JPH0615832U - Pressing device for upper roll in roll feeder - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pressing device for an upper roll in a roll feeder that can perform high-precision press working using a material without a pin hole for inserting a pilot pin. [Structure] A yoke 5 rotatably supporting an upper roll on a machine frame 1 is urged downward by a spring 13 of a spring rod 10, and a material is sandwiched between upper and lower rolls for feeding. In the roll feeder 40 for feeding, a spring 33 is mounted between the lifter 24 and the yoke 5 which move up and down by the pilot release cam 16 attached to the drive shaft 15 which rotates in synchronization with the crankshaft, and during feeding of the material. A pressing device for the upper roll in the roll feeder 40, characterized in that the pressing force of the upper roll is changed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressing device that presses an upper roll against a lower roll in a roll feeder that intermittently feeds a material to a press by a predetermined length.

[0002]

[Prior art]

 The upper roll pressing device in the conventional roll feeder rotatably supports the upper roll, and the yoke pivotally supported by the machine frame is biased by the spring of the spring rod to synchronize the upper roll with the crankshaft of the press. It was designed to press against a rotating lower roll and sandwich and feed the material between the upper and lower rolls.

[0003]

[Problems to be solved by the device]

 A roll feeder that feeds material by sandwiching it with upper and lower rolls is suitable for supplying material to a high-speed press machine because the roll is rotating, but the roll repeats intermittent rotation with sudden rotation and sudden stop. Therefore, it is unavoidable that the feed amount of the material for the predetermined length varies by about ± 0,05 mm.

However, since pressed products are required to have a high precision of ± 0,01 mm or less, conventionally, a pin-shaped material in which pin holes are formed at equal intervals on both sides of a tape-shaped material is used. , The material is free by pushing up the yoke with the lifter that moves up and down by the pilot release cam that rotates in synchronization with the crankshaft, and then insert the pilot pin provided in the upper die into the pin hole of the material to make the fixed length. After the position of the fed material was corrected, it was pressed.

When using a pin-hole material, the pin-hole portions on both sides of the material must be discarded after pressing. In general, since press work is cheap, high precision and improvement of material yield have been major issues for profit.

This invention solves the above-mentioned problem, and an object of the present invention is to provide a pressing device for an upper roll in a roll feeder that enables high-precision press working by using a material without pin holes. To do.

[0007]

[Means for Solving the Problems]

 In the upper roll pressing device according to the present invention, the yoke, which rotatably supports the upper roll and is swingably supported by the machine frame, is urged downward by the spring of the spring rod to lower the upper roll. In a roll feeder that presses against a roll and feeds by sandwiching the material with a lower roll, between the lifter that moves up and down by a pilot release cam attached to the drive shaft that rotates in synchronization with the crankshaft and the yoke. It is characterized by the fact that a spring is attached to it.

[0008]

[Action]

 In the pressing device for the upper roll according to the present invention, at the beginning of feeding the material, the upper roll is pressed firmly against the lower roll by the elastic force of the spring of the spring rod, so that the material is firmly nipped and fed. When the pilot release cam rotates and pushes the lifter upward, the spring mounted between the lifter and the yoke is compressed and the reaction force of the spring on the spring of the spring rod increases and the pressing force of the upper roll increases. become weak. That is, the clamping force for sandwiching the material is controlled so that the start of feeding is strong and the end of feeding is weak.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

A lower roll 3 integral with a shaft 2 rotatably supported by a machine frame 1 is adapted to intermittently rotate in synchronization with a crank shaft, as is known. A yoke 5 is swingably supported on a support shaft 4 provided in the machine frame 1, and an upper roll 7 is rotatably supported by a shaft 6 attached to the yoke 5 via a bear ring 8.

A spring rod 10 having a lower end fitted in a recess 9 on the upper surface of the yoke 5 is loosely fitted in a spring adjuster 11 screwed to the machine frame 1, and a spring mounted between the spring adjuster 11 and the flange portion 12 of the spring rod 10. The upper roll 7 is pressed against the lower roll 3 by the elasticity of 13. The pressing force of the upper roll 7 pressed against the lower roll 3 is adjusted by adjusting the elasticity of the spring 13 by rotating the spring adjuster 11 screwed to the machine frame 1, and the pressing force is optimal according to the material W. .

