed stopper has already been set.

Next, by selecting the lower feed, the upper feed / lower feed switching handle 199 is switched to the lower feed side, as shown in FIG. 13 (a), in order to automatically perform finishing. by this,
The pin 215 is engaged with the notch 213. Further, the roller 218 attached to the lever member 155 is in a state of being disengaged from the concave portion 216 of the cam 207, so that the lever member 155 is in a rotated state.

By operating the upper feed / lower feed switching handle 199, the clutch mechanism 179 of the rotation transmitting means 160 is connected as shown in FIG. 13 (b), and the quill is shown as shown in FIG. 13 (c). The clutch mechanism 149 of the elevating means 62 is connected. Thereby, the rotation from the spindle 25 side is transmitted and the descent of the quill 21 is started.

Further, by operating the upper feed / lower feed switching handle 199, as shown in FIG. 13 (e), the shaft 111 of the action means 112 is raised by a predetermined amount via the pin 129 and the groove 119, and As a result, the gear 115 is raised by a predetermined amount with respect to the gear 75.

Then, as the quill 21 descends, the workpiece is subjected to predetermined processing.

The top member 109 also descends as the quill 21 descends, and contacts the gear 115 immediately before the end of processing. And gear 1
15 As a result, the shaft 111 is lowered and further lowered. This is the state shown in FIG. 14 (d).

By the descending operation of the shaft 111, the cam 207 is rotated clockwise by the operating means 112 as shown in FIG. 14 (a), and the upper feed / lower feed switching handle 199 is returned to "neutral". The rotation of the cam 207 causes the 14th
As shown in FIG. 6B, the clutch mechanism 179 of the rotation transmission means 160 gradually separates.

At this time, as shown in FIG. 14 (c), the lever member 155
However, the clutch mechanism 149 of the quill lifting / lowering means 62 is still engaged.

Then, the quill 21 further descends, collides with the gear 75 as a stopper, and presses it. Then the processing is completed. This is the state shown in FIG. 14 (e). Then, at this time, the cam 207 is returned to the “neutral” state by being assisted by the spring force of the spring 217.

Further, the clutch mechanism 179 of the rotation transmission means 160 is also the cam
By returning 207, it is separated from the spindle 2
Transmission of rotation on the 5 side stops. In addition, quill lifting means 6
The second clutch mechanism 149 is also separated.

At that time, even if the clutch mechanism 179 of the rotation transmitting means 160 is not separated and the rotation transmission is not stopped or the stop timing is delayed, the shaft of the clutch mechanism 149 may be lost. Since the annular member 139 and the annular member 143 slide while compressing the spring 147, the clutch mechanism 149 is reliably separated from each other, and thus no overload is applied.

The above operation is the same when the upper feed is automatically performed. That is, in this case, while setting the gear 95 as the upper feed stopper at a predetermined position, the upper feed /
The lower feed switching handle 199 is switched to the upper feed side.

As a result, the shaft 111 is lowered by a predetermined amount via the action means 112, and the gear 113 is projected downward by a predetermined amount with respect to the gear 95.

Thereafter, as the quill 21 rises, the top member 109 rises and collides with the gear 113, thereby returning the upper feed / lower feed switching handle 199 to the “neutral” position via the action means 112, Further, it collides with the gear 95 serving as a stopper, and the descent is stopped by "crashing stop".

According to this embodiment, the following effects can be obtained.

First, the processing accuracy can be improved. this is,
This is because the top member 109 attached to the quill 21 collides with the gear 75 or 95 serving as a stopper to complete the processing, that is, "stop by hitting".

Also, the effect of overload at that time is completely prevented. That is, the positioning is completed when the top member 109 collides with the gear 75 or 95 as a stopper by the action of the cam 207. At this time, the clutch mechanism 179 is connected, but the coil spring 217 causes the cam 207 to rotate and return to "neutral", whereby the clutch mechanism 179 is disengaged and transmission of rotation from the spindle 25 side is interrupted. Because I am doing it.

Further, even if the rotation transmission is not normally interrupted, the spring 147 in the clutch mechanism 149 is compressed, so that the clutch mechanism 149 is compressed.
Since it breaks, there is no overload.

In the case of the present embodiment, not only downward feed but also upward feed is possible, so that it is possible to effectively cope with diversification of machining.

The present invention is not limited to the above-mentioned one embodiment.

The quill lifting means, the rotation transmission means, and the like may have various configurations other than those shown in the drawings.

Further, it is similarly applicable to the case where only the lower feed is performed.