Reference numeral 15 denotes a drive shaft that rotates in synchronization with the crank shaft, and is rotatably supported by the machine frame 1. A pilot release cam 16 is fixed to the drive shaft 15 by a cup screw 17. The outer shape of the pilot release cam 16 is formed as shown in the cam diagram of FIG. 4 when the top dead center of the crankshaft is 0 ° and the bottom dead center is 180 °.

A cross-shaped cam arm 19 is pivotally attached to an arm shaft 18 provided on the machine frame 1, and a cam follower 21 axially supported at the tip of a lower arm 19 a of the cam arm 19 is a pilot release cam by a tension spring 22. It is in contact with 16.

A lifter 24 is connected to the tip of the right arm 19 of the cam arm 19 via a lifter pin 23, and a push pin 25 planted on the lower side of the lifter 24 is screwed to the tip of the yoke 5 and locked by a nut 27. The release bolt 26 is opposed to the release bolt 26 at a predetermined distance a. This interval a is the interval when the cam diagram of FIG. 4 is 250 ° to 350 °.

A spring support plate 28 is attached to the upper surface of the tip of the yoke with screws 29, and a spring support plate 30 is fixed to the lower surface of the lifter 24 with screws 31. A spring 33 is mounted between the adjusting bolt 32 screwed to the spring supporting plate 28 and the spring supporting plate 30, and after adjusting the elasticity of the spring 33, the nut 34 is locked. The elastic force P _{2 of the} spring 33 is smaller than the elastic force P _{1 of the} spring 13. Reference numeral 35 is a support pin for the spring 33.

Reference numeral 37 is an air cylinder that pushes the yoke 5 upward against the bias of the spring rod 10 and separates the upper roll 7 from the lower roll 3.

The operation of the roll feeder 40 configured as described above will be described based on the cam diagram of FIG.

The lifter 24 rises while the pilot release cam 16 rotating in synchronization with the crankshaft rotates in the range of 350 ° to 80 °, and the distance a between the push pin 25 and the relief bolt 26 becomes smaller. The interval a becomes almost 0 between 80 ° and 150 °. During this time, since the spring 33 is compressed, P ₂ becomes large and P ₁ -P ₂ becomes small, so that the pressing force for pressing the upper roll 7 against the lower roll 3 becomes weak.

Then, the push pin pushes up the relief bolt 26 between 150 ° and 180 ° to separate the upper roll 7 from the lower roll 3 to release the sandwiching of the material W, and then at an interval a between 180 ° and 250 °. Return. A strong pressing force of the upper roll 7 acts on the lower roll 3 at an interval a between 250 ° and 350 °, so that the material W is strongly held.

In the roll feeder 40, the lower roll 3 normally rotates between 270 ° and 90 ° to feed the material W for a predetermined length, so that the material W is strongly pinched at the beginning of feeding and is stopped at the end of feeding. Hold it weakly and feed it. Therefore, if the tip of the delivered material (the part where the product was cut off by the previous press work) is brought into contact with the stopper of the die with stopper (upper die), the material will slip at the end of the feed and the feed amount will decrease. Be constant. For example, it is possible to keep the product size variation within ± 0,01 mm or less by setting the feed amount of the upper and lower rolls to 0 to 0.1 mm and slipping about 0.1 mm at the maximum.

[0021]

[Effect of device]

 As described above, in the roll feeder of the present invention, the pressing force of the upper roll is changed to sandwich and feed the material, so that the feed amount of the material without the pin hole for the predetermined length can be made highly accurate. You can Therefore, it becomes possible to use a material without pin holes for high-precision press working, the material to be discarded can be greatly reduced, and the cost of press working can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a roll feeder showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an enlarged front view of a tip portion of a yoke.

FIG. 4 is an example of a cam diagram of a pilot release cam.

[Explanation of symbols]

 1 Machine frame 3 Lower roll 5 Yoke 7 Upper roll 10 Spring rod 13 Spring 16 Pilot release cam 24 Lifter 33 Spring 40 Roll feeder

Claims (1)

[Scope of utility model registration request] 1. A yoke rotatably supporting an upper roll and pivotally supported by a machine frame is urged downward by a spring of a spring rod, and the upper roll is pressed against the lower roll. In a roll feeder that nips and feeds material with upper and lower rolls, a spring is mounted between a lifter that moves up and down by a pilot release cam attached to a drive shaft that rotates in synchronization with a crankshaft, and the yoke. An upper roll pressing device in a roll feeder characterized by the above.