(Effects of the Invention) As described above in detail, according to the vertical milling machine of the present invention, the operation of the quill is surely stopped by the so-called "collision stop", so that high machining accuracy can be provided. .

Further, since the transmission of rotation is stopped when the top member collides with the stopper, it is possible to prevent the action of overload.

Even if the rotation transmission is not stopped normally, the clutch mechanism can be disengaged by the elastic deformation of the elastic means of the quill lifting means, so that there is no overload.

Further, since the same configuration is adopted not only in the case of the downward feed but also in the case of the upward feed, it is possible to effectively cope with the diversification of machining.

[Brief description of drawings]

1 to 14 are views showing an embodiment of the present invention. FIG. 1 is a front view of a vertical milling machine, FIG. 2 is a side view of the vertical milling machine, and FIG. 4 and 5 are front views of the main shaft portion, FIGS. 5 and 6 are front views showing the main shaft portion by cutting out, FIG. 7 is a sectional view taken along line VII-VII of FIG. 4, and FIG. 9 is a sectional view taken along line VIII-VIII in FIG. 9, FIG. 9 is a sectional view taken along line IX-IX in FIG. 4, FIG. 10 is a sectional view taken along line XX in FIG. 4, and FIG. 11 is a sectional view taken along line XI-XI in FIG. Figures 12 (a) to (e) are top feeds.
Sectional views showing the state of each part when the lower feed switching handle is set to "neutral", and Figs. 13 (a) to (e) show the respective parts when the upper feed / lower feed switching handle is set to "down feed". 14A to 14F are sectional views showing the state, and FIG. 14A to FIG. 14F are sectional views showing the state of each part until the lower feed processing is completed. 1 ... Base, 3 ... Column, 5 ... Knee, 9 ... Saddle, 13 ... Table, 19 ... Main spindle, 21 ... Quill, 25
...... Spindle, 62 ...... quill lifting means, 75 ...... gear (lower feed stopper), 109 ...... top member, 112 …… acting means, 149 ・ ・ ・ quill lifting means clutch mechanism, 160 …… rotation transmitting means, 155 ... Lever member, 179,181 ... Rotation transmission means clutch mechanism, 199 ... Upfeed / downfeed switching handle (operation handle), 207 ... Cam.

Claims (3)

[Claims] 1. A base, a column mounted on the base, and a saddle arranged on the base in front of the column and vertically reciprocating along a guide surface of the column. A table mounted on the saddle and reciprocating in a horizontal direction orthogonal to the reciprocating direction of the saddle to hold a workpiece, and a main shaft portion mounted on an upper end portion of the column,
A quill that is reciprocally moved in the vertical direction and includes a spindle that is attached to the main shaft section and that detachably holds a cutter; a quill raising and lowering unit that raises and lowers the quill; And a rotation transmitting means having a clutch mechanism, a lower feed stopper arranged on the front side of the main shaft portion so as to be able to move up and down, and a lifting member that is attached to the quill and moves up and down as the quill moves up and down. An operation handle which is attached to the main shaft portion and which is provided with a cam member and which rotates the cam member in one direction from a neutral state to put a clutch mechanism of the rotation transmitting means into a state capable of downward feeding; By operating the handle to rotate the cam member in one direction from the neutral state, the rotation transmission hand When the lower feed processing is performed by transmitting the rotation to the quill raising and lowering means by inserting the clutch mechanism, the cam member is rotated in the other direction to return to the neutral state by the collision with the lower feed stopper of the top member. An action means for disengaging the clutch mechanism of the rotation transmission means,
A vertical milling machine equipped with. 2. The vertical milling machine according to claim 1,
A vertical milling machine, wherein the quill lifting means is provided with a clutch mechanism and elastic means, and the clutch mechanism is disengaged by elastically deforming the elastic means in an arbitrary direction. 3. The vertical milling machine according to claim 1,
An upper feed stopper is arranged so as to be able to move up and down on the front side of the main shaft portion and above the lower feed stopper,
The operation handle rotates the cam member in one direction from the neutral state so that the clutch mechanism of the rotation transmitting means is inserted to enable the downward feed and the cam member is rotated in the other direction from the neutral state. The clutch mechanism of the rotation transmitting means is put in by this to make the upper feed possible state, and the operating means operates the operating handle to rotate the cam member in the other direction from the neutral state. When the clutch mechanism of the rotation transmitting means is inserted and the rotation is transmitted to the quill raising and lowering means to perform the upper feed processing, the cam member is rotated in one direction by a collision with the upper feed stopper of the top member, and the cam member is in a neutral state. Vertical milling machine, characterized in that the clutch mechanism of the rotation transmitting means is disengaged thereby.